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Remove vector of bools in vext #622

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Remove vector of bools in vext #622

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eec31ec
remove vector of bools in vext
Yui5427 Nov 24, 2024
1ae3558
remove vector of bools in vext
Yui5427 Nov 24, 2024
819e0ac
Use bit manipulation instead of flip_bits function
Yui5427 Nov 30, 2024
0c53144
Use ~ instead of if
Yui5427 Dec 3, 2024
1f8fef9
Update model/riscv_insts_vext_vm.sail
rez5427 Dec 4, 2024
1b7d22f
Update model/riscv_vext_regs.sail
rez5427 Dec 4, 2024
338477c
Update model/riscv_insts_vext_vm.sail
rez5427 Dec 4, 2024
c74d15d
Remove vm_bit
Yui5427 Dec 4, 2024
a87cab3
Use ones instead of for loop
Yui5427 Dec 4, 2024
29b9a43
Use bool_to_bit instead of if
Yui5427 Dec 4, 2024
fc1c31c
Remove assert('n > 0)
Yui5427 Dec 14, 2024
7eea7ac
Use bool_to_bit and remove (^ ones()) bit manipulation
Yui5427 Dec 15, 2024
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166 changes: 83 additions & 83 deletions model/riscv_insts_vext_arith.sail
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84 changes: 42 additions & 42 deletions model/riscv_insts_vext_fp.sail
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,7 @@ function clause execute(FVVTYPE(funct6, vm, vs2, vs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vs1_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
Expand All @@ -51,7 +51,7 @@ function clause execute(FVVTYPE(funct6, vm, vs2, vs1, vd)) = {
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FVV_VADD => fp_add(rm_3b, vs2_val[i], vs1_val[i]),
FVV_VSUB => fp_sub(rm_3b, vs2_val[i], vs1_val[i]),
Expand Down Expand Up @@ -116,7 +116,7 @@ function clause execute(FVVMATYPE(funct6, vm, vs2, vs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vs1_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
Expand All @@ -125,7 +125,7 @@ function clause execute(FVVMATYPE(funct6, vm, vs2, vs1, vd)) = {
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FVV_VMACC => fp_muladd(rm_3b, vs1_val[i], vs2_val[i], vd_val[i]),
FVV_VNMACC => fp_nmulsub(rm_3b, vs1_val[i], vs2_val[i], vd_val[i]),
Expand Down Expand Up @@ -188,7 +188,7 @@ function clause execute(FWVVTYPE(funct6, vm, vs2, vs1, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let vs1_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
Expand All @@ -197,7 +197,7 @@ function clause execute(FWVVTYPE(funct6, vm, vs2, vs1, vd)) = {
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FWVV_VADD => fp_add(rm_3b, fp_widen(vs2_val[i]), fp_widen(vs1_val[i])),
FWVV_VSUB => fp_sub(rm_3b, fp_widen(vs2_val[i]), fp_widen(vs1_val[i])),
Expand Down Expand Up @@ -252,7 +252,7 @@ function clause execute(FWVVMATYPE(funct6, vm, vs1, vs2, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let vs1_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
Expand All @@ -261,7 +261,7 @@ function clause execute(FWVVMATYPE(funct6, vm, vs1, vs2, vd)) = {
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FWVV_VMACC => fp_muladd(rm_3b, fp_widen(vs1_val[i]), fp_widen(vs2_val[i]), vd_val[i]),
FWVV_VNMACC => fp_nmulsub(rm_3b, fp_widen(vs1_val[i]), fp_widen(vs2_val[i]), vd_val[i]),
Expand Down Expand Up @@ -314,7 +314,7 @@ function clause execute(FWVTYPE(funct6, vm, vs2, vs1, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let vs1_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vs2);
Expand All @@ -323,7 +323,7 @@ function clause execute(FWVTYPE(funct6, vm, vs2, vs1, vd)) = {
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FWV_VADD => fp_add(rm_3b, vs2_val[i], fp_widen(vs1_val[i])),
FWV_VSUB => fp_sub(rm_3b, vs2_val[i], fp_widen(vs1_val[i]))
Expand Down Expand Up @@ -371,15 +371,15 @@ function clause execute(VFUNARY0(vm, vs2, vfunary0, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match vfunary0 {
FV_CVT_XU_F => {
let (fflags, elem) : (bits_fflags, bits('m)) = match 'm {
Expand Down Expand Up @@ -489,15 +489,15 @@ function clause execute(VFWUNARY0(vm, vs2, vfwunary0, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match vfwunary0 {
FWV_CVT_XU_F => {
let (fflags, elem) : (bits_fflags, bits('o)) = match 'm {
Expand Down Expand Up @@ -618,15 +618,15 @@ function clause execute(VFNUNARY0(vm, vs2, vfnunary0, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match vfnunary0 {
FNV_CVT_XU_F => {
let (fflags, elem) : (bits_fflags, bits('m)) = match 'm {
Expand Down Expand Up @@ -748,15 +748,15 @@ function clause execute(VFUNARY1(vm, vs2, vfunary1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match vfunary1 {
FVV_VSQRT => {
let (fflags, elem) : (bits_fflags, bits('m)) = match 'm {
Expand Down Expand Up @@ -871,16 +871,16 @@ function clause execute(FVFTYPE(funct6, vm, vs2, rs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
VF_VADD => fp_add(rm_3b, vs2_val[i], rs1_val),
VF_VSUB => fp_sub(rm_3b, vs2_val[i], rs1_val),
Expand Down Expand Up @@ -960,16 +960,16 @@ function clause execute(FVFMATYPE(funct6, vm, vs2, