From 2aecdc803a5455fbc3600734ebfa3a515b4fc709 Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Sat, 24 Aug 2024 21:11:37 +0200
Subject: [PATCH 1/7] create c and cuda dirs

---
 build.rs               | 11 +++++------
 src/{ => c}/hvm.c      |  0
 src/{ => c}/hvm.h      |  0
 src/{ => c}/run.c      |  0
 src/{ => cuda}/hvm.cu  |  0
 src/{ => cuda}/hvm.cuh |  0
 src/{ => cuda}/run.cu  |  0
 src/main.rs            |  8 ++++----
 8 files changed, 9 insertions(+), 10 deletions(-)
 rename src/{ => c}/hvm.c (100%)
 rename src/{ => c}/hvm.h (100%)
 rename src/{ => c}/run.c (100%)
 rename src/{ => cuda}/hvm.cu (100%)
 rename src/{ => cuda}/hvm.cuh (100%)
 rename src/{ => cuda}/run.cu (100%)

diff --git a/build.rs b/build.rs
index dd72c946..b42cb14c 100644
--- a/build.rs
+++ b/build.rs
@@ -2,14 +2,13 @@ fn main() {
   let cores = num_cpus::get();
   let tpcl2 = (cores as f64).log2().floor() as u32;
 
-  println!("cargo:rerun-if-changed=src/run.c");
-  println!("cargo:rerun-if-changed=src/hvm.c");
-  println!("cargo:rerun-if-changed=src/run.cu");
-  println!("cargo:rerun-if-changed=src/hvm.cu");
+  println!("cargo:rerun-if-changed=src/c");
+  println!("cargo:rerun-if-changed=src/cuda");
+
   println!("cargo:rustc-link-arg=-rdynamic");
 
   match cc::Build::new()
-      .file("src/run.c")
+      .file("src/c/run.c")
       .opt_level(3)
       .warnings(false)
       .define("TPC_L2", &*tpcl2.to_string())
@@ -32,7 +31,7 @@ fn main() {
 
     cc::Build::new()
       .cuda(true)
-      .file("src/run.cu")
+      .file("src/cuda/run.cu")
       .define("IO", None)
       .flag("-diag-suppress=177") // variable was declared but never referenced
       .flag("-diag-suppress=550") // variable was set but never used
diff --git a/src/hvm.c b/src/c/hvm.c
similarity index 100%
rename from src/hvm.c
rename to src/c/hvm.c
diff --git a/src/hvm.h b/src/c/hvm.h
similarity index 100%
rename from src/hvm.h
rename to src/c/hvm.h
diff --git a/src/run.c b/src/c/run.c
similarity index 100%
rename from src/run.c
rename to src/c/run.c
diff --git a/src/hvm.cu b/src/cuda/hvm.cu
similarity index 100%
rename from src/hvm.cu
rename to src/cuda/hvm.cu
diff --git a/src/hvm.cuh b/src/cuda/hvm.cuh
similarity index 100%
rename from src/hvm.cuh
rename to src/cuda/hvm.cuh
diff --git a/src/run.cu b/src/cuda/run.cu
similarity index 100%
rename from src/run.cu
rename to src/cuda/run.cu
diff --git a/src/main.rs b/src/main.rs
index dee219ab..6bf320db 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -114,14 +114,14 @@ fn main() {
       let bookb = format!("static const u8 BOOK_BUF[] = {};", bookb);
 
       // Generates the C file
-      let hvm_c = include_str!("hvm.c");
+      let hvm_c = include_str!("c/hvm.c");
       let hvm_c = format!("#define IO\n\n{hvm_c}");
       let hvm_c = hvm_c.replace("///COMPILED_INTERACT_CALL///", &cmp::compile_book(cmp::Target::C, &book));
       let hvm_c = hvm_c.replace("#define INTERPRETED", "#define COMPILED");
       let hvm_c = hvm_c.replace("//COMPILED_BOOK_BUF//", &bookb);
       let hvm_c = hvm_c.replace("#define WITHOUT_MAIN", "#define WITH_MAIN");
       let hvm_c = hvm_c.replace("#define TPC_L2 0", &format!("#define TPC_L2 {} // {} cores", tpcl2, cores));
-      let hvm_c = format!("{hvm_c}\n\n{}", include_str!("run.c"));
+      let hvm_c = format!("{hvm_c}\n\n{}", include_str!("c/run.c"));
       let hvm_c = hvm_c.replace(r#"#include "hvm.c""#, "");
       println!("{}", hvm_c);
     }
@@ -145,11 +145,11 @@ fn main() {
       //let hvm_c = hvm_c.replace("#define INTERPRETED", "#define COMPILED");
       
       // Generates the Cuda file
-      let hvm_cu = include_str!("hvm.cu");
+      let hvm_cu = include_str!("cuda/hvm.cu");
       let hvm_cu = format!("#define IO\n\n{hvm_cu}");
       let hvm_cu = hvm_cu.replace("//COMPILED_BOOK_BUF//", &bookb);
       let hvm_cu = hvm_cu.replace("#define WITHOUT_MAIN", "#define WITH_MAIN");
-      let hvm_cu = format!("{hvm_cu}\n\n{}", include_str!("run.cu"));
+      let hvm_cu = format!("{hvm_cu}\n\n{}", include_str!("cuda/run.cu"));
       let hvm_cu = hvm_cu.replace(r#"#include "hvm.cu""#, "");
       println!("{}", hvm_cu);
     }

From 1271ba29e4eee2d1737385afc830079d0ab6591e Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Sun, 25 Aug 2024 08:18:56 +0200
Subject: [PATCH 2/7] working prototype

---
 src/cuda/alloc.cuh     |  156 +++++
 src/cuda/common.cuh    |   27 +
 src/cuda/config.cuh    |   32 +
 src/cuda/constants.cuh |   16 +
 src/cuda/grid.cuh      |   18 +
 src/cuda/hvm.cu        | 1280 +---------------------------------------
 src/cuda/hvm.cuh       |  219 +------
 src/cuda/pair.cuh      |   18 +
 src/cuda/port/numb.cuh |  252 ++++++++
 src/cuda/port/port.cuh |   51 ++
 src/cuda/rule.cuh      |   26 +
 src/cuda/show.cuh      |  348 +++++++++++
 src/cuda/structs.cuh   |  330 +++++++++++
 src/cuda/types.cuh     |   58 ++
 src/makefile           |    8 +
 15 files changed, 1353 insertions(+), 1486 deletions(-)
 create mode 100644 src/cuda/alloc.cuh
 create mode 100644 src/cuda/common.cuh
 create mode 100644 src/cuda/config.cuh
 create mode 100644 src/cuda/constants.cuh
 create mode 100644 src/cuda/grid.cuh
 create mode 100644 src/cuda/pair.cuh
 create mode 100644 src/cuda/port/numb.cuh
 create mode 100644 src/cuda/port/port.cuh
 create mode 100644 src/cuda/rule.cuh
 create mode 100644 src/cuda/show.cuh
 create mode 100644 src/cuda/structs.cuh
 create mode 100644 src/cuda/types.cuh
 create mode 100644 src/makefile

diff --git a/src/cuda/alloc.cuh b/src/cuda/alloc.cuh
new file mode 100644
index 00000000..0040d2dc
--- /dev/null
+++ b/src/cuda/alloc.cuh
@@ -0,0 +1,156 @@
+#ifndef alloc_cuh_INCLUDED
+#define alloc_cuh_INCLUDED
+
+#include "types.cuh"
+#include "config.cuh"
+#include "grid.cuh"
+#include "structs.cuh"
+#include <stdio.h>
+
+template <typename A>
+__device__ u32 g_alloc_1(Net* net, u32* g_put, A* g_buf) {
+  u32 lps = 0;
+  while (true) {
+    u32 lc = GID()*(G_NODE_LEN/TPG) + (*g_put%(G_NODE_LEN/TPG));
+    A elem = g_buf[lc];
+    *g_put += 1;
+    if (lc >= L_NODE_LEN && elem == 0) {
+      return lc;
+    }
+    if (++lps >= G_NODE_LEN/TPG) printf("OOM\n"); // FIXME: remove
+    //assert(++lps < G_NODE_LEN/TPG); // FIXME: enable?
+  }
+}
+
+template <typename A>
+__device__ u32 g_alloc(Net* net, u32* ret, u32* g_put, A* g_buf, u32 num) {
+  u32 got = 0;
+  u32 lps = 0;
+  while (got < num) {
+    u32 lc = GID()*(G_NODE_LEN/TPG) + (*g_put%(G_NODE_LEN/TPG));
+    A elem = g_buf[lc];
+    *g_put += 1;
+    if (lc >= L_NODE_LEN && elem == 0) {
+      ret[got++] = lc;
+    }
+
+    if (++lps >= G_NODE_LEN/TPG) printf("OOM\n"); // FIXME: remove
+    //assert(++lps < G_NODE_LEN/TPG); // FIXME: enable?
+  }
+  return got;
+
+}
+
+template <typename A>
+__device__ u32 l_alloc(Net* net, u32* ret, u32* l_put, A* l_buf, u32 num) {
+  u32 got = 0;
+  u32 lps = 0;
+  while (got < num) {
+    u32 lc = ((*l_put)++ * TPB) % L_NODE_LEN + TID();
+    A elem = l_buf[lc];
+    if (++lps >= L_NODE_LEN/TPB) {
+      break;
+    }
+    if (lc > 0 && elem == 0) {
+      ret[got++] = lc;
+    }
+  }
+  return got;
+}
+
+template <typename A>
+__device__ u32 l_alloc_1(Net* net, u32* ret, u32* l_put, A* l_buf, u32* lps) {
+  u32 got = 0;
+  while (true) {
+    u32 lc = ((*l_put)++ * TPB) % L_NODE_LEN + TID();
+    A elem = l_buf[lc];
+    if (++(*lps) >= L_NODE_LEN/TPB) {
+      break;
+    }
+    if (lc > 0 && elem == 0) {
+      return lc;
+    }
+  }
+  return got;
+}
+
+__device__ u32 g_node_alloc_1(Net* net) {
+  return g_alloc_1(net, net->g_node_put, net->g_node_buf);
+}
+
+__device__ u32 g_vars_alloc_1(Net* net) {
+  return g_alloc_1(net, net->g_vars_put, net->g_vars_buf);
+}
+
+__device__ u32 g_node_alloc(Net* net, TM* tm, u32 num) {
+  return g_alloc(net, tm->nloc, net->g_node_put, net->g_node_buf, num);
+}
+
+__device__ u32 g_vars_alloc(Net* net, TM* tm, u32 num) {
+  return g_alloc(net, tm->vloc, net->g_vars_put, net->g_vars_buf, num);
+}
+
+__device__ u32 l_node_alloc(Net* net, TM* tm, u32 num) {
+  return l_alloc(net, tm->nloc, &tm->nput, net->l_node_buf, num);
+}
+
+__device__ u32 l_vars_alloc(Net* net, TM* tm, u32 num) {
+  return l_alloc(net, tm->vloc, &tm->vput, net->l_vars_buf, num);
+}
+
+__device__ u32 l_node_alloc_1(Net* net, TM* tm, u32* lps) {
+  return l_alloc_1(net, tm->nloc, &tm->nput, net->l_node_buf, lps);
+}
+
+__device__ u32 l_vars_alloc_1(Net* net, TM* tm, u32* lps) {
+  return l_alloc_1(net, tm->vloc, &tm->vput, net->l_vars_buf, lps);
+}
+
+__device__ u32 node_alloc_1(Net* net, TM* tm, u32* lps) {
+  if (tm->mode != WORK) {
+    return g_node_alloc_1(net);
+  } else {
+    return l_node_alloc_1(net, tm, lps);
+  }
+}
+
+__device__ u32 vars_alloc_1(Net* net, TM* tm, u32* lps) {
+  if (tm->mode != WORK) {
+    return g_vars_alloc_1(net);
+  } else {
+    return l_vars_alloc_1(net, tm, lps);
+  }
+}
+
+// Adjusts a newly allocated port.
+__device__ inline Port adjust_port(Net* net, TM* tm, Port port) {
+  Tag tag = get_tag(port);
+  Val val = get_val(port);
+  if (is_nod(port)) return new_port(tag, tm->nloc[val]);
+  if (is_var(port)) return new_port(tag, tm->vloc[val]);
+  return new_port(tag, val);
+}
+
+// Adjusts a newly allocated pair.
+__device__ inline Pair adjust_pair(Net* net, TM* tm, Pair pair) {
+  Port p1 = adjust_port(net, tm, get_fst(pair));
+  Port p2 = adjust_port(net, tm, get_snd(pair));
+  return new_pair(p1, p2);
+}
+
+// Gets the necessary resources for an interaction.
+__device__ bool get_resources(Net* net, TM* tm, u32 need_rbag, u32 need_node, u32 need_vars) {
+  u32 got_rbag = min(RLEN - tm->rbag.lo_end, RLEN - tm->rbag.hi_end);
+  u32 got_node;
+  u32 got_vars;
+  if (tm->mode != WORK) {
+    got_node = g_node_alloc(net, tm, need_node);
+    got_vars = g_vars_alloc(net, tm, need_vars);
+  } else {
+    got_node = l_node_alloc(net, tm, need_node);
+    got_vars = l_vars_alloc(net, tm, need_vars);
+  }
+  return got_rbag >= need_rbag && got_node >= need_node && got_vars >= need_vars;
+}
+
+#endif // alloc_cuh_INCLUDED
diff --git a/src/cuda/common.cuh b/src/cuda/common.cuh
new file mode 100644
index 00000000..2e7dd128
--- /dev/null
+++ b/src/cuda/common.cuh
@@ -0,0 +1,27 @@
+#ifndef common_cuh_INCLUDED
+#define common_cuh_INCLUDED
+
+#include <stdint.h>
+
+typedef  uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef unsigned long long int u64;
+typedef  int32_t i32;
+typedef    float f32;
+typedef   double f64;
+
+// Clamps a float between two values.
+__host__ __device__ inline f32 clamp(f32 x, f32 min, f32 max) {
+  const f32 t = x < min ? min : x;
+  return (t > max) ? max : t;
+}
+
+// TODO: write a time64() function that returns the time as fast as possible as a u64
+__host__ __device__ inline u64 time64() {
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
+}
+
+#endif // common_cuh_INCLUDED
diff --git a/src/cuda/config.cuh b/src/cuda/config.cuh
new file mode 100644
index 00000000..474e7f27
--- /dev/null
+++ b/src/cuda/config.cuh
@@ -0,0 +1,32 @@
+#ifndef config_cuh_INCLUDED
+#define config_cuh_INCLUDED
+
+#include "common.cuh"
+
+// Clocks per Second
+const u64 S = 2520000000;
+
+// Threads per Block
+const u32 TPB_L2 = 7;
+const u32 TPB    = 1 << TPB_L2;
+
+// Blocks per GPU
+const u32 BPG_L2 = 7;
+const u32 BPG    = 1 << BPG_L2;
+
+// Threads per GPU
+const u32 TPG = TPB * BPG;
+
+// Thread Redex Bag Length
+const u32 RLEN = 256;
+
+// Local Net
+const u32 L_NODE_LEN = 0x2000;
+const u32 L_VARS_LEN = 0x2000;
+
+// Global Net
+const u32 G_NODE_LEN = 1 << 29; // max 536m nodes
+const u32 G_VARS_LEN = 1 << 29; // max 536m vars
+const u32 G_RBAG_LEN = TPB * BPG * RLEN * 3; // max 4m redexes
+
+#endif // config_cuh_INCLUDED
diff --git a/src/cuda/constants.cuh b/src/cuda/constants.cuh
new file mode 100644
index 00000000..4357f333
--- /dev/null
+++ b/src/cuda/constants.cuh
@@ -0,0 +1,16 @@
+#ifndef constants_cuh_INCLUDED
+#define constants_cuh_INCLUDED
+
+#include "types.cuh"
+
+// Special Substitution Map Values
+const Port FREE = 0x00000000;
+const Port ROOT = 0xFFFFFFF8;
+const Port NONE = 0xFFFFFFFF;
+
+// Evaluation Modes
+const u8 SEED = 0;
+const u8 GROW = 1;
+const u8 WORK = 2;
+
+#endif // constants_cuh_INCLUDED
diff --git a/src/cuda/grid.cuh b/src/cuda/grid.cuh
new file mode 100644
index 00000000..a8f1d24e
--- /dev/null
+++ b/src/cuda/grid.cuh
@@ -0,0 +1,18 @@
+#ifndef grid_cuh_INCLUDED
+#define grid_cuh_INCLUDED
+
+#include "types.cuh"
+
+__device__ inline u32 TID() {
+  return threadIdx.x;
+}
+
+__device__ inline u32 BID() {
+  return blockIdx.x;
+}
+
+__device__ inline u32 GID() {
+  return TID() + BID() * blockDim.x;
+}
+
+#endif // grid_cuh_INCLUDED
diff --git a/src/cuda/hvm.cu b/src/cuda/hvm.cu
index ffa3401b..b7ed53b8 100644
--- a/src/cuda/hvm.cu
+++ b/src/cuda/hvm.cu
@@ -1,310 +1,13 @@
 #define INTERPRETED
-#define WITHOUT_MAIN
+#define WITH_MAIN
 
-#ifdef DEBUG
-  #define debug(...) printf(__VA_ARGS__)
-#else
-  #define debug(...)
-#endif
+#include "alloc.cuh"
+#include "port/numb.cuh"
+#include "show.cuh"
 
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 
-// Integers
-// --------
-
-typedef  uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef  int32_t i32;
-typedef    float f32;
-typedef   double f64;
-typedef unsigned long long int u64;
-
-// Configuration
-// -------------
-
-// Clocks per Second
-const u64 S = 2520000000;
-
-// Threads per Block
-const u32 TPB_L2 = 7;
-const u32 TPB    = 1 << TPB_L2;
-
-// Blocks per GPU
-const u32 BPG_L2 = 7;
-const u32 BPG    = 1 << BPG_L2;
-
-// Threads per GPU
-const u32 TPG = TPB * BPG;
-
-//#define ALLOC_MODE SHARED
-//#define ALLOC_MODE GLOBAL
-
-// Types
-// -----
-
-// Local Types
-typedef u8  Tag;  // Tag  ::= 3-bit (rounded up to u8)
-typedef u32 Val;  // Val  ::= 29-bit (rounded up to u32)
-typedef u32 Port; // Port ::= Tag + Val (fits a u32)
-typedef u64 Pair; // Pair ::= Port + Port (fits a u64)
-
-// Rules
-typedef u8 Rule; // Rule ::= 3-bit (rounded up to 8)
-
-// Numbs
-typedef u32 Numb; // Numb ::= 29-bit (rounded up to u32)
-
-// Tags
-const Tag VAR = 0x0; // variable
-const Tag REF = 0x1; // reference
-const Tag ERA = 0x2; // eraser
-const Tag NUM = 0x3; // number
-const Tag CON = 0x4; // constructor
-const Tag DUP = 0x5; // duplicator
-const Tag OPR = 0x6; // operator
-const Tag SWI = 0x7; // switch
-
-// Interaction Rule Values
-const Rule LINK = 0x0;
-const Rule CALL = 0x1;
-const Rule VOID = 0x2;
-const Rule ERAS = 0x3;
-const Rule ANNI = 0x4;
-const Rule COMM = 0x5;
-const Rule OPER = 0x6;
-const Rule SWIT = 0x7;
-
-// Constants
-const Port FREE = 0x00000000;
-const Port ROOT = 0xFFFFFFF8;
-const Port NONE = 0xFFFFFFFF;
-
-// Numbers
-const Tag TY_SYM = 0x00;
-const Tag TY_U24 = 0x01;
-const Tag TY_I24 = 0x02;
-const Tag TY_F24 = 0x03;
-const Tag OP_ADD = 0x04;
-const Tag OP_SUB = 0x05;
-const Tag FP_SUB = 0x06;
-const Tag OP_MUL = 0x07;
-const Tag OP_DIV = 0x08;
-const Tag FP_DIV = 0x09;
-const Tag OP_REM = 0x0A;
-const Tag FP_REM = 0x0B;
-const Tag OP_EQ  = 0x0C;
-const Tag OP_NEQ = 0x0D;
-const Tag OP_LT  = 0x0E;
-const Tag OP_GT  = 0x0F;
-const Tag OP_AND = 0x10;
-const Tag OP_OR  = 0x11;
-const Tag OP_XOR = 0x12;
-const Tag OP_SHL = 0x13;
-const Tag FP_SHL = 0x14;
-const Tag OP_SHR = 0x15;
-const Tag FP_SHR = 0x16;
-
-// Evaluation Modes
-const u8 SEED = 0;
-const u8 GROW = 1;
-const u8 WORK = 2;
-
-// Thread Redex Bag Length
-const u32 RLEN = 256;
-
-// Thread Redex Bag
-// It uses the same space to store two stacks:
-// - HI: a high-priotity stack, for shrinking reductions
-// - LO: a low-priority stack, for growing reductions
-struct RBag {
-  u32  hi_end;
-  Pair hi_buf[RLEN];
-  u32  lo_end;
-  Pair lo_buf[RLEN];
-};
-
-// Local Net
-const u32 L_NODE_LEN = 0x2000;
-const u32 L_VARS_LEN = 0x2000;
-struct LNet {
-  Pair node_buf[L_NODE_LEN];
-  Port vars_buf[L_VARS_LEN];
-};
-
-// Global Net
-const u32 G_NODE_LEN = 1 << 29; // max 536m nodes
-const u32 G_VARS_LEN = 1 << 29; // max 536m vars
-const u32 G_RBAG_LEN = TPB * BPG * RLEN * 3; // max 4m redexes
-struct GNet {
-  u32  rbag_use_A; // total rbag redex count (buffer A)
-  u32  rbag_use_B; // total rbag redex count (buffer B)
-  Pair rbag_buf_A[G_RBAG_LEN]; // global redex bag (buffer A)
-  Pair rbag_buf_B[G_RBAG_LEN]; // global redex bag (buffer B)
-  Pair node_buf[G_NODE_LEN]; // global node buffer
-  Port vars_buf[G_VARS_LEN]; // global vars buffer
-  u32  node_put[TPB*BPG];
-  u32  vars_put[TPB*BPG];
-  u32  rbag_pos[TPB*BPG];
-  u8   mode; // evaluation mode (curr)
-  u64  itrs; // interaction count
-  u64  iadd; // interaction count adder
-  u64  leak; // leak count
-  u32  turn; // turn count
-  u8   down; // are we recursing down?
-  u8   rdec; // decrease rpos by 1?
-};
-
-// View Net: includes both GNet and LNet
-struct Net {
-  i32   l_node_dif; // delta node space
-  i32   l_vars_dif; // delta vars space
-  Pair *l_node_buf; // local node buffer values
-  Port *l_vars_buf; // local vars buffer values
-  u32  *g_rbag_use_A; // global rbag count (active buffer)
-  u32  *g_rbag_use_B; // global rbag count (inactive buffer)
-  Pair *g_rbag_buf_A; // global rbag values (active buffer)
-  Pair *g_rbag_buf_B; // global rbag values (inactive buffer)
-  Pair *g_node_buf; // global node buffer values
-  Port *g_vars_buf; // global vars buffer values
-  u32  *g_node_put; // next global node allocation index
-  u32  *g_vars_put; // next global vars allocation index
-};
-
-// Thread Memory
-struct TM {
-  u32  page; // page index
-  u32  nput; // node alloc index
-  u32  vput; // vars alloc index
-  u32  mode; // evaluation mode
-  u32  itrs; // interactions
-  u32  leak; // leaks
-  u32  nloc[L_NODE_LEN/TPB]; // node allocs
-  u32  vloc[L_NODE_LEN/TPB]; // vars allocs
-  RBag rbag; // tmem redex bag
-};
-
-// Top-Level Definition
-struct Def {
-  char name[256];
-  bool safe;
-  u32  rbag_len;
-  u32  node_len;
-  u32  vars_len;
-  Port root;
-  Pair rbag_buf[L_NODE_LEN/TPB];
-  Pair node_buf[L_NODE_LEN/TPB];
-};
-
-typedef struct Book Book;
-
-// A Foreign Function
-typedef struct {
-  char name[256];
-  Port (*func)(GNet*, Port);
-} FFn;
-
-// Book of Definitions
-struct Book {
-  u32 defs_len;
-  Def defs_buf[0x4000];
-  u32 ffns_len;
-  FFn ffns_buf[0x4000];
-};
-
-// Static Book
-__device__ Book BOOK;
-
-// Debugger
-// --------
-
-struct Show {
-  char x[13];
-};
-
-__device__ __host__ void put_u16(char* B, u16 val);
-__device__ __host__ Show show_port(Port port);
-__device__ Show show_rule(Rule rule);
-__device__ void print_rbag(Net* net, TM* tm);
-__device__ __host__ void print_net(Net* net, u32, u32);
-__device__ void pretty_print_numb(Numb word);
-__device__ void pretty_print_port(Net* net, Port port);
-__device__ void pretty_print_rbag(Net* net, RBag* rbag);
-__global__ void print_heatmap(GNet* gnet, u32 turn);
-
-// Utils
-// -----
-
-__device__ __host__ f32 clamp(f32 x, f32 min, f32 max) {
-  const f32 t = x < min ? min : x;
-  return (t > max) ? max : t;
-}
-
-// TODO: write a time64() function that returns the time as fast as possible as a u64
-static inline u64 time64() {
-  struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
-  return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
-}
-
-__device__ inline u32 TID() {
-  return threadIdx.x;
-}
-
-__device__ inline u32 BID() {
-  return blockIdx.x;
-}
-
-__device__ inline u32 GID() {
-  return TID() + BID() * blockDim.x;
-}
-
-__device__ __host__ inline u32 div(u32 a, u32 b) {
-  return (a + b - 1) / b;
-}
-
-__device__ u32 push_index(u32 msk, u32 idx) {
-  return msk | (1U << (31 - idx));
-}
-
-__device__ u32 pop_index(u32* msk) {
-  u32 idx = __clz(*msk);
-  *msk &= ~(1U << (31 - idx));
-  return idx;
-}
-
-// Port: Constructor and Getters
-// -----------------------------
-
-__device__ __host__ inline Port new_port(Tag tag, Val val) {
-  return (val << 3) | tag;
-}
-
-__device__ __host__ inline Tag get_tag(Port port) {
-  return port & 7;
-}
-
-__device__ __host__ inline Val get_val(Port port) {
-  return port >> 3;
-}
-
-// Pair: Constructor and Getters
-// -----------------------------
-
-__device__ __host__ inline Pair new_pair(Port fst, Port snd) {
-  return ((u64)snd << 32) | fst;
-}
-
-__device__ __host__ inline Port get_fst(Pair pair) {
-  return pair & 0xFFFFFFFF;
-}
-
-__device__ __host__ inline Port get_snd(Pair pair) {
-  return pair >> 32;
-}
-
 __device__ __host__ Pair set_par_flag(Pair pair) {
   Port p1 = get_fst(pair);
   Port p2 = get_snd(pair);
@@ -337,11 +40,6 @@ __device__ __host__ bool get_par_flag(Pair pair) {
 // Utils
 // -----
 
-// Swaps two ports.
-__device__ __host__ inline void swap(Port *a, Port *b) {
-  Port x = *a; *a = *b; *b = x;
-}
-
 // Transposes an index over a matrix.
 __device__ u32 transpose(u32 idx, u32 width, u32 height) {
   u32 old_row = idx / width;
@@ -407,633 +105,15 @@ __device__ void block_print(u32 x) {
   __syncthreads();
 }
 
-// Ports / Pairs / Rules
-// ---------------------
-
-// True if this port has a pointer to a node.
-__device__ __host__ inline bool is_nod(Port a) {
-  return get_tag(a) >= CON;
-}
-
-// True if this port is a variable.
-__device__ __host__ inline bool is_var(Port a) {
-  return get_tag(a) == VAR;
-}
-
-// True if this port is a local node/var (that can leak).
-__device__ __host__ inline bool is_local(Port a) {
-  return (is_nod(a) || is_var(a)) && get_val(a) < L_NODE_LEN;
-}
-
-// True if this port is a global node/var (that can be leaked into).
-__device__ __host__ inline bool is_global(Port a) {
-  return (is_nod(a) || is_var(a)) && get_val(a) >= L_NODE_LEN;
-}
-
-// Given two tags, gets their interaction rule. Uses a u64mask lookup table.
-__device__ __host__ inline Rule get_rule(Port A, Port B) {
-  const u64 x = 0b0111111010110110110111101110111010110000111100001111000100000010;
-  const u64 y = 0b0000110000001100000011100000110011111110111111100010111000000000;
-  const u64 z = 0b1111100011111000111100001111000011000000000000000000000000000000;
-  const u64 i = ((u64)get_tag(A) << 3) | (u64)get_tag(B);
-  return (Rule)((x>>i&1) | (y>>i&1)<<1 | (z>>i&1)<<2);
-}
-
-// Same as above, but receiving a pair.
-__device__ __host__ inline Rule get_pair_rule(Pair AB) {
-  return get_rule(get_fst(AB), get_snd(AB));
-}
-
-// Should we swap ports A and B before reducing this rule?
-__device__ __host__ inline bool should_swap(Port A, Port B) {
-  return get_tag(B) < get_tag(A);
-}
-// Gets a rule's priority
-__device__ __host__ inline bool is_high_priority(Rule rule) {
-  return (bool)((0b00011101 >> rule) & 1);
-}
-
-// Adjusts a newly allocated port.
-__device__ inline Port adjust_port(Net* net, TM* tm, Port port) {
-  Tag tag = get_tag(port);
-  Val val = get_val(port);
-  if (is_nod(port)) return new_port(tag, tm->nloc[val]);
-  if (is_var(port)) return new_port(tag, tm->vloc[val]);
-  return new_port(tag, val);
-}
-
-// Adjusts a newly allocated pair.
-__device__ inline Pair adjust_pair(Net* net, TM* tm, Pair pair) {
-  Port p1 = adjust_port(net, tm, get_fst(pair));
-  Port p2 = adjust_port(net, tm, get_snd(pair));
-  return new_pair(p1, p2);
-}
-
-// Words
-// -----
-
-// Constructor and getters for SYM (operation selector)
-__device__ __host__ inline Numb new_sym(u32 val) {
-  return (val << 5) | TY_SYM;
-}
-
-__device__ __host__ inline u32 get_sym(Numb word) {
-  return (word >> 5);
-}
-
-// Constructor and getters for U24 (unsigned 24-bit integer)
-__device__ __host__ inline Numb new_u24(u32 val) {
-  return (val << 5) | TY_U24;
-}
-
-__device__ __host__ inline u32 get_u24(Numb word) {
-  return word >> 5;
-}
-
-// Constructor and getters for I24 (signed 24-bit integer)
-__device__ __host__ inline Numb new_i24(i32 val) {
-  return ((u32)val << 5) | TY_I24;
-}
-
-__device__ __host__ inline i32 get_i24(Numb word) {
-  return ((i32)word) << 3 >> 8;
-}
-
-// Constructor and getters for F24 (24-bit float)
-__device__ __host__ inline Numb new_f24(f32 val) {
-  u32 bits = *(u32*)&val;
-  u32 shifted_bits = bits >> 8;
-  u32 lost_bits = bits & 0xFF;
-  // round ties to even
-  shifted_bits += (!isnan(val)) & ((lost_bits - ((lost_bits >> 7) & !shifted_bits)) >> 7);
-  // ensure NaNs don't become infinities
-  shifted_bits |= isnan(val);
-  return (shifted_bits << 5) | TY_F24;
-}
-
-__device__ __host__ inline f32 get_f24(Numb word) {
-  u32 bits = (word << 3) & 0xFFFFFF00;
-  return *(f32*)&bits;
-}
-
-// Flip flag
-__device__ __host__ inline Tag get_typ(Numb word) {
-  return word & 0x1F;
-}
-
-__device__ __host__ inline bool is_num(Numb word) {
-  return get_typ(word) >= TY_U24 && get_typ(word) <= TY_F24;
-}
-
-__device__ __host__ inline bool is_cast(Numb word) {
-  return get_typ(word) == TY_SYM && get_sym(word) >= TY_U24 && get_sym(word) <= TY_F24;
-}
-
-// Cast a number to another type.
-// The semantics are meant to spiritually resemble rust's numeric casts:
-// - i24 <-> u24: is just reinterpretation of bits
-// - f24  -> i24,
-//   f24  -> u24: casts to the "closest" integer representing this float,
-//                saturating if out of range and 0 if NaN
-// - i24  -> f24,
-//   u24  -> f24: casts to the "closest" float representing this integer.
-__device__ __host__ inline Numb cast(Numb a, Numb b) {
-  if (get_sym(a) == TY_U24 && get_typ(b) == TY_U24) return b;
-  if (get_sym(a) == TY_U24 && get_typ(b) == TY_I24) {
-    // reinterpret bits
-    i32 val = get_i24(b);
-    return new_u24(*(u32*) &val);
-  }
-  if (get_sym(a) == TY_U24 && get_typ(b) == TY_F24) {
-    f32 val = get_f24(b);
-    if (isnan(val)) {
-      return new_u24(0);
-    }
-    return new_u24((u32) clamp(val, 0.0, 16777215));
-  }
-
-  if (get_sym(a) == TY_I24 && get_typ(b) == TY_U24) {
-    // reinterpret bits
-    u32 val = get_u24(b);
-    return new_i24(*(i32*) &val);
-  }
-  if (get_sym(a) == TY_I24 && get_typ(b) == TY_I24) return b;
-  if (get_sym(a) == TY_I24 && get_typ(b) == TY_F24) {
-    f32 val = get_f24(b);
-    if (isnan(val)) {
-      return new_i24(0);
-    }
-    return new_i24((i32) clamp(val, -8388608.0, 8388607.0));
-  }
-
-  if (get_sym(a) == TY_F24 && get_typ(b) == TY_U24) return new_f24((f32) get_u24(b));
-  if (get_sym(a) == TY_F24 && get_typ(b) == TY_I24) return new_f24((f32) get_i24(b));
-  if (get_sym(a) == TY_F24 && get_typ(b) == TY_F24) return b;
-
-  return new_u24(0);
-}
-
-// Partial application
-__device__ __host__ inline Numb partial(Numb a, Numb b) {
-  return (b & ~0x1F) | get_sym(a);
-}
-
-// Operate function
-__device__ __host__ inline Numb operate(Numb a, Numb b) {
-  Tag at = get_typ(a);
-  Tag bt = get_typ(b);
-  if (at == TY_SYM && bt == TY_SYM) {
-    return new_u24(0);
-  }
-  if (is_cast(a) && is_num(b)) {
-    return cast(a, b);
-  }
-  if (is_cast(b) && is_num(a)) {
-    return cast(b, a);
-  }
-  if (at == TY_SYM && bt != TY_SYM) {
-    return partial(a, b);
-  }
-  if (at != TY_SYM && bt == TY_SYM) {
-    return partial(b, a);
-  }
-  if (at >= OP_ADD && bt >= OP_ADD) {
-    return new_u24(0);
-  }
-  if (at < OP_ADD && bt < OP_ADD) {
-    return new_u24(0);
-  }
-  Tag op, ty;
-  Numb swp;
-  if (at >= OP_ADD) {
-    op = at; ty = bt;
-  } else {
-    op = bt; ty = at; swp = a; a = b; b = swp;
-  }
-  switch (ty) {
-    case TY_U24: {
-      u32 av = get_u24(a);
-      u32 bv = get_u24(b);
-      switch (op) {
-        case OP_ADD: return new_u24(av + bv);
-        case OP_SUB: return new_u24(av - bv);
-        case FP_SUB: return new_u24(bv - av);
-        case OP_MUL: return new_u24(av * bv);
-        case OP_DIV: return new_u24(av / bv);
-        case FP_DIV: return new_u24(bv / av);
-        case OP_REM: return new_u24(av % bv);
-        case FP_REM: return new_u24(bv % av);
-        case OP_EQ:  return new_u24(av == bv);
-        case OP_NEQ: return new_u24(av != bv);
-        case OP_LT:  return new_u24(av < bv);
-        case OP_GT:  return new_u24(av > bv);
-        case OP_AND: return new_u24(av & bv);
-        case OP_OR:  return new_u24(av | bv);
-        case OP_XOR: return new_u24(av ^ bv);
-        case OP_SHL: return new_u24(av << (bv & 31));
-        case FP_SHL: return new_u24(bv << (av & 31));
-        case OP_SHR: return new_u24(av >> (bv & 31));
-        case FP_SHR: return new_u24(bv >> (av & 31));
-        default:     return new_u24(0);
-      }
-    }
-    case TY_I24: {
-      i32 av = get_i24(a);
-      i32 bv = get_i24(b);
-      switch (op) {
-        case OP_ADD: return new_i24(av + bv);
-        case OP_SUB: return new_i24(av - bv);
-        case FP_SUB: return new_i24(bv - av);
-        case OP_MUL: return new_i24(av * bv);
-        case OP_DIV: return new_i24(av / bv);
-        case FP_DIV: return new_i24(bv / av);
-        case OP_REM: return new_i24(av % bv);
-        case FP_REM: return new_i24(bv % av);
-        case OP_EQ:  return new_u24(av == bv);
-        case OP_NEQ: return new_u24(av != bv);
-        case OP_LT:  return new_u24(av < bv);
-        case OP_GT:  return new_u24(av > bv);
-        case OP_AND: return new_i24(av & bv);
-        case OP_OR:  return new_i24(av | bv);
-        case OP_XOR: return new_i24(av ^ bv);
-        default:     return new_i24(0);
-      }
-    }
-    case TY_F24: {
-      float av = get_f24(a);
-      float bv = get_f24(b);
-      switch (op) {
-        case OP_ADD: return new_f24(av + bv);
-        case OP_SUB: return new_f24(av - bv);
-        case FP_SUB: return new_f24(bv - av);
-        case OP_MUL: return new_f24(av * bv);
-        case OP_DIV: return new_f24(av / bv);
-        case FP_DIV: return new_f24(bv / av);
-        case OP_REM: return new_f24(fmodf(av, bv));
-        case FP_REM: return new_f24(fmodf(bv, av));
-        case OP_EQ:  return new_u24(av == bv);
-        case OP_NEQ: return new_u24(av != bv);
-        case OP_LT:  return new_u24(av < bv);
-        case OP_GT:  return new_u24(av > bv);
-        case OP_AND: return new_f24(atan2f(av, bv));
-        case OP_OR:  return new_f24(logf(bv) / logf(av));
-        case OP_XOR: return new_f24(powf(av, bv));
-        case OP_SHL: return new_f24(sin(av + bv));
-        case OP_SHR: return new_f24(tan(av + bv));
-        default:     return new_f24(0);
-      }
-    }
-    default: return new_u24(0);
-  }
-}
-
-// RBag
-// ----
-
-__device__ RBag rbag_new() {
-  RBag rbag;
-  rbag.hi_end = 0;
-  rbag.lo_end = 0;
-  return rbag;
-}
-
-__device__ u32 rbag_len(RBag* rbag) {
-  return rbag->hi_end + rbag->lo_end;
-}
-
-__device__ u32 rbag_has_highs(RBag* rbag) {
-  return rbag->hi_end > 0;
-}
-
-__device__ void push_redex(TM* tm, Pair redex) {
-  #ifdef DEBUG
-  bool free_hi = tm->rbag.hi_end < RLEN;
-  bool free_lo = tm->rbag.lo_end < RLEN;
-  if (!free_hi || !free_lo) {
-    debug("push_redex: limited resources, maybe corrupting memory\n");
-  }
-  #endif
-
-  Rule rule = get_pair_rule(redex);
-  if (is_high_priority(rule)) {
-    tm->rbag.hi_buf[tm->rbag.hi_end++] = redex;
-  } else {
-    tm->rbag.lo_buf[tm->rbag.lo_end++] = redex;
-  }
-}
-
-__device__ Pair pop_redex(TM* tm) {
-  if (tm->rbag.hi_end > 0) {
-    return tm->rbag.hi_buf[(--tm->rbag.hi_end) % RLEN];
-  } else if (tm->rbag.lo_end > 0) {
-    return tm->rbag.lo_buf[(--tm->rbag.lo_end) % RLEN];
-  } else {
-    return 0;
-  }
-}
-
-// TM
-// --
-
-__device__ TM tmem_new() {
-  TM tm;
-  tm.rbag = rbag_new();
-  tm.nput = 1;
-  tm.vput = 1;
-  tm.mode = SEED;
-  tm.itrs = 0;
-  tm.leak = 0;
-  return tm;
-}
-
-// Net
-// ----
-
-__device__ Net vnet_new(GNet* gnet, void* smem, u32 turn) {
-  Net net;
-  net.l_node_dif   = 0;
-  net.l_vars_dif   = 0;
-  net.l_node_buf   = smem == NULL ? net.l_node_buf : ((LNet*)smem)->node_buf;
-  net.l_vars_buf   = smem == NULL ? net.l_vars_buf : ((LNet*)smem)->vars_buf;
-  net.g_rbag_use_A = turn % 2 == 0 ? &gnet->rbag_use_A : &gnet->rbag_use_B;
-  net.g_rbag_use_B = turn % 2 == 0 ? &gnet->rbag_use_B : &gnet->rbag_use_A;
-  net.g_rbag_buf_A = turn % 2 == 0 ? gnet->rbag_buf_A : gnet->rbag_buf_B;
-  net.g_rbag_buf_B = turn % 2 == 0 ? gnet->rbag_buf_B : gnet->rbag_buf_A;
-  net.g_node_buf   = gnet->node_buf;
-  net.g_vars_buf   = gnet->vars_buf;
-  net.g_node_put   = &gnet->node_put[GID()];
-  net.g_vars_put   = &gnet->vars_put[GID()];
-  return net;
-}
-
-// Stores a new node on global.
-__device__ inline void node_create(Net* net, u32 loc, Pair val) {
-  Pair old;
-  if (loc < L_NODE_LEN) {
-    net->l_node_dif += 1;
-    old = atomicExch(&net->l_node_buf[loc], val);
-  } else {
-    old = atomicExch(&net->g_node_buf[loc], val);
-  }
-  #ifdef DEBUG
-  if (old != 0) printf("[%04x] ERR NODE_CREATE | %04x\n", GID(), loc);
-  #endif
-}
-
-// Stores a var on global.
-__device__ inline void vars_create(Net* net, u32 var, Port val) {
-  Port old;
-  if (var < L_VARS_LEN) {
-    net->l_vars_dif += 1;
-    old = atomicExch(&net->l_vars_buf[var], val);
-  } else {
-    old = atomicExch(&net->g_vars_buf[var], val);
-  }
-  #ifdef DEBUG
-  if (old != 0) printf("[%04x] ERR VARS_CREATE | %04x\n", GID(), var);
-  #endif
-}
-
-// Reads a node from global.
-__device__ __host__ inline Pair node_load(Net* net, u32 loc) {
-  Pair got;
-  if (loc < L_NODE_LEN) {
-    got = net->l_node_buf[loc];
-  } else {
-    got = net->g_node_buf[loc];
-  }
-  return got;
-}
-
-// Reads a var from global.
-__device__ __host__ inline Port vars_load(Net* net, u32 var) {
-  Port got;
-  if (var < L_VARS_LEN) {
-    got = net->l_vars_buf[var];
-  } else {
-    got = net->g_vars_buf[var];
-  }
-  return got;
-}
-
-// Exchanges a node on global by a value. Returns old.
-__device__ inline Pair node_exchange(Net* net, u32 loc, Pair val) {
-  Pair got = 0;
-  if (loc < L_NODE_LEN) {
-    got = atomicExch(&net->l_node_buf[loc], val);
-  } else {
-    got = atomicExch(&net->g_node_buf[loc], val);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR NODE_EXCHANGE | %04x\n", GID(), loc);
-  #endif
-  return got;
-}
-
-// Exchanges a var on global by a value. Returns old.
-__device__ inline Port vars_exchange(Net* net, u32 var, Port val) {
-  Port got = 0;
-  if (var < L_VARS_LEN) {
-    got = atomicExch(&net->l_vars_buf[var], val);
-  } else {
-    got = atomicExch(&net->g_vars_buf[var], val);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR VARS_EXCHANGE | %04x\n", GID(), var);
-  #endif
-  return got;
-}
-
-// Takes a node.
-__device__ inline Pair node_take(Net* net, u32 loc) {
-  Pair got = 0;
-  if (loc < L_NODE_LEN) {
-    net->l_node_dif -= 1;
-    got = atomicExch(&net->l_node_buf[loc], 0);
-  } else {
-    got = atomicExch(&net->g_node_buf[loc], 0);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR NODE_TAKE | %04x\n", GID(), loc);
-  #endif
-  return got;
-}
-
-// Takes a var.
-__device__ inline Port vars_take(Net* net, u32 var) {
-  Port got = 0;
-  if (var < L_VARS_LEN) {
-    net->l_vars_dif -= 1;
-    got = atomicExch(&net->l_vars_buf[var], 0);
-  } else {
-    got = atomicExch(&net->g_vars_buf[var], 0);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR VARS_TAKE | %04x\n", GID(), var);
-  #endif
-  return got;
-}
-
-// Allocator
-// ---------
-
-template <typename A>
-__device__ u32 g_alloc_1(Net* net, u32* g_put, A* g_buf) {
-  u32 lps = 0;
-  while (true) {
-    u32 lc = GID()*(G_NODE_LEN/TPG) + (*g_put%(G_NODE_LEN/TPG));
-    A elem = g_buf[lc];
-    *g_put += 1;
-    if (lc >= L_NODE_LEN && elem == 0) {
-      return lc;
-    }
-    if (++lps >= G_NODE_LEN/TPG) printf("OOM\n"); // FIXME: remove
-    //assert(++lps < G_NODE_LEN/TPG); // FIXME: enable?
-  }
-}
-
-template <typename A>
-__device__ u32 g_alloc(Net* net, u32* ret, u32* g_put, A* g_buf, u32 num) {
-  u32 got = 0;
-  u32 lps = 0;
-  while (got < num) {
-    u32 lc = GID()*(G_NODE_LEN/TPG) + (*g_put%(G_NODE_LEN/TPG));
-    A elem = g_buf[lc];
-    *g_put += 1;
-    if (lc >= L_NODE_LEN && elem == 0) {
-      ret[got++] = lc;
-    }
-
-    if (++lps >= G_NODE_LEN/TPG) printf("OOM\n"); // FIXME: remove
-    //assert(++lps < G_NODE_LEN/TPG); // FIXME: enable?
-  }
-  return got;
-
-}
-
-template <typename A>
-__device__ u32 l_alloc(Net* net, u32* ret, u32* l_put, A* l_buf, u32 num) {
-  u32 got = 0;
-  u32 lps = 0;
-  while (got < num) {
-    u32 lc = ((*l_put)++ * TPB) % L_NODE_LEN + TID();
-    A elem = l_buf[lc];
-    if (++lps >= L_NODE_LEN/TPB) {
-      break;
-    }
-    if (lc > 0 && elem == 0) {
-      ret[got++] = lc;
-    }
-  }
-  return got;
-}
-
-template <typename A>
-__device__ u32 l_alloc_1(Net* net, u32* ret, u32* l_put, A* l_buf, u32* lps) {
-  u32 got = 0;
-  while (true) {
-    u32 lc = ((*l_put)++ * TPB) % L_NODE_LEN + TID();
-    A elem = l_buf[lc];
-    if (++(*lps) >= L_NODE_LEN/TPB) {
-      break;
-    }
-    if (lc > 0 && elem == 0) {
-      return lc;
-    }
-  }
-  return got;
-}
-
-__device__ u32 g_node_alloc_1(Net* net) {
-  return g_alloc_1(net, net->g_node_put, net->g_node_buf);
-}
-
-__device__ u32 g_vars_alloc_1(Net* net) {
-  return g_alloc_1(net, net->g_vars_put, net->g_vars_buf);
-}
-
-__device__ u32 g_node_alloc(Net* net, TM* tm, u32 num) {
-  return g_alloc(net, tm->nloc, net->g_node_put, net->g_node_buf, num);
-}
-
-__device__ u32 g_vars_alloc(Net* net, TM* tm, u32 num) {
-  return g_alloc(net, tm->vloc, net->g_vars_put, net->g_vars_buf, num);
-}
-
-__device__ u32 l_node_alloc(Net* net, TM* tm, u32 num) {
-  return l_alloc(net, tm->nloc, &tm->nput, net->l_node_buf, num);
-}
-
-__device__ u32 l_vars_alloc(Net* net, TM* tm, u32 num) {
-  return l_alloc(net, tm->vloc, &tm->vput, net->l_vars_buf, num);
-}
-
-__device__ u32 l_node_alloc_1(Net* net, TM* tm, u32* lps) {
-  return l_alloc_1(net, tm->nloc, &tm->nput, net->l_node_buf, lps);
-}
-
-__device__ u32 l_vars_alloc_1(Net* net, TM* tm, u32* lps) {
-  return l_alloc_1(net, tm->vloc, &tm->vput, net->l_vars_buf, lps);
-}
-
-__device__ u32 node_alloc_1(Net* net, TM* tm, u32* lps) {
-  if (tm->mode != WORK) {
-    return g_node_alloc_1(net);
-  } else {
-    return l_node_alloc_1(net, tm, lps);
-  }
-}
-
-__device__ u32 vars_alloc_1(Net* net, TM* tm, u32* lps) {
-  if (tm->mode != WORK) {
-    return g_vars_alloc_1(net);
-  } else {
-    return l_vars_alloc_1(net, tm, lps);
-  }
-}
-
 // Linking
 // -------
 
-// Finds a variable's value.
-__device__ inline Port peek(Net* net, Port var) {
-  while (get_tag(var) == VAR) {
-    Port val = vars_load(net, get_val(var));
-    if (val == NONE) break;
-    if (val == 0) break;
-    var = val;
-  }
-  return var;
-}
-
-// Finds a variable's value.
-__device__ inline Port enter(Net* net, Port var) {
-  u32 lps = 0;
-  Port init = var;
-  // While `B` is VAR: extend it (as an optimization)
-  while (get_tag(var) == VAR) {
-    // Takes the current `var` substitution as `val`
-    Port val = vars_exchange(net, get_val(var), NONE);
-    // If there was no `val`, stop, as there is no extension
-    if (val == NONE) {
-      break;
-    }
-    // Sanity check: if global A is unfilled, stop
-    if (val == 0) {
-      break;
-    }
-    // Otherwise, delete `B` (we own both) and continue
-    vars_take(net, get_val(var));
-    //if (++lps > 65536) printf("[%04x] BUG A | init=%s var=%s val=%s\n", GID(), show_port(init).x, show_port(var).x, show_port(val).x);
-    var = val;
-  }
-  return var;
-}
-
 // Atomically Links `A ~ B`.
 __device__ void link(Net* net, TM* tm, Port A, Port B) {
+  #ifdef DEBUG
   Port INI_A = A;
   Port INI_B = B;
+  #endif
 
   u32 lps = 0;
 
@@ -1102,26 +182,6 @@ __device__ void link_pair(Net* net, TM* tm, Pair AB) {
   link(net, tm, get_fst(AB), get_snd(AB));
 }
 
-// Resources
-// ---------
-
-// Gets the necessary resources for an interaction.
-__device__ bool get_resources(Net* net, TM* tm, u32 need_rbag, u32 need_node, u32 need_vars) {
-  u32 got_rbag = min(RLEN - tm->rbag.lo_end, RLEN - tm->rbag.hi_end);
-  u32 got_node;
-  u32 got_vars;
-  if (tm->mode != WORK) {
-    debug("allocating need_rbag=%u need_node=%u need_vars=%u\n", need_rbag, need_node, need_vars);
-
-    got_node = g_node_alloc(net, tm, need_node);
-    got_vars = g_vars_alloc(net, tm, need_vars);
-  } else {
-    got_node = l_node_alloc(net, tm, need_node);
-    got_vars = l_vars_alloc(net, tm, need_vars);
-  }
-  return got_rbag >= need_rbag && got_node >= need_node && got_vars >= need_vars;
-}
-
 // Interactions
 // ------------
 
@@ -1944,290 +1004,6 @@ bool book_load(Book* book, u32* buf) {
   return true;
 }
 
-// Debug Printing
-// --------------
-
-__device__ __host__ void put_u32(char* B, u32 val) {
-  for (int i = 0; i < 8; i++, val >>= 4) {
-    B[8-i-1] = "0123456789ABCDEF"[val & 0xF];
-  }
-}
-
-__device__ __host__ Show show_port(Port port) {
-  // NOTE: this is done like that because sprintf seems not to be working
-  Show s;
-  switch (get_tag(port)) {
-    case VAR: memcpy(s.x, "VAR:", 4); put_u32(s.x+4, get_val(port)); break;
-    case REF: memcpy(s.x, "REF:", 4); put_u32(s.x+4, get_val(port)); break;
-    case ERA: memcpy(s.x, "ERA:________", 12); break;
-    case NUM: memcpy(s.x, "NUM:", 4); put_u32(s.x+4, get_val(port)); break;
-    case CON: memcpy(s.x, "CON:", 4); put_u32(s.x+4, get_val(port)); break;
-    case DUP: memcpy(s.x, "DUP:", 4); put_u32(s.x+4, get_val(port)); break;
-    case OPR: memcpy(s.x, "OPR:", 4); put_u32(s.x+4, get_val(port)); break;
-    case SWI: memcpy(s.x, "SWI:", 4); put_u32(s.x+4, get_val(port)); break;
-  }
-  s.x[12] = '\0';
-  return s;
-}
-
-__device__ Show show_rule(Rule rule) {
-  Show s;
-  switch (rule) {
-    case LINK: memcpy(s.x, "LINK", 4); break;
-    case VOID: memcpy(s.x, "VOID", 4); break;
-    case ERAS: memcpy(s.x, "ERAS", 4); break;
-    case ANNI: memcpy(s.x, "ANNI", 4); break;
-    case COMM: memcpy(s.x, "COMM", 4); break;
-    case OPER: memcpy(s.x, "OPER", 4); break;
-    case SWIT: memcpy(s.x, "SWIT", 4); break;
-    case CALL: memcpy(s.x, "CALL", 4); break;
-    default  : memcpy(s.x, "????", 4); break;
-  }
-  s.x[4] = '\0';
-  return s;
-}
-
-__device__ void print_rbag(Net* net, TM* tm) {
-  printf("RBAG | FST-TREE     | SND-TREE    \n");
-  printf("---- | ------------ | ------------\n");
-  for (u32 i = 0; i < tm->rbag.hi_end; ++i) {
-    Pair redex = tm->rbag.hi_buf[i];
-    Pair node1 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_fst(redex))) : 0;
-    Pair node2 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_snd(redex))) : 0;
-    printf("%04X | %s | %s | hi | (%s %s) ~ (%s %s)\n", i,
-      show_port(get_fst(redex)).x,
-      show_port(get_snd(redex)).x,
-      show_port(peek(net, get_fst(node1))).x,
-      show_port(peek(net, get_snd(node1))).x,
-      show_port(peek(net, get_fst(node2))).x,
-      show_port(peek(net, get_snd(node2))).x);
-  }
-  for (u32 i = 0; i < tm->rbag.lo_end; ++i) {
-    Pair redex = tm->rbag.lo_buf[i%RLEN];
-    Pair node1 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_fst(redex))) : 0;
-    Pair node2 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_snd(redex))) : 0;
-    printf("%04X | %s | %s | hi | (%s %s) ~ (%s %s)\n", i,
-      show_port(get_fst(redex)).x,
-      show_port(get_snd(redex)).x,
-      show_port(peek(net, get_fst(node1))).x,
-      show_port(peek(net, get_snd(node1))).x,
-      show_port(peek(net, get_fst(node2))).x,
-      show_port(peek(net, get_snd(node2))).x);
-  }
-  printf("==== | ============ | ============\n");
-}
-
-__device__ __host__ void print_net(Net* net, u32 ini, u32 end) {
-  printf("NODE | PORT-1       | PORT-2      \n");
-  printf("---- | ------------ | ------------\n");
-  for (u32 i = ini; i < end; ++i) {
-    Pair node = node_load(net, i);
-    if (node != 0) {
-      printf("%04X | %s | %s\n", i, show_port(get_fst(node)).x, show_port(get_snd(node)).x);
-    }
-  }
-  printf("==== | ============ |\n");
-  printf("VARS | VALUE        |\n");
-  printf("---- | ------------ |\n");
-  for (u32 i = ini; i < end; ++i) {
-    Port var = vars_load(net,i);
-    if (var != 0) {
-      printf("%04X | %s |\n", i, show_port(vars_load(net,i)).x);
-    }
-  }
-  printf("==== | ============ |\n");
-}
-
-__device__ void pretty_print_numb(Numb word) {
-  switch (get_typ(word)) {
-    case TY_SYM: {
-      switch (get_sym(word)) {
-        // types
-        case TY_U24: printf("[u24]"); break;
-        case TY_I24: printf("[i24]"); break;
-        case TY_F24: printf("[f24]"); break;
-        // operations
-        case OP_ADD: printf("[+]"); break;
-        case OP_SUB: printf("[-]"); break;
-        case FP_SUB: printf("[:-]"); break;
-        case OP_MUL: printf("[*]"); break;
-        case OP_DIV: printf("[/]"); break;
-        case FP_DIV: printf("[:/]"); break;
-        case OP_REM: printf("[%%]"); break;
-        case FP_REM: printf("[:%%]"); break;
-        case OP_EQ:  printf("[=]"); break;
-        case OP_NEQ: printf("[!]"); break;
-        case OP_LT:  printf("[<]"); break;
-        case OP_GT:  printf("[>]"); break;
-        case OP_AND: printf("[&]"); break;
-        case OP_OR:  printf("[|]"); break;
-        case OP_XOR: printf("[^]"); break;
-        case OP_SHL: printf("[<<]"); break;
-        case FP_SHL: printf("[:<<]"); break;
-        case OP_SHR: printf("[>>]"); break;
-        case FP_SHR: printf("[:>>]"); break;
-        default:     printf("[?]"); break;
-      }
-      break;
-    }
-    case TY_U24: {
-      printf("%u", get_u24(word));
-      break;
-    }
-    case TY_I24: {
-      printf("%+d", get_i24(word));
-      break;
-    }
-    case TY_F24: {
-      if (isinf(get_f24(word))) {
-        if (signbit(get_f24(word))) {
-          printf("-inf");
-        } else {
-          printf("+inf");
-        }
-      } else if (isnan(get_f24(word))) {
-        printf("+NaN");
-      } else {
-        printf("%.7e", get_f24(word));
-      }
-      break;
-    }
-    default: {
-      switch (get_typ(word)) {
-        case OP_ADD: printf("[+0x%07X]", get_u24(word)); break;
-        case OP_SUB: printf("[-0x%07X]", get_u24(word)); break;
-        case FP_SUB: printf("[:-0x%07X]", get_u24(word)); break;
-        case OP_MUL: printf("[*0x%07X]", get_u24(word)); break;
-        case OP_DIV: printf("[/0x%07X]", get_u24(word)); break;
-        case FP_DIV: printf("[:/0x%07X]", get_u24(word)); break;
-        case OP_REM: printf("[%%0x%07X]", get_u24(word)); break;
-        case FP_REM: printf("[:%%0x%07X]", get_u24(word)); break;
-        case OP_EQ:  printf("[=0x%07X]", get_u24(word)); break;
-        case OP_NEQ: printf("[!0x%07X]", get_u24(word)); break;
-        case OP_LT:  printf("[<0x%07X]", get_u24(word)); break;
-        case OP_GT:  printf("[>0x%07X]", get_u24(word)); break;
-        case OP_AND: printf("[&0x%07X]", get_u24(word)); break;
-        case OP_OR:  printf("[|0x%07X]", get_u24(word)); break;
-        case OP_XOR: printf("[^0x%07X]", get_u24(word)); break;
-        case OP_SHL: printf("[<<0x%07X]", get_u24(word)); break;
-        case FP_SHL: printf("[:<<0x%07X]", get_u24(word)); break;
-        case OP_SHR: printf("[>>0x%07X]", get_u24(word)); break;
-        case FP_SHR: printf("[:>>0x%07X]", get_u24(word)); break;
-        default:     printf("[?0x%07X]", get_u24(word)); break;
-      }
-      break;
-    }
-  }
-}
-
-__device__ void pretty_print_port(Net* net, Port port) {
-  Port stack[4096];
-  stack[0] = port;
-  u32 len = 1;
-  while (len > 0) {
-    if (len > 256) {
-      printf("ERROR: result too deep to print. This will be fixed soon(TM)");
-      --len;
-      continue;
-    }
-    Port cur = stack[--len];
-    switch (get_tag(cur)) {
-      case CON: {
-        Pair node = node_load(net,get_val(cur));
-        Port p2   = get_snd(node);
-        Port p1   = get_fst(node);
-        printf("(");
-        stack[len++] = new_port(ERA, (u32)(')'));
-        stack[len++] = p2;
-        stack[len++] = new_port(ERA, (u32)(' '));
-        stack[len++] = p1;
-        break;
-      }
-      case ERA: {
-        if (get_val(cur) != 0) {
-          printf("%c", (char)get_val(cur));
-        } else {
-          printf("*");
-        }
-        break;
-      }
-      case VAR: {
-        Port got = vars_load(net, get_val(cur));
-        if (got != NONE) {
-          stack[len++] = got;
-        } else {
-          printf("x%x", get_val(cur));
-        }
-        break;
-      }
-      case NUM: {
-        pretty_print_numb(get_val(cur));
-        break;
-      }
-      case DUP: {
-        Pair node = node_load(net,get_val(cur));
-        Port p2   = get_snd(node);
-        Port p1   = get_fst(node);
-        printf("{");
-        stack[len++] = new_port(ERA, (u32)('}'));
-        stack[len++] = p2;
-        stack[len++] = new_port(ERA, (u32)(' '));
-        stack[len++] = p1;
-        break;
-      }
-      case OPR: {
-        Pair node = node_load(net,get_val(cur));
-        Port p2   = get_snd(node);
-        Port p1   = get_fst(node);
-        printf("$(");
-        stack[len++] = new_port(ERA, (u32)(')'));
-        stack[len++] = p2;
-        stack[len++] = new_port(ERA, (u32)(' '));
-        stack[len++] = p1;
-        break;
-      }
-      case SWI: {
-        Pair node = node_load(net,get_val(cur));
-        Port p2   = get_snd(node);
-        Port p1   = get_fst(node);
-        printf("?(");
-        stack[len++] = new_port(ERA, (u32)(')'));
-        stack[len++] = p2;
-        stack[len++] = new_port(ERA, (u32)(' '));
-        stack[len++] = p1;
-        break;
-      }
-      case REF: {
-        u32  fid = get_val(cur) & 0xFFFFFFF;
-        Def* def = &BOOK.defs_buf[fid];
-        printf("@%s", def->name);
-        break;
-      }
-    }
-  }
-}
-
-__device__ void pretty_print_rbag(Net* net, RBag* rbag) {
-  for (u32 i = 0; i < rbag->lo_end; ++i) {
-    Pair redex = rbag->lo_buf[i%RLEN];
-    if (redex != 0) {
-      pretty_print_port(net, get_fst(redex));
-      printf(" ~ ");
-      pretty_print_port(net, get_snd(redex));
-      printf("\n");
-    }
-  }
-  for (u32 i = 0; i < rbag->hi_end; ++i) {
-    Pair redex = rbag->hi_buf[i];
-    if (redex != 0) {
-      pretty_print_port(net, get_fst(redex));
-      printf(" ~ ");
-      pretty_print_port(net, get_snd(redex));
-      printf("\n");
-    }
-  }
-}
-
 __device__ u32 NODE_COUNT;
 __device__ u32 VARS_COUNT;
 
@@ -2254,48 +1030,6 @@ __global__ void count_memory(GNet* gnet) {
   if (TID() == 0) atomicAdd(&VARS_COUNT, block_vars_count);
 }
 
-__global__ void print_heatmap(GNet* gnet, u32 turn) {
-  if (GID() > 0) return;
-
-  const char* heatChars[] = {
-    //" ", ".", ":", ":",
-    //"∴", "⁘", "⁙", "░",
-    //"░", "░", "▒", "▒",
-    //"▒", "▓", "▓", "▓"
-    " ", "1", "2", "3",
-    "4", "5", "6", "7",
-    "8", "9", "A", "B",
-    "C", "D", "E", "F",
-  };
-
-  for (u32 bid = 0; bid < BPG; bid++) {
-    printf("|");
-    for (u32 tid = 0; tid < TPB; tid++) {
-      u32 gid = bid * TPB + tid;
-      u32 len = 0;
-      for (u32 i = 0; i < RLEN; i++) {
-        if ( turn % 2 == 0 && gnet->rbag_buf_A[gid * RLEN + i] != 0
-          || turn % 2 == 1 && gnet->rbag_buf_B[gid * RLEN + i] != 0) {
-          len++;
-        }
-      }
-      u32 pos = gnet->rbag_pos[gid];
-      u32 heat = min(len, 0xF);
-      printf("%s", heatChars[heat]);
-    }
-    printf("|\n");
-  }
-}
-
-__global__ void print_result(GNet* gnet) {
-  Net net = vnet_new(gnet, NULL, gnet->turn);
-  if (threadIdx.x == 0 && blockIdx.x == 0) {
-    printf("Result: ");
-    pretty_print_port(&net, enter(&net, ROOT));
-    printf("\n");
-  }
-}
-
 // Demos
 // -----
 
@@ -2306,7 +1040,7 @@ __global__ void print_result(GNet* gnet) {
   //static const u8 BOOK_BUF[] = {6, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 102, 117, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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   // bitonic_sort 2^20
-  //static const u8 BOOK_BUF[] = {19, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 89, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 12, 0, 0, 0, 65, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 100, 111, 119, 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+  static const u8 BOOK_BUF[] = {19, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 89, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 12, 0, 0, 0, 65, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 100, 111, 119, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0, 15, 0, 0, 0, 44, 0, 0, 0, 20, 0, 0, 0, 28, 0, 0, 0, 113, 0, 0, 0, 121, 0, 0, 0, 0, 0, 0, 0, 36, 0, 0, 0, 8, 0, 0, 0, 16, 0, 0, 0, 8, 0, 0, 0, 52, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 14, 0, 0, 0, 115, 119, 97, 112, 95, 95, 67, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 2, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 8, 0, 0, 0, 20, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 15, 0, 0, 0, 115, 119, 97, 112, 95, 95, 67, 49, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 2, 0, 0, 0, 4, 0, 0, 0, 2, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 20, 0, 0, 0, 8, 0, 0, 0, 28, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 16, 0, 0, 0, 119, 97, 114, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 0, 15, 0, 0, 0, 52, 0, 0, 0, 20, 0, 0, 0, 28, 0, 0, 0, 137, 0, 0, 0, 145, 0, 0, 0, 0, 0, 0, 0, 36, 0, 0, 0, 8, 0, 0, 0, 44, 0, 0, 0, 16, 0, 0, 0, 24, 0, 0, 0, 16, 0, 0, 0, 60, 0, 0, 0, 8, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 17, 0, 0, 0, 119, 97, 114, 112, 95, 95, 67, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 12, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0, 105, 0, 0, 0, 76, 0, 0, 0, 13, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 29, 0, 0, 0, 52, 0, 0, 0, 38, 0, 0, 0, 24, 0, 0, 0, 3, 15, 0, 0, 46, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 62, 0, 0, 0, 40, 0, 0, 0, 3, 18, 0, 0, 70, 0, 0, 0, 16, 0, 0, 0, 32, 0, 0, 0, 32, 0, 0, 0, 84, 0, 0, 0, 24, 0, 0, 0, 92, 0, 0, 0, 8, 0, 0, 0, 40, 0, 0, 0, 18, 0, 0, 0, 119, 97, 114, 112, 95, 95, 67, 49, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 21, 0, 0, 0, 12, 0, 0, 0, 4, 0, 0, 0, 129, 0, 0, 128, 92, 0, 0, 0, 129, 0, 0, 128, 132, 0, 0, 0, 13, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 28, 0, 0, 0, 36, 0, 0, 0, 16, 0, 0, 0, 24, 0, 0, 0, 44, 0, 0, 0, 52, 0, 0, 0, 32, 0, 0, 0, 40, 0, 0, 0, 61, 0, 0, 0, 68, 0, 0, 0, 48, 0, 0, 0, 56, 0, 0, 0, 76, 0, 0, 0, 84, 0, 0, 0, 64, 0, 0, 0, 72, 0, 0, 0, 80, 0, 0, 0, 88, 0, 0, 0, 8, 0, 0, 0, 100, 0, 0, 0, 56, 0, 0, 0, 108, 0, 0, 0, 40, 0, 0, 0, 116, 0, 0, 0, 24, 0, 0, 0, 124, 0, 0, 0, 72, 0, 0, 0, 88, 0, 0, 0, 0, 0, 0, 0, 140, 0, 0, 0, 48, 0, 0, 0, 148, 0, 0, 0, 32, 0, 0, 0, 156, 0, 0, 0, 16, 0, 0, 0, 164, 0, 0, 0, 64, 0, 0, 0, 80, 0, 0, 0};
 
 //COMPILED_BOOK_BUF//
 
diff --git a/src/cuda/hvm.cuh b/src/cuda/hvm.cuh
index 1c07a6c3..b724a2f8 100644
--- a/src/cuda/hvm.cuh
+++ b/src/cuda/hvm.cuh
@@ -1,219 +1,12 @@
 #ifndef hvm_cuh_INCLUDED
 #define hvm_cuh_INCLUDED
 
-#include <math.h>
-#include <stdint.h>
-
-// Types
-// -----
-
-typedef  uint8_t u8;
-typedef uint16_t u16;
-typedef uint32_t u32;
-typedef unsigned long long int u64;
-typedef  int32_t i32;
-typedef    float f32;
-typedef   double f64;
-
-// Local Types
-typedef u8  Tag;  // Tag  ::= 3-bit (rounded up to u8)
-typedef u32 Val;  // Val  ::= 29-bit (rounded up to u32)
-typedef u32 Port; // Port ::= Tag + Val (fits a u32)
-typedef u64 Pair; // Pair ::= Port + Port (fits a u64)
-
-// Numbs
-typedef u32 Numb; // Numb ::= 29-bit (rounded up to u32)
-
-// Tags
-const Tag VAR = 0x0; // variable
-const Tag REF = 0x1; // reference
-const Tag ERA = 0x2; // eraser
-const Tag NUM = 0x3; // number
-const Tag CON = 0x4; // constructor
-const Tag DUP = 0x5; // duplicator
-const Tag OPR = 0x6; // operator
-const Tag SWI = 0x7; // switch
-
-// Numbers
-static const f32 U24_MAX = (f32) (1 << 24) - 1;
-static const f32 U24_MIN = 0.0;
-static const f32 I24_MAX = (f32) (1 << 23) - 1;
-static const f32 I24_MIN = (f32) (i32) ((-1u) << 23);
-const Tag TY_SYM = 0x00;
-const Tag TY_U24 = 0x01;
-const Tag TY_I24 = 0x02;
-const Tag TY_F24 = 0x03;
-const Tag OP_ADD = 0x04;
-const Tag OP_SUB = 0x05;
-const Tag FP_SUB = 0x06;
-const Tag OP_MUL = 0x07;
-const Tag OP_DIV = 0x08;
-const Tag FP_DIV = 0x09;
-const Tag OP_REM = 0x0A;
-const Tag FP_REM = 0x0B;
-const Tag OP_EQ  = 0x0C;
-const Tag OP_NEQ = 0x0D;
-const Tag OP_LT  = 0x0E;
-const Tag OP_GT  = 0x0F;
-const Tag OP_AND = 0x10;
-const Tag OP_OR  = 0x11;
-const Tag OP_XOR = 0x12;
-const Tag OP_SHL = 0x13;
-const Tag FP_SHL = 0x14;
-const Tag OP_SHR = 0x15;
-const Tag FP_SHR = 0x16;
-
-typedef struct GNet GNet;
-
-// Debugger
-// --------
-
-// Port: Constructor and Getters
-// -----------------------------
-
-static inline Port new_port(Tag tag, Val val) {
-  return (val << 3) | tag;
-}
-
-static inline Tag get_tag(Port port) {
-  return port & 7;
-}
-
-static inline Val get_val(Port port) {
-  return port >> 3;
-}
-
-// Pair: Constructor and Getters
-// -----------------------------
-
-static inline const Pair new_pair(Port fst, Port snd) {
-  return ((u64)snd << 32) | fst;
-}
-
-static inline Port get_fst(Pair pair) {
-  return pair & 0xFFFFFFFF;
-}
-
-static inline Port get_snd(Pair pair) {
-  return pair >> 32;
-}
-
-// Utils
-// -----
-
-// Swaps two ports.
-static inline void swap(Port *a, Port *b) {
-  Port x = *a; *a = *b; *b = x;
-}
-
-static inline u32 min(u32 a, u32 b) {
-  return (a < b) ? a : b;
-}
-
-static inline f32 clamp(f32 x, f32 min, f32 max) {
-  const f32 t = x < min ? min : x;
-  return (t > max) ? max : t;
-}
+#include "config.cuh"
+#include "constants.cuh"
+#include "show.cuh"
+#include "structs.cuh"
 
-// Numbs
-// -----
-
-// Constructor and getters for SYM (operation selector)
-static inline Numb new_sym(u32 val) {
-  return (val << 5) | TY_SYM;
-}
-
-static inline u32 get_sym(Numb word) {
-  return (word >> 5);
-}
-
-// Constructor and getters for U24 (unsigned 24-bit integer)
-static inline Numb new_u24(u32 val) {
-  return (val << 5) | TY_U24;
-}
-
-static inline u32 get_u24(Numb word) {
-  return word >> 5;
-}
-
-// Constructor and getters for I24 (signed 24-bit integer)
-static inline Numb new_i24(i32 val) {
-  return ((u32)val << 5) | TY_I24;
-}
-
-static inline i32 get_i24(Numb word) {
-  return ((i32)word) << 3 >> 8;
-}
-
-// Constructor and getters for F24 (24-bit float)
-static inline Numb new_f24(float val) {
-  u32 bits = *(u32*)&val;
-  u32 shifted_bits = bits >> 8;
-  u32 lost_bits = bits & 0xFF;
-  // round ties to even
-  shifted_bits += (!isnan(val)) & ((lost_bits - ((lost_bits >> 7) & !shifted_bits)) >> 7);
-  // ensure NaNs don't become infinities
-  shifted_bits |= isnan(val);
-  return (shifted_bits << 5) | TY_F24;
-}
-
-static inline float get_f24(Numb word) {
-  u32 bits = (word << 3) & 0xFFFFFF00;
-  return *(float*)&bits;
-}
-
-static inline Tag get_typ(Numb word) {
-  return word & 0x1F;
-}
-
-static inline bool is_num(Numb word) {
-  return get_typ(word) >= TY_U24 && get_typ(word) <= TY_F24;
-}
-
-static inline bool is_cast(Numb word) {
-  return get_typ(word) == TY_SYM && get_sym(word) >= TY_U24 && get_sym(word) <= TY_F24;
-}
-
-// Partial application
-static inline Numb partial(Numb a, Numb b) {
-  return (b & ~0x1F) | get_sym(a);
-}
-
-// Readback
-// ---------
-
-// Readback: Tuples
-typedef struct Tup {
-  u32  elem_len;
-  Port elem_buf[8];
-} Tup;
-
-// Reads a tuple of `size` elements from `port`.
-// Tuples are con nodes nested to the right auxilliary port,
-// For example, `(CON a (CON b (CON c)))` is a 3-tuple (a, b, c).
-extern Tup gnet_readback_tup(GNet* gnet, Port port, u32 size);
-
-typedef struct Str {
-  u32  len;
-  char *buf;
-} Str;
-
-// Reads a constructor-encoded string (of length at most 255 characters),
-// into a null-terminated `Str`.
-extern Str gnet_readback_str(GNet* gnet, Port port);
-
-typedef struct Bytes {
-  u32  len;
-  char *buf;
-} Bytes;
-
-// Reads a constructor-encoded string (of length at most 256 characters),
-// into a `Bytes`. The returned `Bytes` is not null terminated.
-extern Bytes gnet_readback_bytes(GNet* net, Port port);
-
-// Creates a construtor-encoded string of arbitrary length from the
-// provided `bytes`. This string can be consumed on the HVM-side. This
-// will return an `ERA` if nodes cannot be allocated.
-extern Port gnet_inject_bytes(GNet* net, Bytes *bytes);
+#include <math.h>
+#include <stdio.h>
 
 #endif // hvm_cuh_INCLUDED
diff --git a/src/cuda/pair.cuh b/src/cuda/pair.cuh
new file mode 100644
index 00000000..42ab1b0c
--- /dev/null
+++ b/src/cuda/pair.cuh
@@ -0,0 +1,18 @@
+#ifndef pair_cuh_INCLUDED
+#define pair_cuh_INCLUDED
+
+#include "types.cuh"
+
+__host__ __device__ inline Pair new_pair(Port fst, Port snd) {
+  return ((u64)snd << 32) | fst;
+}
+
+__host__ __device__ inline Port get_fst(Pair pair) {
+  return pair & 0xFFFFFFFF;
+}
+
+__host__ __device__ inline Port get_snd(Pair pair) {
+  return pair >> 32;
+}
+
+#endif // pair_cuh_INCLUDED
diff --git a/src/cuda/port/numb.cuh b/src/cuda/port/numb.cuh
new file mode 100644
index 00000000..369a8abf
--- /dev/null
+++ b/src/cuda/port/numb.cuh
@@ -0,0 +1,252 @@
+#ifndef port_numb_cuh_INCLUDED
+#define port_numb_cuh_INCLUDED
+
+#include "../types.cuh"
+#include <math.h>
+
+// Numeric Tags (Types and Operations)
+const Tag TY_SYM = 0x00;
+const Tag TY_U24 = 0x01;
+const Tag TY_I24 = 0x02;
+const Tag TY_F24 = 0x03;
+const Tag OP_ADD = 0x04;
+const Tag OP_SUB = 0x05;
+const Tag FP_SUB = 0x06;
+const Tag OP_MUL = 0x07;
+const Tag OP_DIV = 0x08;
+const Tag FP_DIV = 0x09;
+const Tag OP_REM = 0x0A;
+const Tag FP_REM = 0x0B;
+const Tag OP_EQ  = 0x0C;
+const Tag OP_NEQ = 0x0D;
+const Tag OP_LT  = 0x0E;
+const Tag OP_GT  = 0x0F;
+const Tag OP_AND = 0x10;
+const Tag OP_OR  = 0x11;
+const Tag OP_XOR = 0x12;
+const Tag OP_SHL = 0x13;
+const Tag FP_SHL = 0x14;
+const Tag OP_SHR = 0x15;
+const Tag FP_SHR = 0x16;
+
+// Numeric Bounds
+const f32 U24_MAX = (f32) (1 << 24) - 1;
+const f32 U24_MIN = 0.0;
+const f32 I24_MAX = (f32) (1 << 23) - 1;
+const f32 I24_MIN = (f32) (i32) ((-1u) << 23);
+
+// Constructor and getters for SYM (operation selector)
+__host__ __device__ inline Numb new_sym(u32 val) {
+  return (val << 5) | TY_SYM;
+}
+
+__host__ __device__ inline u32 get_sym(Numb word) {
+  return (word >> 5);
+}
+
+// Constructor and getters for U24 (unsigned 24-bit integer)
+__host__ __device__ inline Numb new_u24(u32 val) {
+  return (val << 5) | TY_U24;
+}
+
+__host__ __device__ inline u32 get_u24(Numb word) {
+  return word >> 5;
+}
+
+// Constructor and getters for I24 (signed 24-bit integer)
+__host__ __device__ inline Numb new_i24(i32 val) {
+  return ((u32)val << 5) | TY_I24;
+}
+
+__host__ __device__ inline i32 get_i24(Numb word) {
+  return ((i32)word) << 3 >> 8;
+}
+
+// Constructor and getters for F24 (24-bit float)
+__host__ __device__ inline Numb new_f24(float val) {
+  u32 bits = *(u32*)&val;
+  u32 shifted_bits = bits >> 8;
+  u32 lost_bits = bits & 0xFF;
+  // round ties to even
+  shifted_bits += (!isnan(val)) & ((lost_bits - ((lost_bits >> 7) & !shifted_bits)) >> 7);
+  // ensure NaNs don't become infinities
+  shifted_bits |= isnan(val);
+  return (shifted_bits << 5) | TY_F24;
+}
+
+__host__ __device__ inline float get_f24(Numb word) {
+  u32 bits = (word << 3) & 0xFFFFFF00;
+  return *(float*)&bits;
+}
+
+__host__ __device__ inline Tag get_typ(Numb word) {
+  return word & 0x1F;
+}
+
+__host__ __device__ inline bool is_num(Numb word) {
+  return get_typ(word) >= TY_U24 && get_typ(word) <= TY_F24;
+}
+
+__host__ __device__ inline bool is_cast(Numb word) {
+  return get_typ(word) == TY_SYM && get_sym(word) >= TY_U24 && get_sym(word) <= TY_F24;
+}
+
+// Partial application
+__host__ __device__ inline Numb partial(Numb a, Numb b) {
+  return (b & ~0x1F) | get_sym(a);
+}
+
+// Cast a number to another type.
+// The semantics are meant to spiritually resemble rust's numeric casts:
+// - i24 <-> u24: is just reinterpretation of bits
+// - f24  -> i24,
+//   f24  -> u24: casts to the "closest" integer representing this float,
+//                saturating if out of range and 0 if NaN
+// - i24  -> f24,
+//   u24  -> f24: casts to the "closest" float representing this integer.
+__device__ __host__ inline Numb cast(Numb a, Numb b) {
+  if (get_sym(a) == TY_U24 && get_typ(b) == TY_U24) return b;
+  if (get_sym(a) == TY_U24 && get_typ(b) == TY_I24) {
+    // reinterpret bits
+    i32 val = get_i24(b);
+    return new_u24(*(u32*) &val);
+  }
+  if (get_sym(a) == TY_U24 && get_typ(b) == TY_F24) {
+    f32 val = get_f24(b);
+    if (isnan(val)) {
+      return new_u24(0);
+    }
+    return new_u24((u32) clamp(val, 0.0, 16777215));
+  }
+
+  if (get_sym(a) == TY_I24 && get_typ(b) == TY_U24) {
+    // reinterpret bits
+    u32 val = get_u24(b);
+    return new_i24(*(i32*) &val);
+  }
+  if (get_sym(a) == TY_I24 && get_typ(b) == TY_I24) return b;
+  if (get_sym(a) == TY_I24 && get_typ(b) == TY_F24) {
+    f32 val = get_f24(b);
+    if (isnan(val)) {
+      return new_i24(0);
+    }
+    return new_i24((i32) clamp(val, -8388608.0, 8388607.0));
+  }
+
+  if (get_sym(a) == TY_F24 && get_typ(b) == TY_U24) return new_f24((f32) get_u24(b));
+  if (get_sym(a) == TY_F24 && get_typ(b) == TY_I24) return new_f24((f32) get_i24(b));
+  if (get_sym(a) == TY_F24 && get_typ(b) == TY_F24) return b;
+
+  return new_u24(0);
+}
+
+// Operate function
+__device__ __host__ inline Numb operate(Numb a, Numb b) {
+  Tag at = get_typ(a);
+  Tag bt = get_typ(b);
+  if (at == TY_SYM && bt == TY_SYM) {
+    return new_u24(0);
+  }
+  if (is_cast(a) && is_num(b)) {
+    return cast(a, b);
+  }
+  if (is_cast(b) && is_num(a)) {
+    return cast(b, a);
+  }
+  if (at == TY_SYM && bt != TY_SYM) {
+    return partial(a, b);
+  }
+  if (at != TY_SYM && bt == TY_SYM) {
+    return partial(b, a);
+  }
+  if (at >= OP_ADD && bt >= OP_ADD) {
+    return new_u24(0);
+  }
+  if (at < OP_ADD && bt < OP_ADD) {
+    return new_u24(0);
+  }
+  Tag op, ty;
+  Numb swp;
+  if (at >= OP_ADD) {
+    op = at; ty = bt;
+  } else {
+    op = bt; ty = at; swp = a; a = b; b = swp;
+  }
+  switch (ty) {
+    case TY_U24: {
+      u32 av = get_u24(a);
+      u32 bv = get_u24(b);
+      switch (op) {
+        case OP_ADD: return new_u24(av + bv);
+        case OP_SUB: return new_u24(av - bv);
+        case FP_SUB: return new_u24(bv - av);
+        case OP_MUL: return new_u24(av * bv);
+        case OP_DIV: return new_u24(av / bv);
+        case FP_DIV: return new_u24(bv / av);
+        case OP_REM: return new_u24(av % bv);
+        case FP_REM: return new_u24(bv % av);
+        case OP_EQ:  return new_u24(av == bv);
+        case OP_NEQ: return new_u24(av != bv);
+        case OP_LT:  return new_u24(av < bv);
+        case OP_GT:  return new_u24(av > bv);
+        case OP_AND: return new_u24(av & bv);
+        case OP_OR:  return new_u24(av | bv);
+        case OP_XOR: return new_u24(av ^ bv);
+        case OP_SHL: return new_u24(av << (bv & 31));
+        case FP_SHL: return new_u24(bv << (av & 31));
+        case OP_SHR: return new_u24(av >> (bv & 31));
+        case FP_SHR: return new_u24(bv >> (av & 31));
+        default:     return new_u24(0);
+      }
+    }
+    case TY_I24: {
+      i32 av = get_i24(a);
+      i32 bv = get_i24(b);
+      switch (op) {
+        case OP_ADD: return new_i24(av + bv);
+        case OP_SUB: return new_i24(av - bv);
+        case FP_SUB: return new_i24(bv - av);
+        case OP_MUL: return new_i24(av * bv);
+        case OP_DIV: return new_i24(av / bv);
+        case FP_DIV: return new_i24(bv / av);
+        case OP_REM: return new_i24(av % bv);
+        case FP_REM: return new_i24(bv % av);
+        case OP_EQ:  return new_u24(av == bv);
+        case OP_NEQ: return new_u24(av != bv);
+        case OP_LT:  return new_u24(av < bv);
+        case OP_GT:  return new_u24(av > bv);
+        case OP_AND: return new_i24(av & bv);
+        case OP_OR:  return new_i24(av | bv);
+        case OP_XOR: return new_i24(av ^ bv);
+        default:     return new_i24(0);
+      }
+    }
+    case TY_F24: {
+      float av = get_f24(a);
+      float bv = get_f24(b);
+      switch (op) {
+        case OP_ADD: return new_f24(av + bv);
+        case OP_SUB: return new_f24(av - bv);
+        case FP_SUB: return new_f24(bv - av);
+        case OP_MUL: return new_f24(av * bv);
+        case OP_DIV: return new_f24(av / bv);
+        case FP_DIV: return new_f24(bv / av);
+        case OP_REM: return new_f24(fmodf(av, bv));
+        case FP_REM: return new_f24(fmodf(bv, av));
+        case OP_EQ:  return new_u24(av == bv);
+        case OP_NEQ: return new_u24(av != bv);
+        case OP_LT:  return new_u24(av < bv);
+        case OP_GT:  return new_u24(av > bv);
+        case OP_AND: return new_f24(atan2f(av, bv));
+        case OP_OR:  return new_f24(logf(bv) / logf(av));
+        case OP_XOR: return new_f24(powf(av, bv));
+        case OP_SHL: return new_f24(sin(av + bv));
+        case OP_SHR: return new_f24(tan(av + bv));
+        default:     return new_f24(0);
+      }
+    }
+    default: return new_u24(0);
+  }
+}
+
+#endif // port_numb_cuh_INCLUDED
diff --git a/src/cuda/port/port.cuh b/src/cuda/port/port.cuh
new file mode 100644
index 00000000..afbb8b1d
--- /dev/null
+++ b/src/cuda/port/port.cuh
@@ -0,0 +1,51 @@
+#ifndef port_port_cuh_INCLUDED
+#define port_port_cuh_INCLUDED
+
+#include "../types.cuh"
+#include "../config.cuh"
+
+__host__ __device__ inline Port new_port(Tag tag, Val val) {
+  return (val << 3) | tag;
+}
+
+__host__ __device__ inline Tag get_tag(Port port) {
+  return port & 7;
+}
+
+__host__ __device__ inline Val get_val(Port port) {
+  return port >> 3;
+}
+
+// True if this port has a pointer to a node.
+__device__ __host__ inline bool is_nod(Port a) {
+  return get_tag(a) >= CON;
+}
+
+// True if this port is a variable.
+__device__ __host__ inline bool is_var(Port a) {
+  return get_tag(a) == VAR;
+}
+
+// True if this port is a local node/var (that can leak).
+__device__ __host__ inline bool is_local(Port a) {
+  return (is_nod(a) || is_var(a)) && get_val(a) < L_NODE_LEN;
+}
+
+// True if this port is a global node/var (that can be leaked into).
+__device__ __host__ inline bool is_global(Port a) {
+  return (is_nod(a) || is_var(a)) && get_val(a) >= L_NODE_LEN;
+}
+
+// TODO(enricozb): move swap stuff to some internal file
+
+// Swaps two ports.
+__host__ __device__ inline void swap(Port *a, Port *b) {
+  Port x = *a; *a = *b; *b = x;
+}
+
+// Should we swap ports A and B before reducing this rule?
+__device__ __host__ inline bool should_swap(Port A, Port B) {
+  return get_tag(B) < get_tag(A);
+}
+
+#endif // port_port_cuh_INCLUDED
diff --git a/src/cuda/rule.cuh b/src/cuda/rule.cuh
new file mode 100644
index 00000000..d08cf285
--- /dev/null
+++ b/src/cuda/rule.cuh
@@ -0,0 +1,26 @@
+#ifndef rule_cuh_INCLUDED
+#define rule_cuh_INCLUDED
+
+#include "types.cuh"
+#include "port/port.cuh"
+#include "pair.cuh"
+
+// Given two tags, gets their interaction rule. Uses a u64mask lookup table.
+__device__ __host__ inline Rule get_rule(Port A, Port B) {
+  const u64 x = 0b0111111010110110110111101110111010110000111100001111000100000010;
+  const u64 y = 0b0000110000001100000011100000110011111110111111100010111000000000;
+  const u64 z = 0b1111100011111000111100001111000011000000000000000000000000000000;
+  const u64 i = ((u64)get_tag(A) << 3) | (u64)get_tag(B);
+  return (Rule)((x>>i&1) | (y>>i&1)<<1 | (z>>i&1)<<2);
+}
+
+// Same as above, but receiving a pair.
+__device__ __host__ inline Rule get_pair_rule(Pair AB) {
+  return get_rule(get_fst(AB), get_snd(AB));
+}
+
+__device__ __host__ inline bool is_high_priority(Rule rule) {
+  return (bool)((0b00011101 >> rule) & 1);
+}
+
+#endif // rule_cuh_INCLUDED
diff --git a/src/cuda/show.cuh b/src/cuda/show.cuh
new file mode 100644
index 00000000..01af8cdf
--- /dev/null
+++ b/src/cuda/show.cuh
@@ -0,0 +1,348 @@
+#ifndef show_cuh_INCLUDED
+#define show_cuh_INCLUDED
+
+#include "port/numb.cuh"
+#include "pair.cuh"
+#include "structs.cuh"
+#include <string.h>
+#include <stdio.h>
+
+struct Show {
+  char x[13];
+};
+
+__device__ __host__ Show show_port(Port port);
+__device__ __host__ Show show_rule(Rule rule);
+
+__device__ void print_net(Net* net, u32 start, u32 end);
+__device__ void print_rbag(Net* net, TM* tm);
+__device__ void pretty_print_rbag(Net* net, RBag* rbag);
+__device__ void pretty_print_port(Net* net, Port port);
+__device__ void pretty_print_numb(Numb word);
+
+__global__ void print_heatmap(GNet* gnet, u32 turn);
+
+__device__ __host__ void put_u32(char* B, u32 val) {
+  for (int i = 0; i < 8; i++, val >>= 4) {
+    B[8-i-1] = "0123456789ABCDEF"[val & 0xF];
+  }
+}
+
+__device__ __host__ Show show_port(Port port) {
+  // NOTE: this is done like that because sprintf seems not to be working
+  Show s;
+  switch (get_tag(port)) {
+    case VAR: memcpy(s.x, "VAR:", 4); put_u32(s.x+4, get_val(port)); break;
+    case REF: memcpy(s.x, "REF:", 4); put_u32(s.x+4, get_val(port)); break;
+    case ERA: memcpy(s.x, "ERA:________", 12); break;
+    case NUM: memcpy(s.x, "NUM:", 4); put_u32(s.x+4, get_val(port)); break;
+    case CON: memcpy(s.x, "CON:", 4); put_u32(s.x+4, get_val(port)); break;
+    case DUP: memcpy(s.x, "DUP:", 4); put_u32(s.x+4, get_val(port)); break;
+    case OPR: memcpy(s.x, "OPR:", 4); put_u32(s.x+4, get_val(port)); break;
+    case SWI: memcpy(s.x, "SWI:", 4); put_u32(s.x+4, get_val(port)); break;
+  }
+  s.x[12] = '\0';
+  return s;
+}
+
+__device__ Show show_rule(Rule rule) {
+  Show s;
+  switch (rule) {
+    case LINK: memcpy(s.x, "LINK", 4); break;
+    case VOID: memcpy(s.x, "VOID", 4); break;
+    case ERAS: memcpy(s.x, "ERAS", 4); break;
+    case ANNI: memcpy(s.x, "ANNI", 4); break;
+    case COMM: memcpy(s.x, "COMM", 4); break;
+    case OPER: memcpy(s.x, "OPER", 4); break;
+    case SWIT: memcpy(s.x, "SWIT", 4); break;
+    case CALL: memcpy(s.x, "CALL", 4); break;
+    default  : memcpy(s.x, "????", 4); break;
+  }
+  s.x[4] = '\0';
+  return s;
+}
+
+__device__ void print_rbag(Net* net, TM* tm) {
+  printf("RBAG | FST-TREE     | SND-TREE    \n");
+  printf("---- | ------------ | ------------\n");
+  for (u32 i = 0; i < tm->rbag.hi_end; ++i) {
+    Pair redex = tm->rbag.hi_buf[i];
+    Pair node1 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_fst(redex))) : 0;
+    Pair node2 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_snd(redex))) : 0;
+    printf("%04X | %s | %s | hi | (%s %s) ~ (%s %s)\n", i,
+      show_port(get_fst(redex)).x,
+      show_port(get_snd(redex)).x,
+      show_port(peek(net, get_fst(node1))).x,
+      show_port(peek(net, get_snd(node1))).x,
+      show_port(peek(net, get_fst(node2))).x,
+      show_port(peek(net, get_snd(node2))).x);
+  }
+  for (u32 i = 0; i < tm->rbag.lo_end; ++i) {
+    Pair redex = tm->rbag.lo_buf[i%RLEN];
+    Pair node1 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_fst(redex))) : 0;
+    Pair node2 = get_tag(get_snd(redex)) == CON ? node_load(net, get_val(get_snd(redex))) : 0;
+    printf("%04X | %s | %s | hi | (%s %s) ~ (%s %s)\n", i,
+      show_port(get_fst(redex)).x,
+      show_port(get_snd(redex)).x,
+      show_port(peek(net, get_fst(node1))).x,
+      show_port(peek(net, get_snd(node1))).x,
+      show_port(peek(net, get_fst(node2))).x,
+      show_port(peek(net, get_snd(node2))).x);
+  }
+  printf("==== | ============ | ============\n");
+}
+
+__device__ __host__ void print_net(Net* net, u32 ini, u32 end) {
+  printf("NODE | PORT-1       | PORT-2      \n");
+  printf("---- | ------------ | ------------\n");
+  for (u32 i = ini; i < end; ++i) {
+    Pair node = node_load(net, i);
+    if (node != 0) {
+      printf("%04X | %s | %s\n", i, show_port(get_fst(node)).x, show_port(get_snd(node)).x);
+    }
+  }
+  printf("==== | ============ |\n");
+  printf("VARS | VALUE        |\n");
+  printf("---- | ------------ |\n");
+  for (u32 i = ini; i < end; ++i) {
+    Port var = vars_load(net,i);
+    if (var != 0) {
+      printf("%04X | %s |\n", i, show_port(vars_load(net,i)).x);
+    }
+  }
+  printf("==== | ============ |\n");
+}
+
+__device__ void pretty_print_numb(Numb word) {
+  switch (get_typ(word)) {
+    case TY_SYM: {
+      switch (get_sym(word)) {
+        // types
+        case TY_U24: printf("[u24]"); break;
+        case TY_I24: printf("[i24]"); break;
+        case TY_F24: printf("[f24]"); break;
+        // operations
+        case OP_ADD: printf("[+]"); break;
+        case OP_SUB: printf("[-]"); break;
+        case FP_SUB: printf("[:-]"); break;
+        case OP_MUL: printf("[*]"); break;
+        case OP_DIV: printf("[/]"); break;
+        case FP_DIV: printf("[:/]"); break;
+        case OP_REM: printf("[%%]"); break;
+        case FP_REM: printf("[:%%]"); break;
+        case OP_EQ:  printf("[=]"); break;
+        case OP_NEQ: printf("[!]"); break;
+        case OP_LT:  printf("[<]"); break;
+        case OP_GT:  printf("[>]"); break;
+        case OP_AND: printf("[&]"); break;
+        case OP_OR:  printf("[|]"); break;
+        case OP_XOR: printf("[^]"); break;
+        case OP_SHL: printf("[<<]"); break;
+        case FP_SHL: printf("[:<<]"); break;
+        case OP_SHR: printf("[>>]"); break;
+        case FP_SHR: printf("[:>>]"); break;
+        default:     printf("[?]"); break;
+      }
+      break;
+    }
+    case TY_U24: {
+      printf("%u", get_u24(word));
+      break;
+    }
+    case TY_I24: {
+      printf("%+d", get_i24(word));
+      break;
+    }
+    case TY_F24: {
+      if (isinf(get_f24(word))) {
+        if (signbit(get_f24(word))) {
+          printf("-inf");
+        } else {
+          printf("+inf");
+        }
+      } else if (isnan(get_f24(word))) {
+        printf("+NaN");
+      } else {
+        printf("%.7e", get_f24(word));
+      }
+      break;
+    }
+    default: {
+      switch (get_typ(word)) {
+        case OP_ADD: printf("[+0x%07X]", get_u24(word)); break;
+        case OP_SUB: printf("[-0x%07X]", get_u24(word)); break;
+        case FP_SUB: printf("[:-0x%07X]", get_u24(word)); break;
+        case OP_MUL: printf("[*0x%07X]", get_u24(word)); break;
+        case OP_DIV: printf("[/0x%07X]", get_u24(word)); break;
+        case FP_DIV: printf("[:/0x%07X]", get_u24(word)); break;
+        case OP_REM: printf("[%%0x%07X]", get_u24(word)); break;
+        case FP_REM: printf("[:%%0x%07X]", get_u24(word)); break;
+        case OP_EQ:  printf("[=0x%07X]", get_u24(word)); break;
+        case OP_NEQ: printf("[!0x%07X]", get_u24(word)); break;
+        case OP_LT:  printf("[<0x%07X]", get_u24(word)); break;
+        case OP_GT:  printf("[>0x%07X]", get_u24(word)); break;
+        case OP_AND: printf("[&0x%07X]", get_u24(word)); break;
+        case OP_OR:  printf("[|0x%07X]", get_u24(word)); break;
+        case OP_XOR: printf("[^0x%07X]", get_u24(word)); break;
+        case OP_SHL: printf("[<<0x%07X]", get_u24(word)); break;
+        case FP_SHL: printf("[:<<0x%07X]", get_u24(word)); break;
+        case OP_SHR: printf("[>>0x%07X]", get_u24(word)); break;
+        case FP_SHR: printf("[:>>0x%07X]", get_u24(word)); break;
+        default:     printf("[?0x%07X]", get_u24(word)); break;
+      }
+      break;
+    }
+  }
+}
+
+__device__ void pretty_print_port(Net* net, Port port) {
+  Port stack[4096];
+  stack[0] = port;
+  u32 len = 1;
+  while (len > 0) {
+    if (len > 256) {
+      printf("ERROR: result too deep to print. This will be fixed soon(TM)");
+      --len;
+      continue;
+    }
+    Port cur = stack[--len];
+    switch (get_tag(cur)) {
+      case CON: {
+        Pair node = node_load(net,get_val(cur));
+        Port p2   = get_snd(node);
+        Port p1   = get_fst(node);
+        printf("(");
+        stack[len++] = new_port(ERA, (u32)(')'));
+        stack[len++] = p2;
+        stack[len++] = new_port(ERA, (u32)(' '));
+        stack[len++] = p1;
+        break;
+      }
+      case ERA: {
+        if (get_val(cur) != 0) {
+          printf("%c", (char)get_val(cur));
+        } else {
+          printf("*");
+        }
+        break;
+      }
+      case VAR: {
+        Port got = vars_load(net, get_val(cur));
+        if (got != NONE) {
+          stack[len++] = got;
+        } else {
+          printf("x%x", get_val(cur));
+        }
+        break;
+      }
+      case NUM: {
+        pretty_print_numb(get_val(cur));
+        break;
+      }
+      case DUP: {
+        Pair node = node_load(net,get_val(cur));
+        Port p2   = get_snd(node);
+        Port p1   = get_fst(node);
+        printf("{");
+        stack[len++] = new_port(ERA, (u32)('}'));
+        stack[len++] = p2;
+        stack[len++] = new_port(ERA, (u32)(' '));
+        stack[len++] = p1;
+        break;
+      }
+      case OPR: {
+        Pair node = node_load(net,get_val(cur));
+        Port p2   = get_snd(node);
+        Port p1   = get_fst(node);
+        printf("$(");
+        stack[len++] = new_port(ERA, (u32)(')'));
+        stack[len++] = p2;
+        stack[len++] = new_port(ERA, (u32)(' '));
+        stack[len++] = p1;
+        break;
+      }
+      case SWI: {
+        Pair node = node_load(net,get_val(cur));
+        Port p2   = get_snd(node);
+        Port p1   = get_fst(node);
+        printf("?(");
+        stack[len++] = new_port(ERA, (u32)(')'));
+        stack[len++] = p2;
+        stack[len++] = new_port(ERA, (u32)(' '));
+        stack[len++] = p1;
+        break;
+      }
+      case REF: {
+        u32  fid = get_val(cur) & 0xFFFFFFF;
+        Def* def = &BOOK.defs_buf[fid];
+        printf("@%s", def->name);
+        break;
+      }
+    }
+  }
+}
+
+__device__ void pretty_print_rbag(Net* net, RBag* rbag) {
+  for (u32 i = 0; i < rbag->lo_end; ++i) {
+    Pair redex = rbag->lo_buf[i%RLEN];
+    if (redex != 0) {
+      pretty_print_port(net, get_fst(redex));
+      printf(" ~ ");
+      pretty_print_port(net, get_snd(redex));
+      printf("\n");
+    }
+  }
+  for (u32 i = 0; i < rbag->hi_end; ++i) {
+    Pair redex = rbag->hi_buf[i];
+    if (redex != 0) {
+      pretty_print_port(net, get_fst(redex));
+      printf(" ~ ");
+      pretty_print_port(net, get_snd(redex));
+      printf("\n");
+    }
+  }
+}
+
+__global__ void print_heatmap(GNet* gnet, u32 turn) {
+  if (GID() > 0) return;
+
+  const char* heatChars[] = {
+    //" ", ".", ":", ":",
+    //"∴", "⁘", "⁙", "░",
+    //"░", "░", "▒", "▒",
+    //"▒", "▓", "▓", "▓"
+    " ", "1", "2", "3",
+    "4", "5", "6", "7",
+    "8", "9", "A", "B",
+    "C", "D", "E", "F",
+  };
+
+  for (u32 bid = 0; bid < BPG; bid++) {
+    printf("|");
+    for (u32 tid = 0; tid < TPB; tid++) {
+      u32 gid = bid * TPB + tid;
+      u32 len = 0;
+      for (u32 i = 0; i < RLEN; i++) {
+        if ( turn % 2 == 0 && gnet->rbag_buf_A[gid * RLEN + i] != 0
+          || turn % 2 == 1 && gnet->rbag_buf_B[gid * RLEN + i] != 0) {
+          len++;
+        }
+      }
+      u32 pos = gnet->rbag_pos[gid];
+      u32 heat = min(len, 0xF);
+      printf("%s", heatChars[heat]);
+    }
+    printf("|\n");
+  }
+}
+
+__global__ void print_result(GNet* gnet) {
+  Net net = vnet_new(gnet, NULL, gnet->turn);
+  if (threadIdx.x == 0 && blockIdx.x == 0) {
+    printf("Result: ");
+    pretty_print_port(&net, enter(&net, ROOT));
+    printf("\n");
+  }
+}
+
+#endif // show_cuh_INCLUDED
diff --git a/src/cuda/structs.cuh b/src/cuda/structs.cuh
new file mode 100644
index 00000000..c33bbfde
--- /dev/null
+++ b/src/cuda/structs.cuh
@@ -0,0 +1,330 @@
+#ifndef structs_cuh_INCLUDED
+#define structs_cuh_INCLUDED
+
+#include "port/port.cuh"
+#include "rule.cuh"
+#include "config.cuh"
+#include "grid.cuh"
+#include "constants.cuh"
+
+// Structures
+// ----------
+
+// Global Net
+struct GNet {
+  u32  rbag_use_A; // total rbag redex count (buffer A)
+  u32  rbag_use_B; // total rbag redex count (buffer B)
+  Pair rbag_buf_A[G_RBAG_LEN]; // global redex bag (buffer A)
+  Pair rbag_buf_B[G_RBAG_LEN]; // global redex bag (buffer B)
+  Pair node_buf[G_NODE_LEN]; // global node buffer
+  Port vars_buf[G_VARS_LEN]; // global vars buffer
+  u32  node_put[TPB*BPG];
+  u32  vars_put[TPB*BPG];
+  u32  rbag_pos[TPB*BPG];
+  u8   mode; // evaluation mode (curr)
+  u64  itrs; // interaction count
+  u64  iadd; // interaction count adder
+  u64  leak; // leak count
+  u32  turn; // turn count
+  u8   down; // are we recursing down?
+  u8   rdec; // decrease rpos by 1?
+};
+
+// Local Net
+struct LNet {
+  Pair node_buf[L_NODE_LEN];
+  Port vars_buf[L_VARS_LEN];
+};
+
+// Thread Redex Bag
+// It uses the same space to store two stacks:
+// - HI: a high-priotity stack, for shrinking reductions
+// - LO: a low-priority stack, for growing reductions
+struct RBag {
+  u32  hi_end;
+  Pair hi_buf[RLEN];
+  u32  lo_end;
+  Pair lo_buf[RLEN];
+};
+
+// Thread Memory
+struct TM {
+  u32  page; // page index
+  u32  nput; // node alloc index
+  u32  vput; // vars alloc index
+  u32  mode; // evaluation mode
+  u32  itrs; // interactions
+  u32  leak; // leaks
+  u32  nloc[L_NODE_LEN/TPB]; // node allocs
+  u32  vloc[L_NODE_LEN/TPB]; // vars allocs
+  RBag rbag; // tmem redex bag
+};
+
+// Top-Level Definition
+struct Def {
+  char name[256];
+  bool safe;
+  u32  rbag_len;
+  u32  node_len;
+  u32  vars_len;
+  Port root;
+  Pair rbag_buf[L_NODE_LEN/TPB];
+  Pair node_buf[L_NODE_LEN/TPB];
+};
+
+// A Foreign Function
+typedef struct {
+  char name[256];
+  Port (*func)(GNet*, Port);
+} FFn;
+
+// Book of Definitions
+struct Book {
+  u32 defs_len;
+  Def defs_buf[0x4000];
+  u32 ffns_len;
+  FFn ffns_buf[0x4000];
+};
+
+// Static Book
+__device__ Book BOOK;
+
+// View Net: includes both GNet and LNet
+struct Net {
+  i32   l_node_dif; // delta node space
+  i32   l_vars_dif; // delta vars space
+  Pair *l_node_buf; // local node buffer values
+  Port *l_vars_buf; // local vars buffer values
+  u32  *g_rbag_use_A; // global rbag count (active buffer)
+  u32  *g_rbag_use_B; // global rbag count (inactive buffer)
+  Pair *g_rbag_buf_A; // global rbag values (active buffer)
+  Pair *g_rbag_buf_B; // global rbag values (inactive buffer)
+  Pair *g_node_buf; // global node buffer values
+  Port *g_vars_buf; // global vars buffer values
+  u32  *g_node_put; // next global node allocation index
+  u32  *g_vars_put; // next global vars allocation index
+};
+
+// RBag
+// ----
+
+__device__ RBag rbag_new() {
+  RBag rbag;
+  rbag.hi_end = 0;
+  rbag.lo_end = 0;
+  return rbag;
+}
+
+__device__ u32 rbag_len(RBag* rbag) {
+  return rbag->hi_end + rbag->lo_end;
+}
+
+__device__ u32 rbag_has_highs(RBag* rbag) {
+  return rbag->hi_end > 0;
+}
+
+__device__ void push_redex(TM* tm, Pair redex) {
+  #ifdef DEBUG
+  bool free_hi = tm->rbag.hi_end < RLEN;
+  bool free_lo = tm->rbag.lo_end < RLEN;
+  if (!free_hi || !free_lo) {
+    debug("push_redex: limited resources, maybe corrupting memory\n");
+  }
+  #endif
+
+  Rule rule = get_pair_rule(redex);
+  if (is_high_priority(rule)) {
+    tm->rbag.hi_buf[tm->rbag.hi_end++] = redex;
+  } else {
+    tm->rbag.lo_buf[tm->rbag.lo_end++] = redex;
+  }
+}
+
+__device__ Pair pop_redex(TM* tm) {
+  if (tm->rbag.hi_end > 0) {
+    return tm->rbag.hi_buf[(--tm->rbag.hi_end) % RLEN];
+  } else if (tm->rbag.lo_end > 0) {
+    return tm->rbag.lo_buf[(--tm->rbag.lo_end) % RLEN];
+  } else {
+    return 0;
+  }
+}
+
+// TM
+// --
+
+__device__ TM tmem_new() {
+  TM tm;
+  tm.rbag = rbag_new();
+  tm.nput = 1;
+  tm.vput = 1;
+  tm.mode = SEED;
+  tm.itrs = 0;
+  tm.leak = 0;
+  return tm;
+}
+
+// Net
+// ----
+
+__device__ Net vnet_new(GNet* gnet, void* smem, u32 turn) {
+  Net net;
+  net.l_node_dif   = 0;
+  net.l_vars_dif   = 0;
+  net.l_node_buf   = smem == NULL ? net.l_node_buf : ((LNet*)smem)->node_buf;
+  net.l_vars_buf   = smem == NULL ? net.l_vars_buf : ((LNet*)smem)->vars_buf;
+  net.g_rbag_use_A = turn % 2 == 0 ? &gnet->rbag_use_A : &gnet->rbag_use_B;
+  net.g_rbag_use_B = turn % 2 == 0 ? &gnet->rbag_use_B : &gnet->rbag_use_A;
+  net.g_rbag_buf_A = turn % 2 == 0 ? gnet->rbag_buf_A : gnet->rbag_buf_B;
+  net.g_rbag_buf_B = turn % 2 == 0 ? gnet->rbag_buf_B : gnet->rbag_buf_A;
+  net.g_node_buf   = gnet->node_buf;
+  net.g_vars_buf   = gnet->vars_buf;
+  net.g_node_put   = &gnet->node_put[GID()];
+  net.g_vars_put   = &gnet->vars_put[GID()];
+  return net;
+}
+
+// Stores a new node on global.
+__device__ inline void node_create(Net* net, u32 loc, Pair val) {
+  Pair old;
+  if (loc < L_NODE_LEN) {
+    net->l_node_dif += 1;
+    old = atomicExch(&net->l_node_buf[loc], val);
+  } else {
+    old = atomicExch(&net->g_node_buf[loc], val);
+  }
+  #ifdef DEBUG
+  if (old != 0) printf("[%04x] ERR NODE_CREATE | %04x\n", GID(), loc);
+  #endif
+}
+
+// Stores a var on global.
+__device__ inline void vars_create(Net* net, u32 var, Port val) {
+  Port old;
+  if (var < L_VARS_LEN) {
+    net->l_vars_dif += 1;
+    old = atomicExch(&net->l_vars_buf[var], val);
+  } else {
+    old = atomicExch(&net->g_vars_buf[var], val);
+  }
+  #ifdef DEBUG
+  if (old != 0) printf("[%04x] ERR VARS_CREATE | %04x\n", GID(), var);
+  #endif
+}
+
+// Reads a node from global.
+__device__ __host__ inline Pair node_load(Net* net, u32 loc) {
+  Pair got;
+  if (loc < L_NODE_LEN) {
+    got = net->l_node_buf[loc];
+  } else {
+    got = net->g_node_buf[loc];
+  }
+  return got;
+}
+
+// Reads a var from global.
+__device__ __host__ inline Port vars_load(Net* net, u32 var) {
+  Port got;
+  if (var < L_VARS_LEN) {
+    got = net->l_vars_buf[var];
+  } else {
+    got = net->g_vars_buf[var];
+  }
+  return got;
+}
+
+// Exchanges a node on global by a value. Returns old.
+__device__ inline Pair node_exchange(Net* net, u32 loc, Pair val) {
+  Pair got = 0;
+  if (loc < L_NODE_LEN) {
+    got = atomicExch(&net->l_node_buf[loc], val);
+  } else {
+    got = atomicExch(&net->g_node_buf[loc], val);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR NODE_EXCHANGE | %04x\n", GID(), loc);
+  #endif
+  return got;
+}
+
+// Exchanges a var on global by a value. Returns old.
+__device__ inline Port vars_exchange(Net* net, u32 var, Port val) {
+  Port got = 0;
+  if (var < L_VARS_LEN) {
+    got = atomicExch(&net->l_vars_buf[var], val);
+  } else {
+    got = atomicExch(&net->g_vars_buf[var], val);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR VARS_EXCHANGE | %04x\n", GID(), var);
+  #endif
+  return got;
+}
+
+// Takes a node.
+__device__ inline Pair node_take(Net* net, u32 loc) {
+  Pair got = 0;
+  if (loc < L_NODE_LEN) {
+    net->l_node_dif -= 1;
+    got = atomicExch(&net->l_node_buf[loc], 0);
+  } else {
+    got = atomicExch(&net->g_node_buf[loc], 0);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR NODE_TAKE | %04x\n", GID(), loc);
+  #endif
+  return got;
+}
+
+// Takes a var.
+__device__ inline Port vars_take(Net* net, u32 var) {
+  Port got = 0;
+  if (var < L_VARS_LEN) {
+    net->l_vars_dif -= 1;
+    got = atomicExch(&net->l_vars_buf[var], 0);
+  } else {
+    got = atomicExch(&net->g_vars_buf[var], 0);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR VARS_TAKE | %04x\n", GID(), var);
+  #endif
+  return got;
+}
+
+// Finds a variable's value.
+__device__ inline Port peek(Net* net, Port var) {
+  while (get_tag(var) == VAR) {
+    Port val = vars_load(net, get_val(var));
+    if (val == NONE) break;
+    if (val == 0) break;
+    var = val;
+  }
+  return var;
+}
+
+// Finds a variable's value.
+__device__ inline Port enter(Net* net, Port var) {
+  u32 lps = 0;
+  Port init = var;
+  // While `B` is VAR: extend it (as an optimization)
+  while (get_tag(var) == VAR) {
+    // Takes the current `var` substitution as `val`
+    Port val = vars_exchange(net, get_val(var), NONE);
+    // If there was no `val`, stop, as there is no extension
+    if (val == NONE) {
+      break;
+    }
+    // Sanity check: if global A is unfilled, stop
+    if (val == 0) {
+      break;
+    }
+    // Otherwise, delete `B` (we own both) and continue
+    vars_take(net, get_val(var));
+    //if (++lps > 65536) printf("[%04x] BUG A | init=%s var=%s val=%s\n", GID(), show_port(init).x, show_port(var).x, show_port(val).x);
+    var = val;
+  }
+  return var;
+}
+
+#endif // structs_cuh_INCLUDED
diff --git a/src/cuda/types.cuh b/src/cuda/types.cuh
new file mode 100644
index 00000000..3f0d9cf5
--- /dev/null
+++ b/src/cuda/types.cuh
@@ -0,0 +1,58 @@
+#ifndef types_cuh_INCLUDED
+#define types_cuh_INCLUDED
+
+#include "common.cuh"
+#include "config.cuh"
+
+// Values
+// ------
+// Val ::= 29-bit (rounded up to u32)
+// The 29 least significant bits in a Port
+typedef u32 Val;
+
+// Tags
+// ----
+// Tag ::= 3-bit (rounded up to u8)
+// The 3 most significant bits in a Port.
+typedef u8 Tag;
+
+const Tag VAR = 0x0; // variable
+const Tag REF = 0x1; // reference
+const Tag ERA = 0x2; // eraser
+const Tag NUM = 0x3; // number
+const Tag CON = 0x4; // constructor
+const Tag DUP = 0x5; // duplicator
+const Tag OPR = 0x6; // operator
+const Tag SWI = 0x7; // switch
+
+// Ports
+// -----
+// Port ::= Tag + Val (fits a u32)
+typedef u32 Port;
+
+/// Pair
+/// ----
+// Pair ::= Port + Port (fits a u64)
+typedef u64 Pair;
+
+// Interaction Rules
+// -----------------
+// Rule ::= 3-bit (rounded up to 8)
+typedef u8 Rule;
+
+const Rule LINK = 0x0;
+const Rule CALL = 0x1;
+const Rule VOID = 0x2;
+const Rule ERAS = 0x3;
+const Rule ANNI = 0x4;
+const Rule COMM = 0x5;
+const Rule OPER = 0x6;
+const Rule SWIT = 0x7;
+
+// Numbs
+// -----
+// Numb ::= 29-bit (rounded up to u32)
+// One of the 8 possible kinds of values of a port.
+typedef u32 Numb;
+
+#endif // types_cuh_INCLUDED
diff --git a/src/makefile b/src/makefile
new file mode 100644
index 00000000..a2d2f451
--- /dev/null
+++ b/src/makefile
@@ -0,0 +1,8 @@
+NVCC = nvcc
+CUDAFLAGS = -Icuda
+
+%-cu.o: cuda/%.cu
+	$(NVCC) -c -o $@ $< $(CUDAFLAGS)
+
+hvm-cu: hvm-cu.o
+	$(NVCC) $(CUDAFLAGS) -o hvm-cu $^

From 5710e499b9032f9293c73fcbb9dd32424278ebb3 Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Sun, 25 Aug 2024 10:54:38 +0200
Subject: [PATCH 3/7] remove grid

---
 src/cuda/alloc.cuh   |  1 -
 src/cuda/common.cuh  | 12 ++++++++++++
 src/cuda/grid.cuh    | 18 ------------------
 src/cuda/hvm.cu      | 12 ------------
 src/cuda/show.cuh    |  2 +-
 src/cuda/structs.cuh | 17 ++++++++++++++---
 6 files changed, 27 insertions(+), 35 deletions(-)
 delete mode 100644 src/cuda/grid.cuh

diff --git a/src/cuda/alloc.cuh b/src/cuda/alloc.cuh
index 0040d2dc..bd6b249b 100644
--- a/src/cuda/alloc.cuh
+++ b/src/cuda/alloc.cuh
@@ -3,7 +3,6 @@
 
 #include "types.cuh"
 #include "config.cuh"
-#include "grid.cuh"
 #include "structs.cuh"
 #include <stdio.h>
 
diff --git a/src/cuda/common.cuh b/src/cuda/common.cuh
index 2e7dd128..ec3149ec 100644
--- a/src/cuda/common.cuh
+++ b/src/cuda/common.cuh
@@ -24,4 +24,16 @@ __host__ __device__ inline u64 time64() {
   return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
 }
 
+__device__ inline u32 TID() {
+  return threadIdx.x;
+}
+
+__device__ inline u32 BID() {
+  return blockIdx.x;
+}
+
+__device__ inline u32 GID() {
+  return TID() + BID() * blockDim.x;
+}
+
 #endif // common_cuh_INCLUDED
diff --git a/src/cuda/grid.cuh b/src/cuda/grid.cuh
deleted file mode 100644
index a8f1d24e..00000000
--- a/src/cuda/grid.cuh
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef grid_cuh_INCLUDED
-#define grid_cuh_INCLUDED
-
-#include "types.cuh"
-
-__device__ inline u32 TID() {
-  return threadIdx.x;
-}
-
-__device__ inline u32 BID() {
-  return blockIdx.x;
-}
-
-__device__ inline u32 GID() {
-  return TID() + BID() * blockDim.x;
-}
-
-#endif // grid_cuh_INCLUDED
diff --git a/src/cuda/hvm.cu b/src/cuda/hvm.cu
index b7ed53b8..0b9c2548 100644
--- a/src/cuda/hvm.cu
+++ b/src/cuda/hvm.cu
@@ -544,18 +544,6 @@ __device__ void load_redexes(Net* net, TM *tm, u32 turn) {
 // Kernels
 // -------
 
-// Sets the initial redex.
-__global__ void boot_redex(GNet* gnet, Pair redex) {
-  // Creates root variable.
-  gnet->vars_buf[get_val(ROOT)] = NONE;
-  // Creates root redex.
-  if (gnet->turn % 2 == 0) {
-    gnet->rbag_buf_A[0] = redex;
-  } else {
-    gnet->rbag_buf_B[0] = redex;
-  }
-}
-
 // Creates a node.
 __global__ void make_node(GNet* gnet, Tag tag, Port fst, Port snd, Port* ret) {
   if (GID() == 0) {
diff --git a/src/cuda/show.cuh b/src/cuda/show.cuh
index 01af8cdf..940e9bbd 100644
--- a/src/cuda/show.cuh
+++ b/src/cuda/show.cuh
@@ -14,7 +14,7 @@ struct Show {
 __device__ __host__ Show show_port(Port port);
 __device__ __host__ Show show_rule(Rule rule);
 
-__device__ void print_net(Net* net, u32 start, u32 end);
+__device__ __host__ void print_net(Net* net, u32 start, u32 end);
 __device__ void print_rbag(Net* net, TM* tm);
 __device__ void pretty_print_rbag(Net* net, RBag* rbag);
 __device__ void pretty_print_port(Net* net, Port port);
diff --git a/src/cuda/structs.cuh b/src/cuda/structs.cuh
index c33bbfde..5af44921 100644
--- a/src/cuda/structs.cuh
+++ b/src/cuda/structs.cuh
@@ -4,7 +4,6 @@
 #include "port/port.cuh"
 #include "rule.cuh"
 #include "config.cuh"
-#include "grid.cuh"
 #include "constants.cuh"
 
 // Structures
@@ -105,8 +104,8 @@ struct Net {
   u32  *g_vars_put; // next global vars allocation index
 };
 
-// RBag
-// ----
+// Redex Bag
+// ---------
 
 __device__ RBag rbag_new() {
   RBag rbag;
@@ -150,6 +149,18 @@ __device__ Pair pop_redex(TM* tm) {
   }
 }
 
+// Sets the initial redex.
+__global__ void boot_redex(GNet* gnet, Pair redex) {
+  // Creates root variable.
+  gnet->vars_buf[get_val(ROOT)] = NONE;
+  // Creates root redex.
+  if (gnet->turn % 2 == 0) {
+    gnet->rbag_buf_A[0] = redex;
+  } else {
+    gnet->rbag_buf_B[0] = redex;
+  }
+}
+
 // TM
 // --
 

From 93285293ed068f8c29fc38dca74a9019a43a2729 Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Mon, 26 Aug 2024 11:53:48 +0200
Subject: [PATCH 4/7] another working snapshot

---
 src/c/run.c                  |   7 +
 src/cuda/alloc.cuh           |  33 +++-
 src/cuda/common.cuh          |  63 +++++--
 src/cuda/constants.cuh       |   2 +-
 src/cuda/hvm.cu              | 332 ++---------------------------------
 src/cuda/hvm.cuh             |  12 --
 src/cuda/{port => }/numb.cuh |  27 ++-
 src/cuda/pair.cuh            |  35 +++-
 src/cuda/{port => }/port.cuh |  12 +-
 src/cuda/rule.cuh            |   4 +-
 src/cuda/show.cuh            |   7 +-
 src/cuda/structs.cuh         | 236 +------------------------
 src/cuda/structs/book.cuh    |  56 ++++++
 src/cuda/structs/gnet.cuh    | 135 ++++++++++++++
 src/cuda/structs/rbag.cuh    |  48 +++++
 src/cuda/structs/tm.cuh      |  18 ++
 src/cuda/structs/vnet.cuh    | 166 ++++++++++++++++++
 src/cuda/sync.cuh            |  90 ++++++++++
 src/cuda/types.cuh           |  58 ------
 19 files changed, 689 insertions(+), 652 deletions(-)
 delete mode 100644 src/cuda/hvm.cuh
 rename src/cuda/{port => }/numb.cuh (92%)
 rename src/cuda/{port => }/port.cuh (84%)
 create mode 100644 src/cuda/structs/book.cuh
 create mode 100644 src/cuda/structs/gnet.cuh
 create mode 100644 src/cuda/structs/rbag.cuh
 create mode 100644 src/cuda/structs/tm.cuh
 create mode 100644 src/cuda/structs/vnet.cuh
 create mode 100644 src/cuda/sync.cuh
 delete mode 100644 src/cuda/types.cuh

diff --git a/src/c/run.c b/src/c/run.c
index 13b3fa94..2bfb7960 100644
--- a/src/c/run.c
+++ b/src/c/run.c
@@ -596,6 +596,13 @@ Port io_seek(Net* net, Book* book, Port argm) {
   return inject_ok(net, new_port(ERA, 0));
 }
 
+// TODO: write a time64() function that returns the time as fast as possible as a u64
+__host__ __device__ inline u64 time64() {
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
+}
+
 // Returns the current time as a tuple of the high
 // and low 24 bits of a 48-bit nanosecond timestamp.
 // Returns: Result<(u24, u24), IOError<*>>
diff --git a/src/cuda/alloc.cuh b/src/cuda/alloc.cuh
index bd6b249b..0bf856e5 100644
--- a/src/cuda/alloc.cuh
+++ b/src/cuda/alloc.cuh
@@ -1,11 +1,16 @@
+// Functions to allocate variables and nodes.
+
 #ifndef alloc_cuh_INCLUDED
 #define alloc_cuh_INCLUDED
 
-#include "types.cuh"
+#include "common.cuh"
 #include "config.cuh"
-#include "structs.cuh"
+#include "structs/vnet.cuh"
 #include <stdio.h>
 
+// Local Net Allocations
+// ---------------------
+
 template <typename A>
 __device__ u32 g_alloc_1(Net* net, u32* g_put, A* g_buf) {
   u32 lps = 0;
@@ -152,4 +157,28 @@ __device__ bool get_resources(Net* net, TM* tm, u32 need_rbag, u32 need_node, u3
   return got_rbag >= need_rbag && got_node >= need_node && got_vars >= need_vars;
 }
 
+// Global Net Allocations
+// ----------------------
+
+// Creates a node.
+__global__ void make_node(GNet* gnet, Tag tag, Port fst, Port snd, Port* ret) {
+  if (GID() == 0) {
+    Net net = vnet_new(gnet, NULL, gnet->turn);
+    u32 loc = g_node_alloc_1(&net);
+    node_create(&net, loc, new_pair(fst, snd));
+    *ret = new_port(tag, loc);
+  }
+}
+
+// Allocs and creates a node, returning its port.
+Port gnet_make_node(GNet* gnet, Tag tag, Port fst, Port snd) {
+  Port ret;
+  Port* d_ret;
+  cudaMalloc(&d_ret, sizeof(Port));
+  make_node<<<1,1>>>(gnet, tag, fst, snd, d_ret);
+  cudaMemcpy(&ret, d_ret, sizeof(Port), cudaMemcpyDeviceToHost);
+  cudaFree(d_ret);
+  return ret;
+}
+
 #endif // alloc_cuh_INCLUDED
diff --git a/src/cuda/common.cuh b/src/cuda/common.cuh
index ec3149ec..63557324 100644
--- a/src/cuda/common.cuh
+++ b/src/cuda/common.cuh
@@ -1,8 +1,13 @@
+// Common type aliases and functions used across the codebase that aren't
+// necessarily associated with any specific part.
+
 #ifndef common_cuh_INCLUDED
 #define common_cuh_INCLUDED
 
 #include <stdint.h>
 
+// Numeric Type Aliases
+// --------------------
 typedef  uint8_t u8;
 typedef uint16_t u16;
 typedef uint32_t u32;
@@ -11,18 +16,54 @@ typedef  int32_t i32;
 typedef    float f32;
 typedef   double f64;
 
-// Clamps a float between two values.
-__host__ __device__ inline f32 clamp(f32 x, f32 min, f32 max) {
-  const f32 t = x < min ? min : x;
-  return (t > max) ? max : t;
-}
+// Values
+// ------
+// Val ::= 29-bit (rounded up to u32)
+// The 29 least significant bits in a Port
+typedef u32 Val;
 
-// TODO: write a time64() function that returns the time as fast as possible as a u64
-__host__ __device__ inline u64 time64() {
-  struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
-  return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
-}
+// Tags
+// ----
+// Tag ::= 3-bit (rounded up to u8)
+// These are the 3 most significant bits in a Port, and
+// they identify the type of port.
+typedef u8 Tag;
+
+const Tag VAR = 0x0; // variable
+const Tag REF = 0x1; // reference
+const Tag ERA = 0x2; // eraser
+const Tag NUM = 0x3; // number
+const Tag CON = 0x4; // constructor
+const Tag DUP = 0x5; // duplicator
+const Tag OPR = 0x6; // operator
+const Tag SWI = 0x7; // switch
+
+// Ports
+// -----
+// Port ::= Tag + Val (fits a u32)
+typedef u32 Port;
+
+/// Pair
+/// ----
+// Pair ::= Port + Port (fits a u64)
+typedef u64 Pair;
+
+// Interaction Rules
+// -----------------
+// Rule ::= 3-bit (rounded up to 8)
+typedef u8 Rule;
+
+const Rule LINK = 0x0;
+const Rule CALL = 0x1;
+const Rule VOID = 0x2;
+const Rule ERAS = 0x3;
+const Rule ANNI = 0x4;
+const Rule COMM = 0x5;
+const Rule OPER = 0x6;
+const Rule SWIT = 0x7;
+
+// Grid Functions
+// --------------
 
 __device__ inline u32 TID() {
   return threadIdx.x;
diff --git a/src/cuda/constants.cuh b/src/cuda/constants.cuh
index 4357f333..85972992 100644
--- a/src/cuda/constants.cuh
+++ b/src/cuda/constants.cuh
@@ -1,7 +1,7 @@
 #ifndef constants_cuh_INCLUDED
 #define constants_cuh_INCLUDED
 
-#include "types.cuh"
+#include "common.cuh"
 
 // Special Substitution Map Values
 const Port FREE = 0x00000000;
diff --git a/src/cuda/hvm.cu b/src/cuda/hvm.cu
index 0b9c2548..2699276c 100644
--- a/src/cuda/hvm.cu
+++ b/src/cuda/hvm.cu
@@ -2,109 +2,17 @@
 #define WITH_MAIN
 
 #include "alloc.cuh"
-#include "port/numb.cuh"
+#include "structs/tm.cuh"
+#include "structs/book.cuh"
+#include "structs/gnet.cuh"
+#include "structs/rbag.cuh"
+#include "numb.cuh"
 #include "show.cuh"
+#include "sync.cuh"
 
 #include <stdio.h>
 #include <stdlib.h>
 
-__device__ __host__ Pair set_par_flag(Pair pair) {
-  Port p1 = get_fst(pair);
-  Port p2 = get_snd(pair);
-  if (get_tag(p1) == REF) {
-    return new_pair(new_port(get_tag(p1), get_val(p1) | 0x10000000), p2);
-  } else {
-    return pair;
-  }
-}
-
-__device__ __host__ Pair clr_par_flag(Pair pair) {
-  Port p1 = get_fst(pair);
-  Port p2 = get_snd(pair);
-  if (get_tag(p1) == REF) {
-    return new_pair(new_port(get_tag(p1), get_val(p1) & 0xFFFFFFF), p2);
-  } else {
-    return pair;
-  }
-}
-
-__device__ __host__ bool get_par_flag(Pair pair) {
-  Port p1 = get_fst(pair);
-  if (get_tag(p1) == REF) {
-    return (get_val(p1) >> 28) == 1;
-  } else {
-    return false;
-  }
-}
-
-// Utils
-// -----
-
-// Transposes an index over a matrix.
-__device__ u32 transpose(u32 idx, u32 width, u32 height) {
-  u32 old_row = idx / width;
-  u32 old_col = idx % width;
-  u32 new_row = old_col % height;
-  u32 new_col = old_col / height + old_row * (width / height);
-  return new_row * width + new_col;
-}
-
-// Returns true if all 'x' are true, block-wise
-__device__ __noinline__ bool block_all(bool x) {
-  __shared__ bool res;
-  if (TID() == 0) res = true;
-  __syncthreads();
-  if (!x) res = false;
-  __syncthreads();
-  return res;
-}
-
-// Returns true if any 'x' is true, block-wise
-__device__ __noinline__ bool block_any(bool x) {
-  __shared__ bool res;
-  if (TID() == 0) res = false;
-  __syncthreads();
-  if (x) res = true;
-  __syncthreads();
-  return res;
-}
-
-// Returns the sum of a value, block-wise
-template <typename A>
-__device__ __noinline__ A block_sum(A x) {
-  __shared__ A res;
-  if (TID() == 0) res = 0;
-  __syncthreads();
-  atomicAdd(&res, x);
-  __syncthreads();
-  return res;
-}
-
-// Returns the sum of a boolean, block-wise
-__device__ __noinline__ u32 block_count(bool x) {
-  __shared__ u32 res;
-  if (TID() == 0) res = 0;
-  __syncthreads();
-  atomicAdd(&res, x);
-  __syncthreads();
-  return res;
-}
-
-// Prints a 4-bit value for each thread in a block
-__device__ void block_print(u32 x) {
-  __shared__ u8 value[TPB];
-
-  value[TID()] = x;
-  __syncthreads();
-
-  if (TID() == 0) {
-    for (u32 i = 0; i < TPB; ++i) {
-      printf("%x", min(value[i],0xF));
-    }
-  }
-  __syncthreads();
-}
-
 // Linking
 // -------
 
@@ -482,6 +390,16 @@ __device__ bool interact(Net* net, TM* tm, Pair redex, u32 turn) {
 // RBag Save/Load
 // --------------
 
+// Transposes an index over a matrix.
+__device__ u32 transpose(u32 idx, u32 width, u32 height) {
+  u32 old_row = idx / width;
+  u32 old_col = idx % width;
+  u32 new_row = old_col % height;
+  u32 new_col = old_col / height + old_row * (width / height);
+  return new_row * width + new_col;
+}
+
+
 // Moves redexes from shared memory to global bag
 __device__ void save_redexes(Net* net, TM *tm, u32 turn) {
   u32 idx = 0;
@@ -544,57 +462,6 @@ __device__ void load_redexes(Net* net, TM *tm, u32 turn) {
 // Kernels
 // -------
 
-// Creates a node.
-__global__ void make_node(GNet* gnet, Tag tag, Port fst, Port snd, Port* ret) {
-  if (GID() == 0) {
-    Net net = vnet_new(gnet, NULL, gnet->turn);
-    u32 loc = g_node_alloc_1(&net);
-    node_create(&net, loc, new_pair(fst, snd));
-    *ret = new_port(tag, loc);
-  }
-}
-
-__global__ void inbetween(GNet* gnet) {
-  // Clears rbag use counter
-  if (gnet->turn % 2 == 0) {
-    gnet->rbag_use_A = 0;
-  } else {
-    gnet->rbag_use_B = 0;
-  }
-
-  // Increments gnet turn
-  gnet->turn += 1;
-
-  // Increments interaction counter
-  gnet->itrs += gnet->iadd;
-
-  // Resets the rdec variable
-  gnet->rdec = 0;
-
-  // Moves to next mode
-  if (!gnet->down) {
-    gnet->mode = min(gnet->mode + 1, WORK);
-  }
-
-  // If no work was done...
-  if (gnet->iadd == 0) {
-    // If on seed mode, go up to GROW mode
-    if (gnet->mode == SEED) {
-      gnet->mode = GROW;
-      gnet->down = 0;
-    // Otherwise, go down to SEED mode
-    } else {
-      gnet->mode = SEED;
-      gnet->down = 1;
-      gnet->rdec = 1; // peel one rpos
-    }
-    //printf(">> CHANGE MODE TO %d | %d <<\n", gnet->mode, gnet->down);
-  }
-
-  // Reset interaction adder
-  gnet->iadd = 0;
-}
-
 // EVAL
 __global__ void evaluator(GNet* gnet) {
   extern __shared__ char shared_mem[]; // 96 KB
@@ -808,53 +675,6 @@ __global__ void evaluator(GNet* gnet) {
 // GNet Host Functions
 // -------------------
 
-// Initializes the GNet
-__global__ void initialize(GNet* gnet) {
-  gnet->node_put[GID()] = 0;
-  gnet->vars_put[GID()] = 0;
-  gnet->rbag_pos[GID()] = 0;
-  for (u32 i = 0; i < RLEN; ++i) {
-    gnet->rbag_buf_A[G_RBAG_LEN / TPG * GID() + i] = 0;
-  }
-  for (u32 i = 0; i < RLEN; ++i) {
-    gnet->rbag_buf_B[G_RBAG_LEN / TPG * GID() + i] = 0;
-  }
-}
-
-GNet* gnet_create() {
-  GNet *gnet;
-  cudaMalloc((void**)&gnet, sizeof(GNet));
-  initialize<<<BPG, TPB>>>(gnet);
-  //cudaMemset(gnet, 0, sizeof(GNet));
-  return gnet;
-}
-
-u32 gnet_get_rlen(GNet* gnet, u32 turn) {
-  u32 rbag_use;
-  if (turn % 2 == 0) {
-    cudaMemcpy(&rbag_use, &gnet->rbag_use_B, sizeof(u32), cudaMemcpyDeviceToHost);
-  } else {
-    cudaMemcpy(&rbag_use, &gnet->rbag_use_A, sizeof(u32), cudaMemcpyDeviceToHost);
-  }
-  return rbag_use;
-}
-
-u64 gnet_get_itrs(GNet* gnet) {
-  u64 itrs;
-  cudaMemcpy(&itrs, &gnet->itrs, sizeof(u64), cudaMemcpyDeviceToHost);
-  return itrs;
-}
-
-u64 gnet_get_leak(GNet* gnet) {
-  u64 leak;
-  cudaMemcpy(&leak, &gnet->leak, sizeof(u64), cudaMemcpyDeviceToHost);
-  return leak;
-}
-
-void gnet_boot_redex(GNet* gnet, Pair redex) {
-  boot_redex<<<BPG, TPB>>>(gnet, redex);
-}
-
 void gnet_normalize(GNet* gnet) {
   // Invokes the Evaluator Kernel repeatedly
   u32 turn;
@@ -868,7 +688,7 @@ void gnet_normalize(GNet* gnet) {
     //cudaDeviceSynchronize();
 
     evaluator<<<BPG, TPB, sizeof(LNet)>>>(gnet);
-    inbetween<<<1, 1>>>(gnet);
+    gnet_inbetween<<<1, 1>>>(gnet);
     //cudaDeviceSynchronize();
 
     //count_memory<<<BPG, TPB>>>(gnet);
@@ -886,35 +706,6 @@ void gnet_normalize(GNet* gnet) {
   }
 }
 
-// Reads a device node to host
-Pair gnet_node_load(GNet* gnet, u32 loc) {
-  Pair pair;
-  cudaMemcpy(&pair, &gnet->node_buf[loc], sizeof(Pair), cudaMemcpyDeviceToHost);
-  return pair;
-}
-
-// Reads a device var to host
-Port gnet_vars_load(GNet* gnet, u32 loc) {
-  Pair port;
-  cudaMemcpy(&port, &gnet->vars_buf[loc], sizeof(Port), cudaMemcpyDeviceToHost);
-  return port;
-}
-
-// Writes a host var to device
-void gnet_vars_create(GNet* gnet, u32 var, Port val) {
-  cudaMemcpy(&gnet->vars_buf[var], &val, sizeof(Port), cudaMemcpyHostToDevice);
-}
-
-// Like the enter() function, but from host and read-only
-Port gnet_peek(GNet* gnet, Port port) {
-  while (get_tag(port) == VAR) {
-    Port val = gnet_vars_load(gnet, get_val(port));
-    if (val == NONE) break;
-    port = val;
-  }
-  return port;
-}
-
 // Expands a REF Port.
 Port gnet_expand(GNet* gnet, Port port) {
   Port old = gnet_vars_load(gnet, get_val(ROOT));
@@ -929,95 +720,6 @@ Port gnet_expand(GNet* gnet, Port port) {
   return got;
 }
 
-// Allocs and creates a node, returning its port.
-Port gnet_make_node(GNet* gnet, Tag tag, Port fst, Port snd) {
-  Port ret;
-  Port* d_ret;
-  cudaMalloc(&d_ret, sizeof(Port));
-  make_node<<<1,1>>>(gnet, tag, fst, snd, d_ret);
-  cudaMemcpy(&ret, d_ret, sizeof(Port), cudaMemcpyDeviceToHost);
-  cudaFree(d_ret);
-  return ret;
-}
-
-// Book Loader
-// -----------
-
-bool book_load(Book* book, u32* buf) {
-  // Reads defs_len
-  book->defs_len = *buf++;
-
-  // Parses each def
-  for (u32 i = 0; i < book->defs_len; ++i) {
-    // Reads fid
-    u32 fid = *buf++;
-
-    // Gets def
-    Def* def = &book->defs_buf[fid];
-
-    // Reads name
-    memcpy(def->name, buf, 256);
-    buf += 64;
-
-    // Reads safe flag
-    def->safe = *buf++;
-
-    // Reads lengths
-    def->rbag_len = *buf++;
-    def->node_len = *buf++;
-    def->vars_len = *buf++;
-
-    if (def->rbag_len > L_NODE_LEN/TPB) {
-      fprintf(stderr, "def '%s' has too many redexes: %u\n", def->name, def->rbag_len);
-      return false;
-    }
-
-    if (def->node_len > L_NODE_LEN/TPB) {
-      fprintf(stderr, "def '%s' has too many nodes: %u\n", def->name, def->node_len);
-      return false;
-    }
-
-    // Reads root
-    def->root = *buf++;
-
-    // Reads rbag_buf
-    memcpy(def->rbag_buf, buf, 8*def->rbag_len);
-    buf += def->rbag_len * 2;
-
-    // Reads node_buf
-    memcpy(def->node_buf, buf, 8*def->node_len);
-    buf += def->node_len * 2;
-  }
-
-  return true;
-}
-
-__device__ u32 NODE_COUNT;
-__device__ u32 VARS_COUNT;
-
-__global__ void count_memory(GNet* gnet) {
-  u32 node_count = 0;
-  u32 vars_count = 0;
-  for (u32 i = GID(); i < G_NODE_LEN; i += TPG) {
-    if (gnet->node_buf[i] != 0) ++node_count;
-    if (gnet->vars_buf[i] != 0) ++vars_count;
-  }
-
-  __shared__ u32 block_node_count;
-  __shared__ u32 block_vars_count;
-
-  if (TID() == 0) block_node_count = 0;
-  if (TID() == 0) block_vars_count = 0;
-  __syncthreads();
-
-  atomicAdd(&block_node_count, node_count);
-  atomicAdd(&block_vars_count, vars_count);
-  __syncthreads();
-
-  if (TID() == 0) atomicAdd(&NODE_COUNT, block_node_count);
-  if (TID() == 0) atomicAdd(&VARS_COUNT, block_vars_count);
-}
-
 // Demos
 // -----
 
diff --git a/src/cuda/hvm.cuh b/src/cuda/hvm.cuh
deleted file mode 100644
index b724a2f8..00000000
--- a/src/cuda/hvm.cuh
+++ /dev/null
@@ -1,12 +0,0 @@
-#ifndef hvm_cuh_INCLUDED
-#define hvm_cuh_INCLUDED
-
-#include "config.cuh"
-#include "constants.cuh"
-#include "show.cuh"
-#include "structs.cuh"
-
-#include <math.h>
-#include <stdio.h>
-
-#endif // hvm_cuh_INCLUDED
diff --git a/src/cuda/port/numb.cuh b/src/cuda/numb.cuh
similarity index 92%
rename from src/cuda/port/numb.cuh
rename to src/cuda/numb.cuh
index 369a8abf..afa2fcaa 100644
--- a/src/cuda/port/numb.cuh
+++ b/src/cuda/numb.cuh
@@ -1,9 +1,15 @@
-#ifndef port_numb_cuh_INCLUDED
-#define port_numb_cuh_INCLUDED
+#ifndef numb_cuh_INCLUDED
+#define numb_cuh_INCLUDED
 
-#include "../types.cuh"
+#include "common.cuh"
 #include <math.h>
 
+// Numbs
+// -----
+// Numb ::= 29-bit (rounded up to u32)
+// One of the 8 possible kinds of values of a port.
+typedef u32 Numb;
+
 // Numeric Tags (Types and Operations)
 const Tag TY_SYM = 0x00;
 const Tag TY_U24 = 0x01;
@@ -29,7 +35,8 @@ const Tag FP_SHL = 0x14;
 const Tag OP_SHR = 0x15;
 const Tag FP_SHR = 0x16;
 
-// Numeric Bounds
+// Numeric Bounds, stored as floats since they are used for clamping
+// when casting a float to an (possibly unsigned) integer.
 const f32 U24_MAX = (f32) (1 << 24) - 1;
 const f32 U24_MIN = 0.0;
 const f32 I24_MAX = (f32) (1 << 23) - 1;
@@ -96,6 +103,12 @@ __host__ __device__ inline Numb partial(Numb a, Numb b) {
   return (b & ~0x1F) | get_sym(a);
 }
 
+// Clamps a float between two values.
+__host__ __device__ inline f32 clamp(f32 x, f32 min, f32 max) {
+  const f32 t = x < min ? min : x;
+  return (t > max) ? max : t;
+}
+
 // Cast a number to another type.
 // The semantics are meant to spiritually resemble rust's numeric casts:
 // - i24 <-> u24: is just reinterpretation of bits
@@ -116,7 +129,7 @@ __device__ __host__ inline Numb cast(Numb a, Numb b) {
     if (isnan(val)) {
       return new_u24(0);
     }
-    return new_u24((u32) clamp(val, 0.0, 16777215));
+    return new_u24((u32) clamp(val, U24_MIN, U24_MAX));
   }
 
   if (get_sym(a) == TY_I24 && get_typ(b) == TY_U24) {
@@ -130,7 +143,7 @@ __device__ __host__ inline Numb cast(Numb a, Numb b) {
     if (isnan(val)) {
       return new_i24(0);
     }
-    return new_i24((i32) clamp(val, -8388608.0, 8388607.0));
+    return new_i24((i32) clamp(val, I24_MIN, I24_MAX));
   }
 
   if (get_sym(a) == TY_F24 && get_typ(b) == TY_U24) return new_f24((f32) get_u24(b));
@@ -249,4 +262,4 @@ __device__ __host__ inline Numb operate(Numb a, Numb b) {
   }
 }
 
-#endif // port_numb_cuh_INCLUDED
+#endif // numb_cuh_INCLUDED
diff --git a/src/cuda/pair.cuh b/src/cuda/pair.cuh
index 42ab1b0c..f40c6fcb 100644
--- a/src/cuda/pair.cuh
+++ b/src/cuda/pair.cuh
@@ -1,7 +1,8 @@
 #ifndef pair_cuh_INCLUDED
 #define pair_cuh_INCLUDED
 
-#include "types.cuh"
+#include "common.cuh"
+#include "port.cuh"
 
 __host__ __device__ inline Pair new_pair(Port fst, Port snd) {
   return ((u64)snd << 32) | fst;
@@ -15,4 +16,36 @@ __host__ __device__ inline Port get_snd(Pair pair) {
   return pair >> 32;
 }
 
+// Parity Flag
+// -----------
+
+__device__ __host__ Pair set_par_flag(Pair pair) {
+  Port p1 = get_fst(pair);
+  Port p2 = get_snd(pair);
+  if (get_tag(p1) == REF) {
+    return new_pair(new_port(get_tag(p1), get_val(p1) | 0x10000000), p2);
+  } else {
+    return pair;
+  }
+}
+
+__device__ __host__ Pair clr_par_flag(Pair pair) {
+  Port p1 = get_fst(pair);
+  Port p2 = get_snd(pair);
+  if (get_tag(p1) == REF) {
+    return new_pair(new_port(get_tag(p1), get_val(p1) & 0xFFFFFFF), p2);
+  } else {
+    return pair;
+  }
+}
+
+__device__ __host__ bool get_par_flag(Pair pair) {
+  Port p1 = get_fst(pair);
+  if (get_tag(p1) == REF) {
+    return (get_val(p1) >> 28) == 1;
+  } else {
+    return false;
+  }
+}
+
 #endif // pair_cuh_INCLUDED
diff --git a/src/cuda/port/port.cuh b/src/cuda/port.cuh
similarity index 84%
rename from src/cuda/port/port.cuh
rename to src/cuda/port.cuh
index afbb8b1d..3c585d8b 100644
--- a/src/cuda/port/port.cuh
+++ b/src/cuda/port.cuh
@@ -1,8 +1,8 @@
-#ifndef port_port_cuh_INCLUDED
-#define port_port_cuh_INCLUDED
+#ifndef port_cuh_INCLUDED
+#define port_cuh_INCLUDED
 
-#include "../types.cuh"
-#include "../config.cuh"
+#include "common.cuh"
+#include "config.cuh"
 
 __host__ __device__ inline Port new_port(Tag tag, Val val) {
   return (val << 3) | tag;
@@ -36,7 +36,7 @@ __device__ __host__ inline bool is_global(Port a) {
   return (is_nod(a) || is_var(a)) && get_val(a) >= L_NODE_LEN;
 }
 
-// TODO(enricozb): move swap stuff to some internal file
+// TODO(enricozb): consider moving swap stuff to some internal file
 
 // Swaps two ports.
 __host__ __device__ inline void swap(Port *a, Port *b) {
@@ -48,4 +48,4 @@ __device__ __host__ inline bool should_swap(Port A, Port B) {
   return get_tag(B) < get_tag(A);
 }
 
-#endif // port_port_cuh_INCLUDED
+#endif // port_cuh_INCLUDED
diff --git a/src/cuda/rule.cuh b/src/cuda/rule.cuh
index d08cf285..f3e36417 100644
--- a/src/cuda/rule.cuh
+++ b/src/cuda/rule.cuh
@@ -1,8 +1,8 @@
 #ifndef rule_cuh_INCLUDED
 #define rule_cuh_INCLUDED
 
-#include "types.cuh"
-#include "port/port.cuh"
+#include "common.cuh"
+#include "port.cuh"
 #include "pair.cuh"
 
 // Given two tags, gets their interaction rule. Uses a u64mask lookup table.
diff --git a/src/cuda/show.cuh b/src/cuda/show.cuh
index 940e9bbd..1ef5b659 100644
--- a/src/cuda/show.cuh
+++ b/src/cuda/show.cuh
@@ -1,7 +1,10 @@
+// Utilities for converting some structures to strings, or printing them out.
+// These are useful for debugging and for printing the result of a reduction.
+
 #ifndef show_cuh_INCLUDED
 #define show_cuh_INCLUDED
 
-#include "port/numb.cuh"
+#include "numb.cuh"
 #include "pair.cuh"
 #include "structs.cuh"
 #include <string.h>
@@ -45,7 +48,7 @@ __device__ __host__ Show show_port(Port port) {
   return s;
 }
 
-__device__ Show show_rule(Rule rule) {
+__device__ __host__ Show show_rule(Rule rule) {
   Show s;
   switch (rule) {
     case LINK: memcpy(s.x, "LINK", 4); break;
diff --git a/src/cuda/structs.cuh b/src/cuda/structs.cuh
index 5af44921..3af46722 100644
--- a/src/cuda/structs.cuh
+++ b/src/cuda/structs.cuh
@@ -1,7 +1,7 @@
 #ifndef structs_cuh_INCLUDED
 #define structs_cuh_INCLUDED
 
-#include "port/port.cuh"
+#include "port.cuh"
 #include "rule.cuh"
 #include "config.cuh"
 #include "constants.cuh"
@@ -104,238 +104,4 @@ struct Net {
   u32  *g_vars_put; // next global vars allocation index
 };
 
-// Redex Bag
-// ---------
-
-__device__ RBag rbag_new() {
-  RBag rbag;
-  rbag.hi_end = 0;
-  rbag.lo_end = 0;
-  return rbag;
-}
-
-__device__ u32 rbag_len(RBag* rbag) {
-  return rbag->hi_end + rbag->lo_end;
-}
-
-__device__ u32 rbag_has_highs(RBag* rbag) {
-  return rbag->hi_end > 0;
-}
-
-__device__ void push_redex(TM* tm, Pair redex) {
-  #ifdef DEBUG
-  bool free_hi = tm->rbag.hi_end < RLEN;
-  bool free_lo = tm->rbag.lo_end < RLEN;
-  if (!free_hi || !free_lo) {
-    debug("push_redex: limited resources, maybe corrupting memory\n");
-  }
-  #endif
-
-  Rule rule = get_pair_rule(redex);
-  if (is_high_priority(rule)) {
-    tm->rbag.hi_buf[tm->rbag.hi_end++] = redex;
-  } else {
-    tm->rbag.lo_buf[tm->rbag.lo_end++] = redex;
-  }
-}
-
-__device__ Pair pop_redex(TM* tm) {
-  if (tm->rbag.hi_end > 0) {
-    return tm->rbag.hi_buf[(--tm->rbag.hi_end) % RLEN];
-  } else if (tm->rbag.lo_end > 0) {
-    return tm->rbag.lo_buf[(--tm->rbag.lo_end) % RLEN];
-  } else {
-    return 0;
-  }
-}
-
-// Sets the initial redex.
-__global__ void boot_redex(GNet* gnet, Pair redex) {
-  // Creates root variable.
-  gnet->vars_buf[get_val(ROOT)] = NONE;
-  // Creates root redex.
-  if (gnet->turn % 2 == 0) {
-    gnet->rbag_buf_A[0] = redex;
-  } else {
-    gnet->rbag_buf_B[0] = redex;
-  }
-}
-
-// TM
-// --
-
-__device__ TM tmem_new() {
-  TM tm;
-  tm.rbag = rbag_new();
-  tm.nput = 1;
-  tm.vput = 1;
-  tm.mode = SEED;
-  tm.itrs = 0;
-  tm.leak = 0;
-  return tm;
-}
-
-// Net
-// ----
-
-__device__ Net vnet_new(GNet* gnet, void* smem, u32 turn) {
-  Net net;
-  net.l_node_dif   = 0;
-  net.l_vars_dif   = 0;
-  net.l_node_buf   = smem == NULL ? net.l_node_buf : ((LNet*)smem)->node_buf;
-  net.l_vars_buf   = smem == NULL ? net.l_vars_buf : ((LNet*)smem)->vars_buf;
-  net.g_rbag_use_A = turn % 2 == 0 ? &gnet->rbag_use_A : &gnet->rbag_use_B;
-  net.g_rbag_use_B = turn % 2 == 0 ? &gnet->rbag_use_B : &gnet->rbag_use_A;
-  net.g_rbag_buf_A = turn % 2 == 0 ? gnet->rbag_buf_A : gnet->rbag_buf_B;
-  net.g_rbag_buf_B = turn % 2 == 0 ? gnet->rbag_buf_B : gnet->rbag_buf_A;
-  net.g_node_buf   = gnet->node_buf;
-  net.g_vars_buf   = gnet->vars_buf;
-  net.g_node_put   = &gnet->node_put[GID()];
-  net.g_vars_put   = &gnet->vars_put[GID()];
-  return net;
-}
-
-// Stores a new node on global.
-__device__ inline void node_create(Net* net, u32 loc, Pair val) {
-  Pair old;
-  if (loc < L_NODE_LEN) {
-    net->l_node_dif += 1;
-    old = atomicExch(&net->l_node_buf[loc], val);
-  } else {
-    old = atomicExch(&net->g_node_buf[loc], val);
-  }
-  #ifdef DEBUG
-  if (old != 0) printf("[%04x] ERR NODE_CREATE | %04x\n", GID(), loc);
-  #endif
-}
-
-// Stores a var on global.
-__device__ inline void vars_create(Net* net, u32 var, Port val) {
-  Port old;
-  if (var < L_VARS_LEN) {
-    net->l_vars_dif += 1;
-    old = atomicExch(&net->l_vars_buf[var], val);
-  } else {
-    old = atomicExch(&net->g_vars_buf[var], val);
-  }
-  #ifdef DEBUG
-  if (old != 0) printf("[%04x] ERR VARS_CREATE | %04x\n", GID(), var);
-  #endif
-}
-
-// Reads a node from global.
-__device__ __host__ inline Pair node_load(Net* net, u32 loc) {
-  Pair got;
-  if (loc < L_NODE_LEN) {
-    got = net->l_node_buf[loc];
-  } else {
-    got = net->g_node_buf[loc];
-  }
-  return got;
-}
-
-// Reads a var from global.
-__device__ __host__ inline Port vars_load(Net* net, u32 var) {
-  Port got;
-  if (var < L_VARS_LEN) {
-    got = net->l_vars_buf[var];
-  } else {
-    got = net->g_vars_buf[var];
-  }
-  return got;
-}
-
-// Exchanges a node on global by a value. Returns old.
-__device__ inline Pair node_exchange(Net* net, u32 loc, Pair val) {
-  Pair got = 0;
-  if (loc < L_NODE_LEN) {
-    got = atomicExch(&net->l_node_buf[loc], val);
-  } else {
-    got = atomicExch(&net->g_node_buf[loc], val);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR NODE_EXCHANGE | %04x\n", GID(), loc);
-  #endif
-  return got;
-}
-
-// Exchanges a var on global by a value. Returns old.
-__device__ inline Port vars_exchange(Net* net, u32 var, Port val) {
-  Port got = 0;
-  if (var < L_VARS_LEN) {
-    got = atomicExch(&net->l_vars_buf[var], val);
-  } else {
-    got = atomicExch(&net->g_vars_buf[var], val);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR VARS_EXCHANGE | %04x\n", GID(), var);
-  #endif
-  return got;
-}
-
-// Takes a node.
-__device__ inline Pair node_take(Net* net, u32 loc) {
-  Pair got = 0;
-  if (loc < L_NODE_LEN) {
-    net->l_node_dif -= 1;
-    got = atomicExch(&net->l_node_buf[loc], 0);
-  } else {
-    got = atomicExch(&net->g_node_buf[loc], 0);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR NODE_TAKE | %04x\n", GID(), loc);
-  #endif
-  return got;
-}
-
-// Takes a var.
-__device__ inline Port vars_take(Net* net, u32 var) {
-  Port got = 0;
-  if (var < L_VARS_LEN) {
-    net->l_vars_dif -= 1;
-    got = atomicExch(&net->l_vars_buf[var], 0);
-  } else {
-    got = atomicExch(&net->g_vars_buf[var], 0);
-  }
-  #ifdef DEBUG
-  if (got == 0) printf("[%04x] ERR VARS_TAKE | %04x\n", GID(), var);
-  #endif
-  return got;
-}
-
-// Finds a variable's value.
-__device__ inline Port peek(Net* net, Port var) {
-  while (get_tag(var) == VAR) {
-    Port val = vars_load(net, get_val(var));
-    if (val == NONE) break;
-    if (val == 0) break;
-    var = val;
-  }
-  return var;
-}
-
-// Finds a variable's value.
-__device__ inline Port enter(Net* net, Port var) {
-  u32 lps = 0;
-  Port init = var;
-  // While `B` is VAR: extend it (as an optimization)
-  while (get_tag(var) == VAR) {
-    // Takes the current `var` substitution as `val`
-    Port val = vars_exchange(net, get_val(var), NONE);
-    // If there was no `val`, stop, as there is no extension
-    if (val == NONE) {
-      break;
-    }
-    // Sanity check: if global A is unfilled, stop
-    if (val == 0) {
-      break;
-    }
-    // Otherwise, delete `B` (we own both) and continue
-    vars_take(net, get_val(var));
-    //if (++lps > 65536) printf("[%04x] BUG A | init=%s var=%s val=%s\n", GID(), show_port(init).x, show_port(var).x, show_port(val).x);
-    var = val;
-  }
-  return var;
-}
-
 #endif // structs_cuh_INCLUDED
diff --git a/src/cuda/structs/book.cuh b/src/cuda/structs/book.cuh
new file mode 100644
index 00000000..4f0e7b59
--- /dev/null
+++ b/src/cuda/structs/book.cuh
@@ -0,0 +1,56 @@
+#ifndef structs_book_cuh_INCLUDED
+#define structs_book_cuh_INCLUDED
+
+#include "../structs.cuh"
+
+// Loads a compiled book buffer `buf` into `book`.
+bool book_load(Book* book, u32* buf) {
+  // Reads defs_len
+  book->defs_len = *buf++;
+
+  // Parses each def
+  for (u32 i = 0; i < book->defs_len; ++i) {
+    // Reads fid
+    u32 fid = *buf++;
+
+    // Gets def
+    Def* def = &book->defs_buf[fid];
+
+    // Reads name
+    memcpy(def->name, buf, 256);
+    buf += 64;
+
+    // Reads safe flag
+    def->safe = *buf++;
+
+    // Reads lengths
+    def->rbag_len = *buf++;
+    def->node_len = *buf++;
+    def->vars_len = *buf++;
+
+    if (def->rbag_len > L_NODE_LEN/TPB) {
+      fprintf(stderr, "def '%s' has too many redexes: %u\n", def->name, def->rbag_len);
+      return false;
+    }
+
+    if (def->node_len > L_NODE_LEN/TPB) {
+      fprintf(stderr, "def '%s' has too many nodes: %u\n", def->name, def->node_len);
+      return false;
+    }
+
+    // Reads root
+    def->root = *buf++;
+
+    // Reads rbag_buf
+    memcpy(def->rbag_buf, buf, 8*def->rbag_len);
+    buf += def->rbag_len * 2;
+
+    // Reads node_buf
+    memcpy(def->node_buf, buf, 8*def->node_len);
+    buf += def->node_len * 2;
+  }
+
+  return true;
+}
+
+#endif // structs_book_cuh_INCLUDED
diff --git a/src/cuda/structs/gnet.cuh b/src/cuda/structs/gnet.cuh
new file mode 100644
index 00000000..af0a5c53
--- /dev/null
+++ b/src/cuda/structs/gnet.cuh
@@ -0,0 +1,135 @@
+#ifndef structs_gnet_cuh_INCLUDED
+#define structs_gnet_cuh_INCLUDED
+
+#include "../structs.cuh"
+
+// Initializes the GNet
+__global__ void initialize(GNet* gnet) {
+  gnet->node_put[GID()] = 0;
+  gnet->vars_put[GID()] = 0;
+  gnet->rbag_pos[GID()] = 0;
+  for (u32 i = 0; i < RLEN; ++i) {
+    gnet->rbag_buf_A[G_RBAG_LEN / TPG * GID() + i] = 0;
+  }
+  for (u32 i = 0; i < RLEN; ++i) {
+    gnet->rbag_buf_B[G_RBAG_LEN / TPG * GID() + i] = 0;
+  }
+}
+
+GNet* gnet_create() {
+  GNet *gnet;
+  cudaMalloc((void**)&gnet, sizeof(GNet));
+  initialize<<<BPG, TPB>>>(gnet);
+  //cudaMemset(gnet, 0, sizeof(GNet));
+  return gnet;
+}
+
+__global__ void gnet_inbetween(GNet* gnet) {
+  // Clears rbag use counter
+  if (gnet->turn % 2 == 0) {
+    gnet->rbag_use_A = 0;
+  } else {
+    gnet->rbag_use_B = 0;
+  }
+
+  // Increments gnet turn
+  gnet->turn += 1;
+
+  // Increments interaction counter
+  gnet->itrs += gnet->iadd;
+
+  // Resets the rdec variable
+  gnet->rdec = 0;
+
+  // Moves to next mode
+  if (!gnet->down) {
+    gnet->mode = min(gnet->mode + 1, WORK);
+  }
+
+  // If no work was done...
+  if (gnet->iadd == 0) {
+    // If on seed mode, go up to GROW mode
+    if (gnet->mode == SEED) {
+      gnet->mode = GROW;
+      gnet->down = 0;
+    // Otherwise, go down to SEED mode
+    } else {
+      gnet->mode = SEED;
+      gnet->down = 1;
+      gnet->rdec = 1; // peel one rpos
+    }
+    //printf(">> CHANGE MODE TO %d | %d <<\n", gnet->mode, gnet->down);
+  }
+
+  // Reset interaction adder
+  gnet->iadd = 0;
+}
+
+u32 gnet_get_rlen(GNet* gnet, u32 turn) {
+  u32 rbag_use;
+  if (turn % 2 == 0) {
+    cudaMemcpy(&rbag_use, &gnet->rbag_use_B, sizeof(u32), cudaMemcpyDeviceToHost);
+  } else {
+    cudaMemcpy(&rbag_use, &gnet->rbag_use_A, sizeof(u32), cudaMemcpyDeviceToHost);
+  }
+  return rbag_use;
+}
+
+u64 gnet_get_itrs(GNet* gnet) {
+  u64 itrs;
+  cudaMemcpy(&itrs, &gnet->itrs, sizeof(u64), cudaMemcpyDeviceToHost);
+  return itrs;
+}
+
+u64 gnet_get_leak(GNet* gnet) {
+  u64 leak;
+  cudaMemcpy(&leak, &gnet->leak, sizeof(u64), cudaMemcpyDeviceToHost);
+  return leak;
+}
+
+// Reads a device node to host
+Pair gnet_node_load(GNet* gnet, u32 loc) {
+  Pair pair;
+  cudaMemcpy(&pair, &gnet->node_buf[loc], sizeof(Pair), cudaMemcpyDeviceToHost);
+  return pair;
+}
+
+// Reads a device var to host
+Port gnet_vars_load(GNet* gnet, u32 loc) {
+  Pair port;
+  cudaMemcpy(&port, &gnet->vars_buf[loc], sizeof(Port), cudaMemcpyDeviceToHost);
+  return port;
+}
+
+// Writes a host var to device
+void gnet_vars_create(GNet* gnet, u32 var, Port val) {
+  cudaMemcpy(&gnet->vars_buf[var], &val, sizeof(Port), cudaMemcpyHostToDevice);
+}
+
+// Like the enter() function, but from host and read-only
+Port gnet_peek(GNet* gnet, Port port) {
+  while (get_tag(port) == VAR) {
+    Port val = gnet_vars_load(gnet, get_val(port));
+    if (val == NONE) break;
+    port = val;
+  }
+  return port;
+}
+
+// Sets the initial redex.
+__global__ void boot_redex(GNet* gnet, Pair redex) {
+  // Creates root variable.
+  gnet->vars_buf[get_val(ROOT)] = NONE;
+  // Creates root redex.
+  if (gnet->turn % 2 == 0) {
+    gnet->rbag_buf_A[0] = redex;
+  } else {
+    gnet->rbag_buf_B[0] = redex;
+  }
+}
+
+void gnet_boot_redex(GNet* gnet, Pair redex) {
+  boot_redex<<<BPG, TPB>>>(gnet, redex);
+}
+
+#endif // structs_gnet_cuh_INCLUDED
diff --git a/src/cuda/structs/rbag.cuh b/src/cuda/structs/rbag.cuh
new file mode 100644
index 00000000..9a804387
--- /dev/null
+++ b/src/cuda/structs/rbag.cuh
@@ -0,0 +1,48 @@
+#ifndef structs_rbag_cuh_INCLUDED
+#define structs_rbag_cuh_INCLUDED
+
+#include "../structs.cuh"
+
+__device__ RBag rbag_new() {
+  RBag rbag;
+  rbag.hi_end = 0;
+  rbag.lo_end = 0;
+  return rbag;
+}
+
+__device__ u32 rbag_len(RBag* rbag) {
+  return rbag->hi_end + rbag->lo_end;
+}
+
+__device__ u32 rbag_has_highs(RBag* rbag) {
+  return rbag->hi_end > 0;
+}
+
+__device__ void push_redex(TM* tm, Pair redex) {
+  #ifdef DEBUG
+  bool free_hi = tm->rbag.hi_end < RLEN;
+  bool free_lo = tm->rbag.lo_end < RLEN;
+  if (!free_hi || !free_lo) {
+    debug("push_redex: limited resources, maybe corrupting memory\n");
+  }
+  #endif
+
+  Rule rule = get_pair_rule(redex);
+  if (is_high_priority(rule)) {
+    tm->rbag.hi_buf[tm->rbag.hi_end++] = redex;
+  } else {
+    tm->rbag.lo_buf[tm->rbag.lo_end++] = redex;
+  }
+}
+
+__device__ Pair pop_redex(TM* tm) {
+  if (tm->rbag.hi_end > 0) {
+    return tm->rbag.hi_buf[(--tm->rbag.hi_end) % RLEN];
+  } else if (tm->rbag.lo_end > 0) {
+    return tm->rbag.lo_buf[(--tm->rbag.lo_end) % RLEN];
+  } else {
+    return 0;
+  }
+}
+
+#endif // structs_rbag_cuh_INCLUDED
diff --git a/src/cuda/structs/tm.cuh b/src/cuda/structs/tm.cuh
new file mode 100644
index 00000000..11520c43
--- /dev/null
+++ b/src/cuda/structs/tm.cuh
@@ -0,0 +1,18 @@
+#ifndef structs_tm_cuh_INCLUDED
+#define structs_tm_cuh_INCLUDED
+
+#include "../structs.cuh"
+#include "rbag.cuh"
+
+__device__ TM tmem_new() {
+  TM tm;
+  tm.rbag = rbag_new();
+  tm.nput = 1;
+  tm.vput = 1;
+  tm.mode = SEED;
+  tm.itrs = 0;
+  tm.leak = 0;
+  return tm;
+}
+
+#endif // structs_tm_cuh_INCLUDED
diff --git a/src/cuda/structs/vnet.cuh b/src/cuda/structs/vnet.cuh
new file mode 100644
index 00000000..40cbd451
--- /dev/null
+++ b/src/cuda/structs/vnet.cuh
@@ -0,0 +1,166 @@
+#ifndef structs_vnet_cuh_INCLUDED
+#define structs_vnet_cuh_INCLUDED
+
+#include "../structs.cuh"
+
+__device__ Net vnet_new(GNet* gnet, void* smem, u32 turn) {
+  Net net;
+  net.l_node_dif   = 0;
+  net.l_vars_dif   = 0;
+  net.l_node_buf   = smem == NULL ? net.l_node_buf : ((LNet*)smem)->node_buf;
+  net.l_vars_buf   = smem == NULL ? net.l_vars_buf : ((LNet*)smem)->vars_buf;
+  net.g_rbag_use_A = turn % 2 == 0 ? &gnet->rbag_use_A : &gnet->rbag_use_B;
+  net.g_rbag_use_B = turn % 2 == 0 ? &gnet->rbag_use_B : &gnet->rbag_use_A;
+  net.g_rbag_buf_A = turn % 2 == 0 ? gnet->rbag_buf_A : gnet->rbag_buf_B;
+  net.g_rbag_buf_B = turn % 2 == 0 ? gnet->rbag_buf_B : gnet->rbag_buf_A;
+  net.g_node_buf   = gnet->node_buf;
+  net.g_vars_buf   = gnet->vars_buf;
+  net.g_node_put   = &gnet->node_put[GID()];
+  net.g_vars_put   = &gnet->vars_put[GID()];
+  return net;
+}
+
+// Stores a new node on global.
+__device__ inline void node_create(Net* net, u32 loc, Pair val) {
+  Pair old;
+  if (loc < L_NODE_LEN) {
+    net->l_node_dif += 1;
+    old = atomicExch(&net->l_node_buf[loc], val);
+  } else {
+    old = atomicExch(&net->g_node_buf[loc], val);
+  }
+  #ifdef DEBUG
+  if (old != 0) printf("[%04x] ERR NODE_CREATE | %04x\n", GID(), loc);
+  #endif
+}
+
+// Stores a var on global.
+__device__ inline void vars_create(Net* net, u32 var, Port val) {
+  Port old;
+  if (var < L_VARS_LEN) {
+    net->l_vars_dif += 1;
+    old = atomicExch(&net->l_vars_buf[var], val);
+  } else {
+    old = atomicExch(&net->g_vars_buf[var], val);
+  }
+  #ifdef DEBUG
+  if (old != 0) printf("[%04x] ERR VARS_CREATE | %04x\n", GID(), var);
+  #endif
+}
+
+// Reads a node from global.
+__device__ __host__ inline Pair node_load(Net* net, u32 loc) {
+  Pair got;
+  if (loc < L_NODE_LEN) {
+    got = net->l_node_buf[loc];
+  } else {
+    got = net->g_node_buf[loc];
+  }
+  return got;
+}
+
+// Reads a var from global.
+__device__ __host__ inline Port vars_load(Net* net, u32 var) {
+  Port got;
+  if (var < L_VARS_LEN) {
+    got = net->l_vars_buf[var];
+  } else {
+    got = net->g_vars_buf[var];
+  }
+  return got;
+}
+
+// Exchanges a node on global by a value. Returns old.
+__device__ inline Pair node_exchange(Net* net, u32 loc, Pair val) {
+  Pair got = 0;
+  if (loc < L_NODE_LEN) {
+    got = atomicExch(&net->l_node_buf[loc], val);
+  } else {
+    got = atomicExch(&net->g_node_buf[loc], val);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR NODE_EXCHANGE | %04x\n", GID(), loc);
+  #endif
+  return got;
+}
+
+// Exchanges a var on global by a value. Returns old.
+__device__ inline Port vars_exchange(Net* net, u32 var, Port val) {
+  Port got = 0;
+  if (var < L_VARS_LEN) {
+    got = atomicExch(&net->l_vars_buf[var], val);
+  } else {
+    got = atomicExch(&net->g_vars_buf[var], val);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR VARS_EXCHANGE | %04x\n", GID(), var);
+  #endif
+  return got;
+}
+
+// Takes a node.
+__device__ inline Pair node_take(Net* net, u32 loc) {
+  Pair got = 0;
+  if (loc < L_NODE_LEN) {
+    net->l_node_dif -= 1;
+    got = atomicExch(&net->l_node_buf[loc], 0);
+  } else {
+    got = atomicExch(&net->g_node_buf[loc], 0);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR NODE_TAKE | %04x\n", GID(), loc);
+  #endif
+  return got;
+}
+
+// Takes a var.
+__device__ inline Port vars_take(Net* net, u32 var) {
+  Port got = 0;
+  if (var < L_VARS_LEN) {
+    net->l_vars_dif -= 1;
+    got = atomicExch(&net->l_vars_buf[var], 0);
+  } else {
+    got = atomicExch(&net->g_vars_buf[var], 0);
+  }
+  #ifdef DEBUG
+  if (got == 0) printf("[%04x] ERR VARS_TAKE | %04x\n", GID(), var);
+  #endif
+  return got;
+}
+
+// Finds a variable's value.
+__device__ inline Port peek(Net* net, Port var) {
+  while (get_tag(var) == VAR) {
+    Port val = vars_load(net, get_val(var));
+    if (val == NONE) break;
+    if (val == 0) break;
+    var = val;
+  }
+  return var;
+}
+
+// Finds a variable's value.
+__device__ inline Port enter(Net* net, Port var) {
+  u32 lps = 0;
+  Port init = var;
+  // While `B` is VAR: extend it (as an optimization)
+  while (get_tag(var) == VAR) {
+    // Takes the current `var` substitution as `val`
+    Port val = vars_exchange(net, get_val(var), NONE);
+    // If there was no `val`, stop, as there is no extension
+    if (val == NONE) {
+      break;
+    }
+    // Sanity check: if global A is unfilled, stop
+    if (val == 0) {
+      break;
+    }
+    // Otherwise, delete `B` (we own both) and continue
+    vars_take(net, get_val(var));
+    //if (++lps > 65536) printf("[%04x] BUG A | init=%s var=%s val=%s\n", GID(), show_port(init).x, show_port(var).x, show_port(val).x);
+    var = val;
+  }
+  return var;
+}
+
+#endif // structs_vnet_cuh_INCLUDED
diff --git a/src/cuda/sync.cuh b/src/cuda/sync.cuh
new file mode 100644
index 00000000..7b8533fd
--- /dev/null
+++ b/src/cuda/sync.cuh
@@ -0,0 +1,90 @@
+// Synchronization utilities and debugging functions.
+
+#ifndef sync_cuh_INCLUDED
+#define sync_cuh_INCLUDED
+
+#include "config.cuh"
+
+// Returns true if all 'x' are true, block-wise
+__device__ __noinline__ bool block_all(bool x) {
+  __shared__ bool res;
+  if (TID() == 0) res = true;
+  __syncthreads();
+  if (!x) res = false;
+  __syncthreads();
+  return res;
+}
+
+// Returns true if any 'x' is true, block-wise
+__device__ __noinline__ bool block_any(bool x) {
+  __shared__ bool res;
+  if (TID() == 0) res = false;
+  __syncthreads();
+  if (x) res = true;
+  __syncthreads();
+  return res;
+}
+
+// Returns the sum of a value, block-wise
+template <typename A>
+__device__ __noinline__ A block_sum(A x) {
+  __shared__ A res;
+  if (TID() == 0) res = 0;
+  __syncthreads();
+  atomicAdd(&res, x);
+  __syncthreads();
+  return res;
+}
+
+// Returns the sum of a boolean, block-wise
+__device__ __noinline__ u32 block_count(bool x) {
+  __shared__ u32 res;
+  if (TID() == 0) res = 0;
+  __syncthreads();
+  atomicAdd(&res, x);
+  __syncthreads();
+  return res;
+}
+
+// Prints a 4-bit value for each thread in a block
+__device__ void block_print(u32 x) {
+  __shared__ u8 value[TPB];
+
+  value[TID()] = x;
+  __syncthreads();
+
+  if (TID() == 0) {
+    for (u32 i = 0; i < TPB; ++i) {
+      printf("%x", min(value[i],0xF));
+    }
+  }
+  __syncthreads();
+}
+
+__device__ u32 NODE_COUNT;
+__device__ u32 VARS_COUNT;
+
+__global__ void count_memory(GNet* gnet) {
+  u32 node_count = 0;
+  u32 vars_count = 0;
+  for (u32 i = GID(); i < G_NODE_LEN; i += TPG) {
+    if (gnet->node_buf[i] != 0) ++node_count;
+    if (gnet->vars_buf[i] != 0) ++vars_count;
+  }
+
+  __shared__ u32 block_node_count;
+  __shared__ u32 block_vars_count;
+
+  if (TID() == 0) block_node_count = 0;
+  if (TID() == 0) block_vars_count = 0;
+  __syncthreads();
+
+  atomicAdd(&block_node_count, node_count);
+  atomicAdd(&block_vars_count, vars_count);
+  __syncthreads();
+
+  if (TID() == 0) atomicAdd(&NODE_COUNT, block_node_count);
+  if (TID() == 0) atomicAdd(&VARS_COUNT, block_vars_count);
+}
+
+#endif // sync_cuh_INCLUDED
diff --git a/src/cuda/types.cuh b/src/cuda/types.cuh
deleted file mode 100644
index 3f0d9cf5..00000000
--- a/src/cuda/types.cuh
+++ /dev/null
@@ -1,58 +0,0 @@
-#ifndef types_cuh_INCLUDED
-#define types_cuh_INCLUDED
-
-#include "common.cuh"
-#include "config.cuh"
-
-// Values
-// ------
-// Val ::= 29-bit (rounded up to u32)
-// The 29 least significant bits in a Port
-typedef u32 Val;
-
-// Tags
-// ----
-// Tag ::= 3-bit (rounded up to u8)
-// The 3 most significant bits in a Port.
-typedef u8 Tag;
-
-const Tag VAR = 0x0; // variable
-const Tag REF = 0x1; // reference
-const Tag ERA = 0x2; // eraser
-const Tag NUM = 0x3; // number
-const Tag CON = 0x4; // constructor
-const Tag DUP = 0x5; // duplicator
-const Tag OPR = 0x6; // operator
-const Tag SWI = 0x7; // switch
-
-// Ports
-// -----
-// Port ::= Tag + Val (fits a u32)
-typedef u32 Port;
-
-/// Pair
-/// ----
-// Pair ::= Port + Port (fits a u64)
-typedef u64 Pair;
-
-// Interaction Rules
-// -----------------
-// Rule ::= 3-bit (rounded up to 8)
-typedef u8 Rule;
-
-const Rule LINK = 0x0;
-const Rule CALL = 0x1;
-const Rule VOID = 0x2;
-const Rule ERAS = 0x3;
-const Rule ANNI = 0x4;
-const Rule COMM = 0x5;
-const Rule OPER = 0x6;
-const Rule SWIT = 0x7;
-
-// Numbs
-// -----
-// Numb ::= 29-bit (rounded up to u32)
-// One of the 8 possible kinds of values of a port.
-typedef u32 Numb;
-
-#endif // types_cuh_INCLUDED

From 084a2ee0287b6ac708ff8c40139b2899d94278a2 Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Mon, 26 Aug 2024 17:16:27 +0200
Subject: [PATCH 5/7] split out evaluator

---
 src/cuda/evaluator.cuh              | 339 ++++++++++++
 src/cuda/evaluator/interactions.cuh | 380 +++++++++++++
 src/cuda/hvm.cu                     | 828 ----------------------------
 src/cuda/hvm.cuh                    |  94 ++++
 src/cuda/main.cu                    |  18 +
 5 files changed, 831 insertions(+), 828 deletions(-)
 create mode 100644 src/cuda/evaluator.cuh
 create mode 100644 src/cuda/evaluator/interactions.cuh
 delete mode 100644 src/cuda/hvm.cu
 create mode 100644 src/cuda/hvm.cuh
 create mode 100644 src/cuda/main.cu

diff --git a/src/cuda/evaluator.cuh b/src/cuda/evaluator.cuh
new file mode 100644
index 00000000..1561b585
--- /dev/null
+++ b/src/cuda/evaluator.cuh
@@ -0,0 +1,339 @@
+#ifndef evaluator_cuh_INCLUDED
+#define evaluator_cuh_INCLUDED
+
+#include "evaluator/interactions.cuh"
+#include "structs/gnet.cuh"
+#include "structs/tm.cuh"
+#include "sync.cuh"
+
+// Transposes an index over a matrix.
+__device__ u32 transpose(u32 idx, u32 width, u32 height) {
+  u32 old_row = idx / width;
+  u32 old_col = idx % width;
+  u32 new_row = old_col % height;
+  u32 new_col = old_col / height + old_row * (width / height);
+  return new_row * width + new_col;
+}
+
+
+// Moves redexes from shared memory to global bag
+__device__ void save_redexes(Net* net, TM *tm, u32 turn) {
+  u32 idx = 0;
+  u32 bag = tm->mode == SEED ? transpose(GID(), TPB, BPG) : GID();
+
+  // Leaks low-priority redexes
+  for (u32 i = 0; i < tm->rbag.lo_end; ++i) {
+    Pair R = tm->rbag.lo_buf[i % RLEN];
+    Port x = get_fst(R);
+    Port y = get_snd(R);
+    Port X = new_port(VAR, g_vars_alloc_1(net));
+    Port Y = new_port(VAR, g_vars_alloc_1(net));
+    vars_create(net, get_val(X), NONE);
+    vars_create(net, get_val(Y), NONE);
+    link_pair(net, tm, new_pair(X, x));
+    link_pair(net, tm, new_pair(Y, y));
+    net->g_rbag_buf_B[bag * RLEN + (idx++)] = new_pair(X, Y);
+  }
+  __syncthreads();
+  tm->rbag.lo_end = 0;
+
+  // Executes all high-priority redexes
+  while (rbag_has_highs(&tm->rbag)) {
+    Pair redex = pop_redex(tm);
+    if (!interact(net, tm, redex, turn)) {
+      printf("ERROR: failed to clear high-priority redexes");
+    }
+  }
+  __syncthreads();
+
+  #ifdef DEBUG
+  if (rbag_len(&tm->rbag) > 0) printf("[%04x] ERR SAVE_REDEXES lo=%d hi=%d tot=%d\n", GID(), tm->rbag.lo_end, tm->rbag.hi_end, rbag_len(&tm->rbag));
+  #endif
+
+  // Updates global redex counter
+  atomicAdd(net->g_rbag_use_B, idx);
+}
+
+// Loads redexes from global bag to shared memory
+// FIXME: check if we have enuogh space for all loads
+__device__ void load_redexes(Net* net, TM *tm, u32 turn) {
+  u32 gid = BID() * TPB + TID();
+  u32 bag = tm->mode == SEED ? transpose(GID(), TPB, BPG) : GID();
+  for (u32 i = 0; i < RLEN; ++i) {
+    Pair redex = atomicExch(&net->g_rbag_buf_A[bag * RLEN + i], 0);
+    if (redex != 0) {
+      Port a = enter(net, get_fst(redex));
+      Port b = enter(net, get_snd(redex));
+      #ifdef DEBUG
+      if (is_local(a) || is_local(b)) printf("[%04x] ERR LOAD_REDEXES\n", turn);
+      #endif
+      push_redex(tm, new_pair(a, b));
+    } else {
+      break;
+    }
+  }
+  __syncthreads();
+}
+
+// Kernels
+// -------
+
+// EVAL
+__global__ void evaluator(GNet* gnet) {
+  extern __shared__ char shared_mem[]; // 96 KB
+  __shared__ Pair spawn[TPB]; // thread initialized
+
+  // Thread Memory
+  TM tm = tmem_new();
+
+  // Net (Local-Global View)
+  Net net = vnet_new(gnet, shared_mem, gnet->turn);
+
+  // Clears shared memory
+  for (u32 i = 0; i < L_NODE_LEN / TPB; ++i) {
+    net.l_node_buf[i * TPB + TID()] = 0;
+    net.l_vars_buf[i * TPB + TID()] = 0;
+  }
+  __syncthreads();
+
+  // Sets mode
+  tm.mode = gnet->mode;
+
+  // Loads Redexes
+  load_redexes(&net, &tm, gnet->turn);
+
+  // Clears spawn buffer
+  spawn[TID()] = rbag_len(&tm.rbag) > 0 ? 0xFFFFFFFFFFFFFFFF : 0;
+  __syncthreads();
+
+  // Variables
+  u64 INIT = clock64(); // initial time
+  u32 HASR = block_count(rbag_len(&tm.rbag) > 0);
+  u32 tick = 0;
+  u32 bag  = tm.mode == SEED ? transpose(GID(), TPB, BPG) : GID();
+  u32 rpos = gnet->rbag_pos[bag] > 0 ? gnet->rbag_pos[bag] - gnet->rdec : gnet->rbag_pos[bag];
+  u8  down = gnet->down;
+
+  //if (BID() == 0 && gnet->turn == 0x69) {
+    //printf("[%04x] ini rpos is %d | bag=%d\n", GID(), rpos, bag);
+  //}
+
+  // Aborts if empty
+  if (HASR == 0) {
+    return;
+  }
+
+  //if (BID() == 0 && rbag_len(&tm.rbag) > 0) {
+    //Pair redex = pop_redex(&tm);
+    //Pair kn = get_tag(get_snd(redex)) == CON ? node_load(&net, get_val(get_snd(redex))) : 0;
+    //printf("[%04x] HAS REDEX %s ~ %s | par? %d | (%s %s)\n",
+      //GID(),
+      //show_port(get_fst(redex)).x,
+      //show_port(get_snd(redex)).x,
+      //get_par_flag(redex),
+      //show_port(get_fst(kn)).x,
+      //show_port(get_snd(kn)).x);
+    //push_redex(&tm, redex);
+  //}
+
+  //// Display debug rbag
+  //if (GID() == 0) {
+    //print_rbag(&net, &tm);
+    //printf("| rbag_pos = %d | mode = %d | down = %d | turn = %04x\n", gnet->rbag_pos[bag], gnet->mode, down, gnet->turn);
+  //}
+  //__syncthreads();
+
+  // GROW MODE
+  // ---------
+
+  if (tm.mode == SEED || tm.mode == GROW) {
+    u32 tlim = tm.mode == SEED ? min(TPB_L2,BPG_L2) : max(TPB_L2,BPG_L2);
+    u32 span = 1 << (32 - __clz(TID()));
+
+    Pair redex;
+
+    for (u32 tick = 0; tick < tlim; ++tick) {
+      u32 span = 1 << tick;
+      u32 targ = TID() ^ span;
+
+      // Attempts to spawn a thread
+      if (TID() < span && spawn[targ] == 0) {
+        //if (BID() == 0) {
+          //if (!TID()) printf("----------------------------------------------------\n");
+          //if (!TID()) printf("TIC %04x | span=%d | rlen=%d | ", tick, span, rbag_len(&tm.rbag));
+          //block_print(rbag_len(&tm.rbag));
+          //if (!TID()) printf("\n");
+          //__syncthreads();
+        //}
+
+        // Performs some interactions until a parallel redex is found
+        for (u32 i = 0; i < 64; ++i) {
+          if (tm.rbag.lo_end < rpos) break;
+          redex = pop_redex(&tm);
+          if (redex == 0) {
+            break;
+          }
+          // If we found a stealable redex, pass it to stealing,
+          // and un-mark the redex above it, so we keep it for us.
+          if (get_par_flag(redex)) {
+            Pair above = pop_redex(&tm);
+            if (above != 0) {
+              push_redex(&tm, clr_par_flag(above));
+            }
+            break;
+          }
+          interact(&net, &tm, redex, gnet->turn);
+          redex = 0;
+          while (tm.rbag.hi_end > 0) {
+            if (!interact(&net, &tm, pop_redex(&tm), gnet->turn)) break;
+          }
+        }
+
+        // Spawn a thread
+        if (redex != 0 && get_par_flag(redex)) {
+          //if (BID() == 0) {
+            //Pair kn = get_tag(get_snd(redex)) == CON ? node_load(&net, get_val(get_snd(redex))) : 0;
+            //printf("[%04x] GIVE %s ~ %s | par? %d | (%s %s) | rbag.lo_end=%d\n", GID(), show_port(get_fst(redex)).x, show_port(get_snd(redex)).x, get_par_flag(redex), show_port(peek(&net, &tm, get_fst(kn))).x, show_port(peek(&net, &tm, get_snd(kn))).x, tm.rbag.lo_end);
+          //}
+
+          spawn[targ] = clr_par_flag(redex);
+          if (!down) {
+            rpos = tm.rbag.lo_end - 1;
+          }
+        }
+      }
+      __syncthreads();
+
+      // If we've been spawned, push initial redex
+      if (TID() >= span && TID() < span*2 && spawn[TID()] != 0 && spawn[TID()] != 0xFFFFFFFFFFFFFFFF) {
+        //if (rbag_len(&tm.rbag) > 0) {
+          //printf("[%04x] ERROR: SPAWNED BUT HAVE REDEX\n", GID());
+        //}
+
+        push_redex(&tm, atomicExch(&spawn[TID()], 0xFFFFFFFFFFFFFFFF));
+        rpos = 0;
+        //if (BID() == 0) printf("[%04x] TAKE %016llx\n", GID(), spawn[TID()]);
+      }
+      __syncthreads();
+
+      //if (BID() == 0) {
+        //if (!TID()) printf("TAC %04x | span=%d | rlen=%d | ", tick, span, rbag_len(&tm.rbag));
+        //block_print(rbag_len(&tm.rbag));
+        //if (!TID()) printf("\n");
+        //__syncthreads();
+      //}
+      //__syncthreads();
+
+      //printf("[%04x] span is %d\n", TID(), span);
+      //__syncthreads();
+    }
+
+    //if (BID() == 0 && gnet->turn == 0x69) {
+      //printf("[%04x] end rpos is %d | bag=%d\n", GID(), rpos, bag);
+    //}
+
+    gnet->rbag_pos[bag] = rpos;
+
+  }
+
+  // WORK MODE
+  // ---------
+
+  if (tm.mode == WORK) {
+    u32 chkt = 0;
+    u32 chka = 1;
+    u32 bag  = tm.mode == SEED ? transpose(GID(), TPB, BPG) : GID();
+    u32 rpos = gnet->rbag_pos[bag];
+    for (tick = 0; tick < 1 << 9; ++tick) {
+      if (tm.rbag.lo_end > rpos || rbag_has_highs(&tm.rbag)) {
+        if (interact(&net, &tm, pop_redex(&tm), gnet->turn)) {
+          while (rbag_has_highs(&tm.rbag)) {
+            if (!interact(&net, &tm, pop_redex(&tm), gnet->turn)) break;
+          }
+        }
+      }
+      __syncthreads();
+    }
+  }
+  __syncthreads();
+
+  //u32 ITRS = block_sum(tm.itrs);
+  //u32 LOOP = block_sum((u32)tick);
+  //u32 RLEN = block_sum(rbag_len(&tm.rbag));
+  //u32 FAIL = 0; // block_sum((u32)fail);
+  //f64 TIME = (f64)(clock64() - INIT) / (f64)S;
+  //f64 MIPS = (f64)ITRS / TIME / (f64)1000000.0;
+  ////if (BID() >= 0 && TID() == 0) {
+  //if (TID() == 0) {
+    //printf("%04x:[%02x]: MODE=%d DOWN=%d ITRS=%d LOOP=%d RLEN=%d FAIL=%d TIME=%f MIPS=%.0f | %d\n",
+      //gnet->turn, BID(), tm.mode, down, ITRS, LOOP, RLEN, FAIL, TIME, MIPS, 42);
+  //}
+  //__syncthreads();
+
+  // Display debug rbag
+  //if (BID() == 0) {
+    //for (u32 i = 0; i < TPB; ++i) {
+      //if (TID() == i && rbag_len(&tm.rbag) > 0) print_rbag(&net, &tm);
+      //__syncthreads();
+    //}
+    //__syncthreads();
+  //}
+
+  // Moves rbag to global
+  save_redexes(&net, &tm, gnet->turn);
+
+  // Stores rewrites
+  atomicAdd(&gnet->iadd, tm.itrs);
+  atomicAdd(&gnet->leak, tm.leak);
+
+}
+
+// GNet Host Functions
+// -------------------
+
+void gnet_normalize(GNet* gnet) {
+  // Invokes the Evaluator Kernel repeatedly
+  u32 turn;
+  u64 itrs = 0;
+  u32 rlen = 0;
+  // NORM
+  for (turn = 0; turn < 0xFFFFFFFF; ++turn) {
+    //printf("\e[1;1H\e[2J");
+    //printf("==================================================== ");
+    //printf("TURN: %04x | RLEN: %04x | ITRS: %012llu\n", turn, rlen, itrs);
+    //cudaDeviceSynchronize();
+
+    evaluator<<<BPG, TPB, sizeof(LNet)>>>(gnet);
+    gnet_inbetween<<<1, 1>>>(gnet);
+    //cudaDeviceSynchronize();
+
+    //count_memory<<<BPG, TPB>>>(gnet);
+    //cudaDeviceSynchronize();
+
+    //print_heatmap<<<1,1>>>(gnet, turn+1);
+    //cudaDeviceSynchronize();
+
+    itrs = gnet_get_itrs(gnet);
+    rlen = gnet_get_rlen(gnet, turn);
+    if (rlen == 0) {
+      //printf("Completed after %d kernel launches!\n", turn);
+      break;
+    }
+  }
+}
+
+// Expands a REF Port.
+Port gnet_expand(GNet* gnet, Port port) {
+  Port old = gnet_vars_load(gnet, get_val(ROOT));
+  Port got = gnet_peek(gnet, port);
+  //printf("expand %s\n", show_port(got).x);
+  while (get_tag(got) == REF) {
+    gnet_boot_redex(gnet, new_pair(got, ROOT));
+    gnet_normalize(gnet);
+    got = gnet_peek(gnet, gnet_vars_load(gnet, get_val(ROOT)));
+  }
+  gnet_vars_create(gnet, get_val(ROOT), old);
+  return got;
+}
+
+#endif // evaluator_cuh_INCLUDED
diff --git a/src/cuda/evaluator/interactions.cuh b/src/cuda/evaluator/interactions.cuh
new file mode 100644
index 00000000..579ba412
--- /dev/null
+++ b/src/cuda/evaluator/interactions.cuh
@@ -0,0 +1,380 @@
+#ifndef evaluator_interactions_cuh_INCLUDED
+#define evaluator_interactions_cuh_INCLUDED
+
+#include "alloc.cuh"
+#include "numb.cuh"
+#include "structs/rbag.cuh"
+#include "structs/gnet.cuh"
+
+// Linking
+// -------
+
+// Atomically Links `A ~ B`.
+__device__ void link(Net* net, TM* tm, Port A, Port B) {
+  #ifdef DEBUG
+  Port INI_A = A;
+  Port INI_B = B;
+  #endif
+
+  u32 lps = 0;
+
+  // Attempts to directionally point `A ~> B`
+  while (true) {
+
+    // If `A` is NODE: swap `A` and `B`, and continue
+    if (get_tag(A) != VAR && get_tag(B) == VAR) {
+      Port X = A; A = B; B = X;
+    }
+
+    // If `A` is NODE: create the `A ~ B` redex
+    if (get_tag(A) != VAR) {
+      //printf("[%04x] new redex A %s ~ %s\n", GID(), show_port(A).x, show_port(B).x);
+      push_redex(tm, new_pair(A, B)); // TODO: move global ports to local
+      break;
+    }
+
+    // While `B` is VAR: extend it (as an optimization)
+    B = enter(net, B);
+
+    // Since `A` is VAR: point `A ~> B`.
+    if (true) {
+      // If B would leak...
+      if (is_global(A) && is_local(B)) {
+        // If B is a var, just swap it
+        if (is_var(B)) {
+          Port X = A; A = B; B = X;
+          continue;
+        }
+        // If B is a nod, create a leak interaction
+        if (is_nod(B)) {
+          //if (!TID()) printf("[%04x] NODE LEAK %s ~ %s\n", GID(), show_port(A).x, show_port(B).x);
+          push_redex(tm, new_pair(A, B));
+          break;
+        }
+      }
+
+      // Sanity check: if global A is unfilled, delay this link
+      if (is_global(A) && vars_load(net, get_val(A)) == 0) {
+        push_redex(tm, new_pair(A, B));
+        break;
+      }
+
+      // Stores `A -> B`, taking the current `A` subst as `A'`
+      Port A_ = vars_exchange(net, get_val(A), B);
+
+      // If there was no `A'`, stop, as we lost B's ownership
+      if (A_ == NONE) {
+        break;
+      }
+
+      #ifdef DEBUG
+      if (A_ == 0) printf("[%04x] ERR LINK %s ~ %s | %s ~ %s\n", GID(), show_port(INI_A).x, show_port(INI_B).x, show_port(A).x, show_port(B).x);
+      #endif
+
+      // Otherwise, delete `A` (we own both) and link `A' ~ B`
+      vars_take(net, get_val(A));
+      A = A_;
+    }
+  }
+}
+
+// Links `A ~ B` (as a pair).
+__device__ void link_pair(Net* net, TM* tm, Pair AB) {
+  link(net, tm, get_fst(AB), get_snd(AB));
+}
+
+// Interactions
+// ------------
+
+// The Link Interaction.
+__device__ bool interact_link(Net* net, TM* tm, Port a, Port b) {
+  // If A is a global var and B is a local node, leak it:
+  // ^A ~ (b1 b2)
+  // ------------- LEAK-NODE
+  // ^X ~ b1
+  // ^Y ~ b2
+  // ^A ~ ^(^X ^Y)
+  if (is_global(a) && is_nod(b) && is_local(b)) {
+    // Allocates needed nodes and vars.
+    if (!get_resources(net, tm, 3, 0, 0)) {
+      return false;
+    }
+
+    tm->leak += 1;
+
+    // Loads ports.
+    Pair l_b  = node_take(net, get_val(b));
+    Port l_b1 = enter(net, get_fst(l_b));
+    Port l_b2 = enter(net, get_snd(l_b));
+
+    // Leaks port 1.
+    Port g_b1;
+    if (is_local(l_b1)) {
+      g_b1 = new_port(VAR, g_vars_alloc_1(net));
+      vars_create(net, get_val(g_b1), NONE);
+      link_pair(net, tm, new_pair(g_b1, l_b1));
+    } else {
+      g_b1 = l_b1;
+    }
+
+    // Leaks port 2.
+    Port g_b2;
+    if (is_local(l_b2)) {
+      g_b2 = new_port(VAR, g_vars_alloc_1(net));
+      vars_create(net, get_val(g_b2), NONE);
+      link_pair(net, tm, new_pair(g_b2, l_b2));
+    } else {
+      g_b2 = l_b2;
+    }
+
+    // Leaks node.
+    Port g_b = new_port(get_tag(b), g_node_alloc_1(net));
+    node_create(net, get_val(g_b), new_pair(g_b1, g_b2));
+    link_pair(net, tm, new_pair(a, g_b));
+
+    return true;
+
+  // Otherwise, just perform a normal link.
+  } else {
+    // Allocates needed nodes and vars.
+    if (!get_resources(net, tm, 1, 0, 0)) {
+      return false;
+    }
+
+    link_pair(net, tm, new_pair(a, b));
+  }
+
+  return true;
+}
+
+// The Void Interaction.
+__device__ bool interact_void(Net* net, TM* tm, Port a, Port b) {
+  return true;
+}
+
+// The Eras Interaction.
+__device__ bool interact_eras(Net* net, TM* tm, Port a, Port b) {
+  // Allocates needed nodes and vars.
+  if (!get_resources(net, tm, 2, 0, 0)) {
+    return false;
+  }
+
+  // Loads ports.
+  Pair B  = node_take(net, get_val(b));
+  Port B1 = get_fst(B);
+  Port B2 = get_snd(B);
+
+  // Links.
+  link_pair(net, tm, new_pair(a, B1));
+  link_pair(net, tm, new_pair(a, B2));
+
+  return true;
+}
+
+// The Call Interaction. In COMPILED mode, this interaction is
+// provided elsewhere.
+#ifdef COMPILED
+__device__ bool interact_call(Net* net, TM* tm, Port a, Port b);
+#else
+__device__ bool interact_call(Net* net, TM* tm, Port a, Port b) {
+  // Loads Definition.
+  u32 fid  = get_val(a) & 0xFFFFFFF;
+  Def* def = &BOOK.defs_buf[fid];
+
+  // Copy Optimization.
+  if (def->safe && get_tag(b) == DUP) {
+    return interact_eras(net, tm, a, b);
+  }
+
+  // Allocates needed nodes and vars.
+  if (!get_resources(net, tm, def->rbag_len + 1, def->node_len, def->vars_len)) {
+    return false;
+  }
+
+  // Stores new vars.
+  for (u32 i = 0; i < def->vars_len; ++i) {
+    vars_create(net, tm->vloc[i], NONE);
+  }
+
+  // Stores new nodes.
+  for (u32 i = 0; i < def->node_len; ++i) {
+    node_create(net, tm->nloc[i], adjust_pair(net, tm, def->node_buf[i]));
+  }
+
+  // Links.
+  for (u32 i = 0; i < def->rbag_len; ++i) {
+    link_pair(net, tm, adjust_pair(net, tm, def->rbag_buf[i]));
+  }
+  link_pair(net, tm, new_pair(adjust_port(net, tm, def->root), b));
+
+  return true;
+}
+#endif
+
+// The Anni Interaction.
+__device__ bool interact_anni(Net* net, TM* tm, Port a, Port b) {
+  // Allocates needed nodes and vars.
+  if (!get_resources(net, tm, 2, 0, 0)) {
+    return false;
+  }
+
+  // Loads ports.
+  Pair A  = node_take(net, get_val(a));
+  Port A1 = get_fst(A);
+  Port A2 = get_snd(A);
+  Pair B  = node_take(net, get_val(b));
+  Port B1 = get_fst(B);
+  Port B2 = get_snd(B);
+
+  // Links.
+  link_pair(net, tm, new_pair(A1, B1));
+  link_pair(net, tm, new_pair(A2, B2));
+
+  return true;
+}
+
+// The Comm Interaction.
+__device__ bool interact_comm(Net* net, TM* tm, Port a, Port b) {
+  // Allocates needed nodes and vars.
+  if (!get_resources(net, tm, 4, 4, 4)) {
+    return false;
+  }
+
+  // Loads ports.
+  Pair A  = node_take(net, get_val(a));
+  Port A1 = get_fst(A);
+  Port A2 = get_snd(A);
+  Pair B  = node_take(net, get_val(b));
+  Port B1 = get_fst(B);
+  Port B2 = get_snd(B);
+
+  // Stores new vars.
+  vars_create(net, tm->vloc[0], NONE);
+  vars_create(net, tm->vloc[1], NONE);
+  vars_create(net, tm->vloc[2], NONE);
+  vars_create(net, tm->vloc[3], NONE);
+
+  // Stores new nodes.
+  node_create(net, tm->nloc[0], new_pair(new_port(VAR, tm->vloc[0]), new_port(VAR, tm->vloc[1])));
+  node_create(net, tm->nloc[1], new_pair(new_port(VAR, tm->vloc[2]), new_port(VAR, tm->vloc[3])));
+  node_create(net, tm->nloc[2], new_pair(new_port(VAR, tm->vloc[0]), new_port(VAR, tm->vloc[2])));
+  node_create(net, tm->nloc[3], new_pair(new_port(VAR, tm->vloc[1]), new_port(VAR, tm->vloc[3])));
+
+  // Links.
+  link_pair(net, tm, new_pair(new_port(get_tag(b), tm->nloc[0]), A1));
+  link_pair(net, tm, new_pair(new_port(get_tag(b), tm->nloc[1]), A2));
+  link_pair(net, tm, new_pair(new_port(get_tag(a), tm->nloc[2]), B1));
+  link_pair(net, tm, new_pair(new_port(get_tag(a), tm->nloc[3]), B2));
+
+  return true;
+}
+
+// The Oper Interaction.
+__device__ bool interact_oper(Net* net, TM* tm, Port a, Port b) {
+  // Allocates needed nodes and vars.
+  if (!get_resources(net, tm, 1, 1, 0)) {
+    return false;
+  }
+
+  // Loads ports.
+  Val  av = get_val(a);
+  Pair B  = node_take(net, get_val(b));
+  Port B1 = get_fst(B);
+  Port B2 = enter(net, get_snd(B));
+
+  // Performs operation.
+  if (get_tag(B1) == NUM) {
+    Val  bv = get_val(B1);
+    Numb cv = operate(av, bv);
+    link_pair(net, tm, new_pair(new_port(NUM, cv), B2));
+  } else {
+    node_create(net, tm->nloc[0], new_pair(a, B2));
+    link_pair(net, tm, new_pair(B1, new_port(OPR, tm->nloc[0])));
+  }
+
+  return true;
+}
+
+// The Swit Interaction.
+__device__ bool interact_swit(Net* net, TM* tm, Port a, Port b) {
+  // Allocates needed nodes and vars.
+  if (!get_resources(net, tm, 1, 2, 0)) {
+    return false;
+  }
+
+  // Loads ports.
+  u32  av = get_u24(get_val(a));
+  Pair B  = node_take(net, get_val(b));
+  Port B1 = get_fst(B);
+  Port B2 = get_snd(B);
+
+  // Stores new nodes.
+  if (av == 0) {
+    node_create(net, tm->nloc[0], new_pair(B2, new_port(ERA,0)));
+    link_pair(net, tm, new_pair(new_port(CON, tm->nloc[0]), B1));
+  } else {
+    node_create(net, tm->nloc[0], new_pair(new_port(ERA,0), new_port(CON, tm->nloc[1])));
+    node_create(net, tm->nloc[1], new_pair(new_port(NUM, new_u24(av-1)), B2));
+    link_pair(net, tm, new_pair(new_port(CON, tm->nloc[0]), B1));
+  }
+
+  return true;
+}
+
+// Pops a local redex and performs a single interaction.
+__device__ bool interact(Net* net, TM* tm, Pair redex, u32 turn) {
+  // Gets redex ports A and B.
+  Port a = get_fst(redex);
+  Port b = get_snd(redex);
+
+  // Gets the rule type.
+  Rule rule = get_rule(a, b);
+
+  // If there is no redex, stop.
+  if (redex != 0) {
+    //if (GID() == 0 && turn == 0x201) {
+      //Pair kn = get_tag(b) == CON ? node_load(net, get_val(b)) : 0;
+      //printf("%04x:[%04x] REDUCE %s ~ %s | par? %d | (%s %s)\n",
+        //turn, GID(),
+        //show_port(get_fst(redex)).x,
+        //show_port(get_snd(redex)).x,
+        //get_par_flag(redex),
+        //show_port(get_fst(kn)).x,
+        //show_port(get_snd(kn)).x);
+    //}
+
+    // Used for root redex.
+    if (get_tag(a) == REF && b == ROOT) {
+      rule = CALL;
+    // Swaps ports if necessary.
+    } else if (should_swap(a,b)) {
+      swap(&a, &b);
+    }
+
+    // Dispatches interaction rule.
+    bool success;
+    switch (rule) {
+      case LINK: success = interact_link(net, tm, a, b); break;
+      case CALL: success = interact_call(net, tm, a, b); break;
+      case VOID: success = interact_void(net, tm, a, b); break;
+      case ERAS: success = interact_eras(net, tm, a, b); break;
+      case ANNI: success = interact_anni(net, tm, a, b); break;
+      case COMM: success = interact_comm(net, tm, a, b); break;
+      case OPER: success = interact_oper(net, tm, a, b); break;
+      case SWIT: success = interact_swit(net, tm, a, b); break;
+    }
+
+    // If error, pushes redex back.
+    if (!success) {
+      push_redex(tm, redex);
+      return false;
+    // Else, increments the interaction count.
+    } else if (rule != LINK) {
+      tm->itrs += 1;
+    }
+  }
+
+  return true;
+}
+
+#endif // evaluator_interactions_cuh_INCLUDED
diff --git a/src/cuda/hvm.cu b/src/cuda/hvm.cu
deleted file mode 100644
index 2699276c..00000000
--- a/src/cuda/hvm.cu
+++ /dev/null
@@ -1,828 +0,0 @@
-#define INTERPRETED
-#define WITH_MAIN
-
-#include "alloc.cuh"
-#include "structs/tm.cuh"
-#include "structs/book.cuh"
-#include "structs/gnet.cuh"
-#include "structs/rbag.cuh"
-#include "numb.cuh"
-#include "show.cuh"
-#include "sync.cuh"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-// Linking
-// -------
-
-// Atomically Links `A ~ B`.
-__device__ void link(Net* net, TM* tm, Port A, Port B) {
-  #ifdef DEBUG
-  Port INI_A = A;
-  Port INI_B = B;
-  #endif
-
-  u32 lps = 0;
-
-  // Attempts to directionally point `A ~> B`
-  while (true) {
-
-    // If `A` is NODE: swap `A` and `B`, and continue
-    if (get_tag(A) != VAR && get_tag(B) == VAR) {
-      Port X = A; A = B; B = X;
-    }
-
-    // If `A` is NODE: create the `A ~ B` redex
-    if (get_tag(A) != VAR) {
-      //printf("[%04x] new redex A %s ~ %s\n", GID(), show_port(A).x, show_port(B).x);
-      push_redex(tm, new_pair(A, B)); // TODO: move global ports to local
-      break;
-    }
-
-    // While `B` is VAR: extend it (as an optimization)
-    B = enter(net, B);
-
-    // Since `A` is VAR: point `A ~> B`.
-    if (true) {
-      // If B would leak...
-      if (is_global(A) && is_local(B)) {
-        // If B is a var, just swap it
-        if (is_var(B)) {
-          Port X = A; A = B; B = X;
-          continue;
-        }
-        // If B is a nod, create a leak interaction
-        if (is_nod(B)) {
-          //if (!TID()) printf("[%04x] NODE LEAK %s ~ %s\n", GID(), show_port(A).x, show_port(B).x);
-          push_redex(tm, new_pair(A, B));
-          break;
-        }
-      }
-
-      // Sanity check: if global A is unfilled, delay this link
-      if (is_global(A) && vars_load(net, get_val(A)) == 0) {
-        push_redex(tm, new_pair(A, B));
-        break;
-      }
-
-      // Stores `A -> B`, taking the current `A` subst as `A'`
-      Port A_ = vars_exchange(net, get_val(A), B);
-
-      // If there was no `A'`, stop, as we lost B's ownership
-      if (A_ == NONE) {
-        break;
-      }
-
-      #ifdef DEBUG
-      if (A_ == 0) printf("[%04x] ERR LINK %s ~ %s | %s ~ %s\n", GID(), show_port(INI_A).x, show_port(INI_B).x, show_port(A).x, show_port(B).x);
-      #endif
-
-      // Otherwise, delete `A` (we own both) and link `A' ~ B`
-      vars_take(net, get_val(A));
-      A = A_;
-    }
-  }
-}
-
-// Links `A ~ B` (as a pair).
-__device__ void link_pair(Net* net, TM* tm, Pair AB) {
-  link(net, tm, get_fst(AB), get_snd(AB));
-}
-
-// Interactions
-// ------------
-
-// The Link Interaction.
-__device__ bool interact_link(Net* net, TM* tm, Port a, Port b) {
-  // If A is a global var and B is a local node, leak it:
-  // ^A ~ (b1 b2)
-  // ------------- LEAK-NODE
-  // ^X ~ b1
-  // ^Y ~ b2
-  // ^A ~ ^(^X ^Y)
-  if (is_global(a) && is_nod(b) && is_local(b)) {
-    // Allocates needed nodes and vars.
-    if (!get_resources(net, tm, 3, 0, 0)) {
-      return false;
-    }
-
-    tm->leak += 1;
-
-    // Loads ports.
-    Pair l_b  = node_take(net, get_val(b));
-    Port l_b1 = enter(net, get_fst(l_b));
-    Port l_b2 = enter(net, get_snd(l_b));
-
-    // Leaks port 1.
-    Port g_b1;
-    if (is_local(l_b1)) {
-      g_b1 = new_port(VAR, g_vars_alloc_1(net));
-      vars_create(net, get_val(g_b1), NONE);
-      link_pair(net, tm, new_pair(g_b1, l_b1));
-    } else {
-      g_b1 = l_b1;
-    }
-
-    // Leaks port 2.
-    Port g_b2;
-    if (is_local(l_b2)) {
-      g_b2 = new_port(VAR, g_vars_alloc_1(net));
-      vars_create(net, get_val(g_b2), NONE);
-      link_pair(net, tm, new_pair(g_b2, l_b2));
-    } else {
-      g_b2 = l_b2;
-    }
-
-    // Leaks node.
-    Port g_b = new_port(get_tag(b), g_node_alloc_1(net));
-    node_create(net, get_val(g_b), new_pair(g_b1, g_b2));
-    link_pair(net, tm, new_pair(a, g_b));
-
-    return true;
-
-  // Otherwise, just perform a normal link.
-  } else {
-    // Allocates needed nodes and vars.
-    if (!get_resources(net, tm, 1, 0, 0)) {
-      return false;
-    }
-
-    link_pair(net, tm, new_pair(a, b));
-  }
-
-  return true;
-}
-
-// Declared here for use in call interactions.
-static inline bool interact_eras(Net* net, TM* tm, Port a, Port b);
-
-// The Call Interaction.
-#ifdef COMPILED
-///COMPILED_INTERACT_CALL///
-#else
-__device__ bool interact_eras(Net* net, TM* tm, Port a, Port b);
-__device__ bool interact_call(Net* net, TM* tm, Port a, Port b) {
-  // Loads Definition.
-  u32 fid  = get_val(a) & 0xFFFFFFF;
-  Def* def = &BOOK.defs_buf[fid];
-
-  // Copy Optimization.
-  if (def->safe && get_tag(b) == DUP) {
-    return interact_eras(net, tm, a, b);
-  }
-
-  // Allocates needed nodes and vars.
-  if (!get_resources(net, tm, def->rbag_len + 1, def->node_len, def->vars_len)) {
-    return false;
-  }
-
-  // Stores new vars.
-  for (u32 i = 0; i < def->vars_len; ++i) {
-    vars_create(net, tm->vloc[i], NONE);
-  }
-
-  // Stores new nodes.
-  for (u32 i = 0; i < def->node_len; ++i) {
-    node_create(net, tm->nloc[i], adjust_pair(net, tm, def->node_buf[i]));
-  }
-
-  // Links.
-  for (u32 i = 0; i < def->rbag_len; ++i) {
-    link_pair(net, tm, adjust_pair(net, tm, def->rbag_buf[i]));
-  }
-  link_pair(net, tm, new_pair(adjust_port(net, tm, def->root), b));
-
-  return true;
-}
-#endif
-
-// The Void Interaction.
-__device__ bool interact_void(Net* net, TM* tm, Port a, Port b) {
-  return true;
-}
-
-// The Eras Interaction.
-__device__ bool interact_eras(Net* net, TM* tm, Port a, Port b) {
-  // Allocates needed nodes and vars.
-  if (!get_resources(net, tm, 2, 0, 0)) {
-    return false;
-  }
-
-  // Loads ports.
-  Pair B  = node_take(net, get_val(b));
-  Port B1 = get_fst(B);
-  Port B2 = get_snd(B);
-
-  // Links.
-  link_pair(net, tm, new_pair(a, B1));
-  link_pair(net, tm, new_pair(a, B2));
-
-  return true;
-}
-
-// The Anni Interaction.
-__device__ bool interact_anni(Net* net, TM* tm, Port a, Port b) {
-  // Allocates needed nodes and vars.
-  if (!get_resources(net, tm, 2, 0, 0)) {
-    return false;
-  }
-
-  // Loads ports.
-  Pair A  = node_take(net, get_val(a));
-  Port A1 = get_fst(A);
-  Port A2 = get_snd(A);
-  Pair B  = node_take(net, get_val(b));
-  Port B1 = get_fst(B);
-  Port B2 = get_snd(B);
-
-  // Links.
-  link_pair(net, tm, new_pair(A1, B1));
-  link_pair(net, tm, new_pair(A2, B2));
-
-  return true;
-}
-
-// The Comm Interaction.
-__device__ bool interact_comm(Net* net, TM* tm, Port a, Port b) {
-  // Allocates needed nodes and vars.
-  if (!get_resources(net, tm, 4, 4, 4)) {
-    return false;
-  }
-
-  // Loads ports.
-  Pair A  = node_take(net, get_val(a));
-  Port A1 = get_fst(A);
-  Port A2 = get_snd(A);
-  Pair B  = node_take(net, get_val(b));
-  Port B1 = get_fst(B);
-  Port B2 = get_snd(B);
-
-  // Stores new vars.
-  vars_create(net, tm->vloc[0], NONE);
-  vars_create(net, tm->vloc[1], NONE);
-  vars_create(net, tm->vloc[2], NONE);
-  vars_create(net, tm->vloc[3], NONE);
-
-  // Stores new nodes.
-  node_create(net, tm->nloc[0], new_pair(new_port(VAR, tm->vloc[0]), new_port(VAR, tm->vloc[1])));
-  node_create(net, tm->nloc[1], new_pair(new_port(VAR, tm->vloc[2]), new_port(VAR, tm->vloc[3])));
-  node_create(net, tm->nloc[2], new_pair(new_port(VAR, tm->vloc[0]), new_port(VAR, tm->vloc[2])));
-  node_create(net, tm->nloc[3], new_pair(new_port(VAR, tm->vloc[1]), new_port(VAR, tm->vloc[3])));
-
-  // Links.
-  link_pair(net, tm, new_pair(new_port(get_tag(b), tm->nloc[0]), A1));
-  link_pair(net, tm, new_pair(new_port(get_tag(b), tm->nloc[1]), A2));
-  link_pair(net, tm, new_pair(new_port(get_tag(a), tm->nloc[2]), B1));
-  link_pair(net, tm, new_pair(new_port(get_tag(a), tm->nloc[3]), B2));
-
-  return true;
-}
-
-// The Oper Interaction.
-__device__ bool interact_oper(Net* net, TM* tm, Port a, Port b) {
-  // Allocates needed nodes and vars.
-  if (!get_resources(net, tm, 1, 1, 0)) {
-    return false;
-  }
-
-  // Loads ports.
-  Val  av = get_val(a);
-  Pair B  = node_take(net, get_val(b));
-  Port B1 = get_fst(B);
-  Port B2 = enter(net, get_snd(B));
-
-  // Performs operation.
-  if (get_tag(B1) == NUM) {
-    Val  bv = get_val(B1);
-    Numb cv = operate(av, bv);
-    link_pair(net, tm, new_pair(new_port(NUM, cv), B2));
-  } else {
-    node_create(net, tm->nloc[0], new_pair(a, B2));
-    link_pair(net, tm, new_pair(B1, new_port(OPR, tm->nloc[0])));
-  }
-
-  return true;
-}
-
-// The Swit Interaction.
-__device__ bool interact_swit(Net* net, TM* tm, Port a, Port b) {
-  // Allocates needed nodes and vars.
-  if (!get_resources(net, tm, 1, 2, 0)) {
-    return false;
-  }
-
-  // Loads ports.
-  u32  av = get_u24(get_val(a));
-  Pair B  = node_take(net, get_val(b));
-  Port B1 = get_fst(B);
-  Port B2 = get_snd(B);
-
-  // Stores new nodes.
-  if (av == 0) {
-    node_create(net, tm->nloc[0], new_pair(B2, new_port(ERA,0)));
-    link_pair(net, tm, new_pair(new_port(CON, tm->nloc[0]), B1));
-  } else {
-    node_create(net, tm->nloc[0], new_pair(new_port(ERA,0), new_port(CON, tm->nloc[1])));
-    node_create(net, tm->nloc[1], new_pair(new_port(NUM, new_u24(av-1)), B2));
-    link_pair(net, tm, new_pair(new_port(CON, tm->nloc[0]), B1));
-  }
-
-  return true;
-}
-
-// Pops a local redex and performs a single interaction.
-__device__ bool interact(Net* net, TM* tm, Pair redex, u32 turn) {
-  // Gets redex ports A and B.
-  Port a = get_fst(redex);
-  Port b = get_snd(redex);
-
-  // Gets the rule type.
-  Rule rule = get_rule(a, b);
-
-  // If there is no redex, stop.
-  if (redex != 0) {
-    //if (GID() == 0 && turn == 0x201) {
-      //Pair kn = get_tag(b) == CON ? node_load(net, get_val(b)) : 0;
-      //printf("%04x:[%04x] REDUCE %s ~ %s | par? %d | (%s %s)\n",
-        //turn, GID(),
-        //show_port(get_fst(redex)).x,
-        //show_port(get_snd(redex)).x,
-        //get_par_flag(redex),
-        //show_port(get_fst(kn)).x,
-        //show_port(get_snd(kn)).x);
-    //}
-
-    // Used for root redex.
-    if (get_tag(a) == REF && b == ROOT) {
-      rule = CALL;
-    // Swaps ports if necessary.
-    } else if (should_swap(a,b)) {
-      swap(&a, &b);
-    }
-
-    // Dispatches interaction rule.
-    bool success;
-    switch (rule) {
-      case LINK: success = interact_link(net, tm, a, b); break;
-      case CALL: success = interact_call(net, tm, a, b); break;
-      case VOID: success = interact_void(net, tm, a, b); break;
-      case ERAS: success = interact_eras(net, tm, a, b); break;
-      case ANNI: success = interact_anni(net, tm, a, b); break;
-      case COMM: success = interact_comm(net, tm, a, b); break;
-      case OPER: success = interact_oper(net, tm, a, b); break;
-      case SWIT: success = interact_swit(net, tm, a, b); break;
-    }
-
-    // If error, pushes redex back.
-    if (!success) {
-      push_redex(tm, redex);
-      return false;
-    // Else, increments the interaction count.
-    } else if (rule != LINK) {
-      tm->itrs += 1;
-    }
-  }
-
-  return true;
-}
-
-// RBag Save/Load
-// --------------
-
-// Transposes an index over a matrix.
-__device__ u32 transpose(u32 idx, u32 width, u32 height) {
-  u32 old_row = idx / width;
-  u32 old_col = idx % width;
-  u32 new_row = old_col % height;
-  u32 new_col = old_col / height + old_row * (width / height);
-  return new_row * width + new_col;
-}
-
-
-// Moves redexes from shared memory to global bag
-__device__ void save_redexes(Net* net, TM *tm, u32 turn) {
-  u32 idx = 0;
-  u32 bag = tm->mode == SEED ? transpose(GID(), TPB, BPG) : GID();
-
-  // Leaks low-priority redexes
-  for (u32 i = 0; i < tm->rbag.lo_end; ++i) {
-    Pair R = tm->rbag.lo_buf[i % RLEN];
-    Port x = get_fst(R);
-    Port y = get_snd(R);
-    Port X = new_port(VAR, g_vars_alloc_1(net));
-    Port Y = new_port(VAR, g_vars_alloc_1(net));
-    vars_create(net, get_val(X), NONE);
-    vars_create(net, get_val(Y), NONE);
-    link_pair(net, tm, new_pair(X, x));
-    link_pair(net, tm, new_pair(Y, y));
-    net->g_rbag_buf_B[bag * RLEN + (idx++)] = new_pair(X, Y);
-  }
-  __syncthreads();
-  tm->rbag.lo_end = 0;
-
-  // Executes all high-priority redexes
-  while (rbag_has_highs(&tm->rbag)) {
-    Pair redex = pop_redex(tm);
-    if (!interact(net, tm, redex, turn)) {
-      printf("ERROR: failed to clear high-priority redexes");
-    }
-  }
-  __syncthreads();
-
-  #ifdef DEBUG
-  if (rbag_len(&tm->rbag) > 0) printf("[%04x] ERR SAVE_REDEXES lo=%d hi=%d tot=%d\n", GID(), tm->rbag.lo_end, tm->rbag.hi_end, rbag_len(&tm->rbag));
-  #endif
-
-  // Updates global redex counter
-  atomicAdd(net->g_rbag_use_B, idx);
-}
-
-// Loads redexes from global bag to shared memory
-// FIXME: check if we have enuogh space for all loads
-__device__ void load_redexes(Net* net, TM *tm, u32 turn) {
-  u32 gid = BID() * TPB + TID();
-  u32 bag = tm->mode == SEED ? transpose(GID(), TPB, BPG) : GID();
-  for (u32 i = 0; i < RLEN; ++i) {
-    Pair redex = atomicExch(&net->g_rbag_buf_A[bag * RLEN + i], 0);
-    if (redex != 0) {
-      Port a = enter(net, get_fst(redex));
-      Port b = enter(net, get_snd(redex));
-      #ifdef DEBUG
-      if (is_local(a) || is_local(b)) printf("[%04x] ERR LOAD_REDEXES\n", turn);
-      #endif
-      push_redex(tm, new_pair(a, b));
-    } else {
-      break;
-    }
-  }
-  __syncthreads();
-}
-
-// Kernels
-// -------
-
-// EVAL
-__global__ void evaluator(GNet* gnet) {
-  extern __shared__ char shared_mem[]; // 96 KB
-  __shared__ Pair spawn[TPB]; // thread initialized
-
-  // Thread Memory
-  TM tm = tmem_new();
-
-  // Net (Local-Global View)
-  Net net = vnet_new(gnet, shared_mem, gnet->turn);
-
-  // Clears shared memory
-  for (u32 i = 0; i < L_NODE_LEN / TPB; ++i) {
-    net.l_node_buf[i * TPB + TID()] = 0;
-    net.l_vars_buf[i * TPB + TID()] = 0;
-  }
-  __syncthreads();
-
-  // Sets mode
-  tm.mode = gnet->mode;
-
-  // Loads Redexes
-  load_redexes(&net, &tm, gnet->turn);
-
-  // Clears spawn buffer
-  spawn[TID()] = rbag_len(&tm.rbag) > 0 ? 0xFFFFFFFFFFFFFFFF : 0;
-  __syncthreads();
-
-  // Variables
-  u64 INIT = clock64(); // initial time
-  u32 HASR = block_count(rbag_len(&tm.rbag) > 0);
-  u32 tick = 0;
-  u32 bag  = tm.mode == SEED ? transpose(GID(), TPB, BPG) : GID();
-  u32 rpos = gnet->rbag_pos[bag] > 0 ? gnet->rbag_pos[bag] - gnet->rdec : gnet->rbag_pos[bag];
-  u8  down = gnet->down;
-
-  //if (BID() == 0 && gnet->turn == 0x69) {
-    //printf("[%04x] ini rpos is %d | bag=%d\n", GID(), rpos, bag);
-  //}
-
-  // Aborts if empty
-  if (HASR == 0) {
-    return;
-  }
-
-  //if (BID() == 0 && rbag_len(&tm.rbag) > 0) {
-    //Pair redex = pop_redex(&tm);
-    //Pair kn = get_tag(get_snd(redex)) == CON ? node_load(&net, get_val(get_snd(redex))) : 0;
-    //printf("[%04x] HAS REDEX %s ~ %s | par? %d | (%s %s)\n",
-      //GID(),
-      //show_port(get_fst(redex)).x,
-      //show_port(get_snd(redex)).x,
-      //get_par_flag(redex),
-      //show_port(get_fst(kn)).x,
-      //show_port(get_snd(kn)).x);
-    //push_redex(&tm, redex);
-  //}
-
-  //// Display debug rbag
-  //if (GID() == 0) {
-    //print_rbag(&net, &tm);
-    //printf("| rbag_pos = %d | mode = %d | down = %d | turn = %04x\n", gnet->rbag_pos[bag], gnet->mode, down, gnet->turn);
-  //}
-  //__syncthreads();
-
-  // GROW MODE
-  // ---------
-
-  if (tm.mode == SEED || tm.mode == GROW) {
-    u32 tlim = tm.mode == SEED ? min(TPB_L2,BPG_L2) : max(TPB_L2,BPG_L2);
-    u32 span = 1 << (32 - __clz(TID()));
-
-    Pair redex;
-
-    for (u32 tick = 0; tick < tlim; ++tick) {
-      u32 span = 1 << tick;
-      u32 targ = TID() ^ span;
-
-      // Attempts to spawn a thread
-      if (TID() < span && spawn[targ] == 0) {
-        //if (BID() == 0) {
-          //if (!TID()) printf("----------------------------------------------------\n");
-          //if (!TID()) printf("TIC %04x | span=%d | rlen=%d | ", tick, span, rbag_len(&tm.rbag));
-          //block_print(rbag_len(&tm.rbag));
-          //if (!TID()) printf("\n");
-          //__syncthreads();
-        //}
-
-        // Performs some interactions until a parallel redex is found
-        for (u32 i = 0; i < 64; ++i) {
-          if (tm.rbag.lo_end < rpos) break;
-          redex = pop_redex(&tm);
-          if (redex == 0) {
-            break;
-          }
-          // If we found a stealable redex, pass it to stealing,
-          // and un-mark the redex above it, so we keep it for us.
-          if (get_par_flag(redex)) {
-            Pair above = pop_redex(&tm);
-            if (above != 0) {
-              push_redex(&tm, clr_par_flag(above));
-            }
-            break;
-          }
-          interact(&net, &tm, redex, gnet->turn);
-          redex = 0;
-          while (tm.rbag.hi_end > 0) {
-            if (!interact(&net, &tm, pop_redex(&tm), gnet->turn)) break;
-          }
-        }
-
-        // Spawn a thread
-        if (redex != 0 && get_par_flag(redex)) {
-          //if (BID() == 0) {
-            //Pair kn = get_tag(get_snd(redex)) == CON ? node_load(&net, get_val(get_snd(redex))) : 0;
-            //printf("[%04x] GIVE %s ~ %s | par? %d | (%s %s) | rbag.lo_end=%d\n", GID(), show_port(get_fst(redex)).x, show_port(get_snd(redex)).x, get_par_flag(redex), show_port(peek(&net, &tm, get_fst(kn))).x, show_port(peek(&net, &tm, get_snd(kn))).x, tm.rbag.lo_end);
-          //}
-
-          spawn[targ] = clr_par_flag(redex);
-          if (!down) {
-            rpos = tm.rbag.lo_end - 1;
-          }
-        }
-      }
-      __syncthreads();
-
-      // If we've been spawned, push initial redex
-      if (TID() >= span && TID() < span*2 && spawn[TID()] != 0 && spawn[TID()] != 0xFFFFFFFFFFFFFFFF) {
-        //if (rbag_len(&tm.rbag) > 0) {
-          //printf("[%04x] ERROR: SPAWNED BUT HAVE REDEX\n", GID());
-        //}
-
-        push_redex(&tm, atomicExch(&spawn[TID()], 0xFFFFFFFFFFFFFFFF));
-        rpos = 0;
-        //if (BID() == 0) printf("[%04x] TAKE %016llx\n", GID(), spawn[TID()]);
-      }
-      __syncthreads();
-
-      //if (BID() == 0) {
-        //if (!TID()) printf("TAC %04x | span=%d | rlen=%d | ", tick, span, rbag_len(&tm.rbag));
-        //block_print(rbag_len(&tm.rbag));
-        //if (!TID()) printf("\n");
-        //__syncthreads();
-      //}
-      //__syncthreads();
-
-      //printf("[%04x] span is %d\n", TID(), span);
-      //__syncthreads();
-    }
-
-    //if (BID() == 0 && gnet->turn == 0x69) {
-      //printf("[%04x] end rpos is %d | bag=%d\n", GID(), rpos, bag);
-    //}
-
-    gnet->rbag_pos[bag] = rpos;
-
-  }
-
-  // WORK MODE
-  // ---------
-
-  if (tm.mode == WORK) {
-    u32 chkt = 0;
-    u32 chka = 1;
-    u32 bag  = tm.mode == SEED ? transpose(GID(), TPB, BPG) : GID();
-    u32 rpos = gnet->rbag_pos[bag];
-    for (tick = 0; tick < 1 << 9; ++tick) {
-      if (tm.rbag.lo_end > rpos || rbag_has_highs(&tm.rbag)) {
-        if (interact(&net, &tm, pop_redex(&tm), gnet->turn)) {
-          while (rbag_has_highs(&tm.rbag)) {
-            if (!interact(&net, &tm, pop_redex(&tm), gnet->turn)) break;
-          }
-        }
-      }
-      __syncthreads();
-    }
-  }
-  __syncthreads();
-
-  //u32 ITRS = block_sum(tm.itrs);
-  //u32 LOOP = block_sum((u32)tick);
-  //u32 RLEN = block_sum(rbag_len(&tm.rbag));
-  //u32 FAIL = 0; // block_sum((u32)fail);
-  //f64 TIME = (f64)(clock64() - INIT) / (f64)S;
-  //f64 MIPS = (f64)ITRS / TIME / (f64)1000000.0;
-  ////if (BID() >= 0 && TID() == 0) {
-  //if (TID() == 0) {
-    //printf("%04x:[%02x]: MODE=%d DOWN=%d ITRS=%d LOOP=%d RLEN=%d FAIL=%d TIME=%f MIPS=%.0f | %d\n",
-      //gnet->turn, BID(), tm.mode, down, ITRS, LOOP, RLEN, FAIL, TIME, MIPS, 42);
-  //}
-  //__syncthreads();
-
-  // Display debug rbag
-  //if (BID() == 0) {
-    //for (u32 i = 0; i < TPB; ++i) {
-      //if (TID() == i && rbag_len(&tm.rbag) > 0) print_rbag(&net, &tm);
-      //__syncthreads();
-    //}
-    //__syncthreads();
-  //}
-
-  // Moves rbag to global
-  save_redexes(&net, &tm, gnet->turn);
-
-  // Stores rewrites
-  atomicAdd(&gnet->iadd, tm.itrs);
-  atomicAdd(&gnet->leak, tm.leak);
-
-}
-
-// GNet Host Functions
-// -------------------
-
-void gnet_normalize(GNet* gnet) {
-  // Invokes the Evaluator Kernel repeatedly
-  u32 turn;
-  u64 itrs = 0;
-  u32 rlen = 0;
-  // NORM
-  for (turn = 0; turn < 0xFFFFFFFF; ++turn) {
-    //printf("\e[1;1H\e[2J");
-    //printf("==================================================== ");
-    //printf("TURN: %04x | RLEN: %04x | ITRS: %012llu\n", turn, rlen, itrs);
-    //cudaDeviceSynchronize();
-
-    evaluator<<<BPG, TPB, sizeof(LNet)>>>(gnet);
-    gnet_inbetween<<<1, 1>>>(gnet);
-    //cudaDeviceSynchronize();
-
-    //count_memory<<<BPG, TPB>>>(gnet);
-    //cudaDeviceSynchronize();
-
-    //print_heatmap<<<1,1>>>(gnet, turn+1);
-    //cudaDeviceSynchronize();
-
-    itrs = gnet_get_itrs(gnet);
-    rlen = gnet_get_rlen(gnet, turn);
-    if (rlen == 0) {
-      //printf("Completed after %d kernel launches!\n", turn);
-      break;
-    }
-  }
-}
-
-// Expands a REF Port.
-Port gnet_expand(GNet* gnet, Port port) {
-  Port old = gnet_vars_load(gnet, get_val(ROOT));
-  Port got = gnet_peek(gnet, port);
-  //printf("expand %s\n", show_port(got).x);
-  while (get_tag(got) == REF) {
-    gnet_boot_redex(gnet, new_pair(got, ROOT));
-    gnet_normalize(gnet);
-    got = gnet_peek(gnet, gnet_vars_load(gnet, get_val(ROOT)));
-  }
-  gnet_vars_create(gnet, get_val(ROOT), old);
-  return got;
-}
-
-// Demos
-// -----
-
-  // stress_test 2^10 x 65536
-  //static const u8 BOOK_BUF[] = {6, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 4, 0, 0, 0, 11, 10, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 102, 117, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 0, 9, 0, 0, 128, 20, 0, 0, 0, 9, 0, 0, 128, 44, 0, 0, 0, 13, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 30, 0, 0, 0, 3, 4, 0, 0, 38, 0, 0, 0, 24, 0, 0, 0, 16, 0, 0, 0, 8, 0, 0, 0, 24, 0, 0, 0, 4, 0, 0, 0, 108, 111, 111, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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-
-  // stress_test 2^18 x 65536
-  //static const u8 BOOK_BUF[] = {6, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 102, 117, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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-
-  // bitonic_sort 2^20
-  static const u8 BOOK_BUF[] = {19, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 89, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 12, 0, 0, 0, 65, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 100, 111, 119, 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-
-//COMPILED_BOOK_BUF//
-
-// Main
-// ----
-
-#ifdef IO
-void do_run_io(GNet* gnet, Book* book, Port port);
-#endif
-
-extern "C" void hvm_cu(u32* book_buffer) {
-  // Loads the Book
-  Book* book = (Book*)malloc(sizeof(Book));
-  if (book_buffer) {
-    if (!book_load(book, (u32*)book_buffer)) {
-      fprintf(stderr, "failed to load book\n");
-
-      return;
-    }
-    cudaMemcpyToSymbol(BOOK, book, sizeof(Book));
-  }
-
-  // Configures Shared Memory Size
-  cudaFuncSetAttribute(evaluator, cudaFuncAttributeMaxDynamicSharedMemorySize, sizeof(LNet));
-
-  // Creates a new GNet
-  GNet* gnet = gnet_create();
-
-  // Start the timer
-  clock_t start = clock();
-
-  // Boots root redex, to expand @main
-  gnet_boot_redex(gnet, new_pair(new_port(REF, 0), ROOT));
-
-  #ifdef IO
-  do_run_io(gnet, book, ROOT);
-  #else
-  gnet_normalize(gnet);
-  #endif
-
-  cudaDeviceSynchronize();
-
-  // Stops the timer
-  clock_t end = clock();
-  double duration = ((double)(end - start)) / CLOCKS_PER_SEC;
-
-  // Prints the result
-  print_result<<<1,1>>>(gnet);
-
-  // Reports errors
-  cudaError_t err = cudaGetLastError();
-  if (err != cudaSuccess) {
-    fprintf(stderr, "Failed to launch kernels. Error code: %s.\n", cudaGetErrorString(err));
-    if (err == cudaErrorInvalidConfiguration) {
-      fprintf(stderr, "Note: for now, HVM-CUDA requires a GPU with at least 128 KB of L1 cache per SM.\n");
-    }
-    exit(EXIT_FAILURE);
-  }
-
-  // Prints entire memdump
-  //{
-    //// Allocate host memory for the net
-    //GNet *h_gnet = (GNet*)malloc(sizeof(GNet));
-
-    //// Copy the net from device to host
-    //cudaMemcpy(h_gnet, gnet, sizeof(GNet), cudaMemcpyDeviceToHost);
-
-    //// Create a Net view of the host GNet
-    //Net net;
-    //net.g_node_buf = h_gnet->node_buf;
-    //net.g_vars_buf = h_gnet->vars_buf;
-
-    //// Print the net
-    //print_net(&net, L_NODE_LEN, G_NODE_LEN);
-
-    //// Free host memory
-    //free(h_gnet);
-  //}
-
-  // Gets interaction count
-  //cudaMemcpy(&itrs, &gnet->itrs, sizeof(u64), cudaMemcpyDeviceToHost);
-
-  // Prints interactions, time and MIPS
-  printf("- ITRS: %llu\n", gnet_get_itrs(gnet));
-  printf("- LEAK: %llu\n", gnet_get_leak(gnet));
-  printf("- TIME: %.2fs\n", duration);
-  printf("- MIPS: %.2f\n", (double)gnet_get_itrs(gnet) / duration / 1000000.0);
-}
-
-#ifdef WITH_MAIN
-int main() {
-  hvm_cu((u32*)BOOK_BUF);
-  return 0;
-}
-#endif
diff --git a/src/cuda/hvm.cuh b/src/cuda/hvm.cuh
new file mode 100644
index 00000000..6f15bdcc
--- /dev/null
+++ b/src/cuda/hvm.cuh
@@ -0,0 +1,94 @@
+#ifndef hvm_cuh_INCLUDED
+#define hvm_cuh_INCLUDED
+
+#include "evaluator.cuh"
+#include "structs/book.cuh"
+#include "show.cuh"
+
+#include <stdio.h>
+
+//COMPILED_BOOK_BUF//
+///COMPILED_INTERACT_CALL///
+
+// Normalize the root net in book_buffer and print the result.
+extern "C" void hvm_cu(u32* book_buffer) {
+  // Loads the Book
+  Book* book = (Book*)malloc(sizeof(Book));
+  if (book_buffer) {
+    if (!book_load(book, (u32*)book_buffer)) {
+      fprintf(stderr, "failed to load book\n");
+
+      return;
+    }
+    cudaMemcpyToSymbol(BOOK, book, sizeof(Book));
+  }
+
+  // Configures Shared Memory Size
+  cudaFuncSetAttribute(evaluator, cudaFuncAttributeMaxDynamicSharedMemorySize, sizeof(LNet));
+
+  // Creates a new GNet
+  GNet* gnet = gnet_create();
+
+  // Start the timer
+  clock_t start = clock();
+
+  // Boots root redex, to expand @main
+  gnet_boot_redex(gnet, new_pair(new_port(REF, 0), ROOT));
+
+  #ifdef IO
+  void do_run_io(GNet* gnet, Book* book, Port port);
+  do_run_io(gnet, book, ROOT);
+  #else
+  gnet_normalize(gnet);
+  #endif
+
+  cudaDeviceSynchronize();
+
+  // Stops the timer
+  clock_t end = clock();
+  double duration = ((double)(end - start)) / CLOCKS_PER_SEC;
+
+  // Prints the result
+  print_result<<<1,1>>>(gnet);
+
+  // Reports errors
+  cudaError_t err = cudaGetLastError();
+  if (err != cudaSuccess) {
+    fprintf(stderr, "Failed to launch kernels. Error code: %s.\n", cudaGetErrorString(err));
+    if (err == cudaErrorInvalidConfiguration) {
+      fprintf(stderr, "Note: for now, HVM-CUDA requires a GPU with at least 128 KB of L1 cache per SM.\n");
+    }
+    exit(EXIT_FAILURE);
+  }
+
+  // Prints entire memdump
+  //{
+    //// Allocate host memory for the net
+    //GNet *h_gnet = (GNet*)malloc(sizeof(GNet));
+
+    //// Copy the net from device to host
+    //cudaMemcpy(h_gnet, gnet, sizeof(GNet), cudaMemcpyDeviceToHost);
+
+    //// Create a Net view of the host GNet
+    //Net net;
+    //net.g_node_buf = h_gnet->node_buf;
+    //net.g_vars_buf = h_gnet->vars_buf;
+
+    //// Print the net
+    //print_net(&net, L_NODE_LEN, G_NODE_LEN);
+
+    //// Free host memory
+    //free(h_gnet);
+  //}
+
+  // Gets interaction count
+  //cudaMemcpy(&itrs, &gnet->itrs, sizeof(u64), cudaMemcpyDeviceToHost);
+
+  // Prints interactions, time and MIPS
+  printf("- ITRS: %llu\n", gnet_get_itrs(gnet));
+  printf("- LEAK: %llu\n", gnet_get_leak(gnet));
+  printf("- TIME: %.2fs\n", duration);
+  printf("- MIPS: %.2f\n", (double)gnet_get_itrs(gnet) / duration / 1000000.0);
+}
+
+#endif // hvm_cuh_INCLUDED
diff --git a/src/cuda/main.cu b/src/cuda/main.cu
new file mode 100644
index 00000000..ada37cdc
--- /dev/null
+++ b/src/cuda/main.cu
@@ -0,0 +1,18 @@
+#include "hvm.cuh"
+
+// Demos
+// -----
+
+// stress_test 2^10 x 65536
+//static const u8 BOOK_BUF[] = {6, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 4, 0, 0, 0, 11, 10, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 102, 117, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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+
+// stress_test 2^18 x 65536
+//static const u8 BOOK_BUF[] = {6, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 102, 117, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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+
+// bitonic_sort 2^20
+// static const u8 BOOK_BUF[] = {19, 0, 0, 0, 0, 0, 0, 0, 109, 97, 105, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 89, 0, 0, 0, 4, 0, 0, 0, 11, 18, 0, 0, 12, 0, 0, 0, 65, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 100, 111, 119, 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+
+int main() {
+  hvm_cu((u32*)BOOK_BUF);
+  return 0;
+}

From 71ea5c89d2ed2ed6bc042c9da9f66eccaa0603d1 Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Mon, 26 Aug 2024 17:22:05 +0200
Subject: [PATCH 6/7] fix mixup with time64

---
 src/c/run.c     | 7 -------
 src/cuda/run.cu | 7 +++++++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/c/run.c b/src/c/run.c
index 2bfb7960..13b3fa94 100644
--- a/src/c/run.c
+++ b/src/c/run.c
@@ -596,13 +596,6 @@ Port io_seek(Net* net, Book* book, Port argm) {
   return inject_ok(net, new_port(ERA, 0));
 }
 
-// TODO: write a time64() function that returns the time as fast as possible as a u64
-__host__ __device__ inline u64 time64() {
-  struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
-  return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
-}
-
 // Returns the current time as a tuple of the high
 // and low 24 bits of a 48-bit nanosecond timestamp.
 // Returns: Result<(u24, u24), IOError<*>>
diff --git a/src/cuda/run.cu b/src/cuda/run.cu
index 970f8a01..140ca091 100644
--- a/src/cuda/run.cu
+++ b/src/cuda/run.cu
@@ -714,6 +714,13 @@ Port io_seek(GNet* gnet, Port argm) {
   return gnet_inject_ok(gnet, new_port(ERA, 0));
 }
 
+// TODO: write a time64() function that returns the time as fast as possible as a u64
+__host__ __device__ inline u64 time64() {
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (u64)ts.tv_sec * 1000000000ULL + (u64)ts.tv_nsec;
+}
+
 // Returns the current time as a tuple of the high
 // and low 24 bits of a 48-bit nanosecond timestamp.
 // Returns: Result<(u24, u24), IOError<*>>

From ca86f9a9e22c0c127d39659cb34bcdc2c47668e8 Mon Sep 17 00:00:00 2001
From: Enrico Zandomeni Borba <enricozb@gmail.com>
Date: Mon, 26 Aug 2024 17:55:00 +0200
Subject: [PATCH 7/7] working run-cu

---
 src/cuda/evaluator/interactions.cuh | 8 ++++----
 src/cuda/hvm.cuh                    | 5 ++++-
 src/cuda/run.cu                     | 4 ++--
 src/main.rs                         | 2 +-
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/cuda/evaluator/interactions.cuh b/src/cuda/evaluator/interactions.cuh
index 579ba412..8ede3f36 100644
--- a/src/cuda/evaluator/interactions.cuh
+++ b/src/cuda/evaluator/interactions.cuh
@@ -1,10 +1,10 @@
 #ifndef evaluator_interactions_cuh_INCLUDED
 #define evaluator_interactions_cuh_INCLUDED
 
-#include "alloc.cuh"
-#include "numb.cuh"
-#include "structs/rbag.cuh"
-#include "structs/gnet.cuh"
+#include "../alloc.cuh"
+#include "../numb.cuh"
+#include "../structs/rbag.cuh"
+#include "../structs/gnet.cuh"
 
 // Linking
 // -------
diff --git a/src/cuda/hvm.cuh b/src/cuda/hvm.cuh
index 6f15bdcc..8efa5201 100644
--- a/src/cuda/hvm.cuh
+++ b/src/cuda/hvm.cuh
@@ -10,6 +10,10 @@
 //COMPILED_BOOK_BUF//
 ///COMPILED_INTERACT_CALL///
 
+#ifdef IO
+void do_run_io(GNet* gnet, Book* book, Port port);
+#endif
+
 // Normalize the root net in book_buffer and print the result.
 extern "C" void hvm_cu(u32* book_buffer) {
   // Loads the Book
@@ -36,7 +40,6 @@ extern "C" void hvm_cu(u32* book_buffer) {
   gnet_boot_redex(gnet, new_pair(new_port(REF, 0), ROOT));
 
   #ifdef IO
-  void do_run_io(GNet* gnet, Book* book, Port port);
   do_run_io(gnet, book, ROOT);
   #else
   gnet_normalize(gnet);
diff --git a/src/cuda/run.cu b/src/cuda/run.cu
index 140ca091..d18a0c9f 100644
--- a/src/cuda/run.cu
+++ b/src/cuda/run.cu
@@ -1,7 +1,7 @@
+#include "hvm.cuh"
 #include <dlfcn.h>
 #include <errno.h>
 #include <stdio.h>
-#include "hvm.cu"
 
 // Readback: λ-Encoded Ctr
 struct Ctr {
@@ -823,7 +823,7 @@ Port io_dl_call(GNet* gnet, Port argm) {
 // Closes a loaded dylib, reclaiming the handle.
 //
 // Returns:  Result<*, IOError<String>>
-Port io_dl_close(GNet* gnet, Book* book, Port argm) {
+Port io_dl_close(GNet* gnet, Port argm) {
   void* dl = readback_dylib(argm);
   if (dl == NULL) {
     fprintf(stderr, "io_dl_close: invalid handle\n");
diff --git a/src/main.rs b/src/main.rs
index 6bf320db..70735997 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -145,7 +145,7 @@ fn main() {
       //let hvm_c = hvm_c.replace("#define INTERPRETED", "#define COMPILED");
       
       // Generates the Cuda file
-      let hvm_cu = include_str!("cuda/hvm.cu");
+      let hvm_cu = include_str!("cuda/main.cu");
       let hvm_cu = format!("#define IO\n\n{hvm_cu}");
       let hvm_cu = hvm_cu.replace("//COMPILED_BOOK_BUF//", &bookb);
       let hvm_cu = hvm_cu.replace("#define WITHOUT_MAIN", "#define WITH_MAIN");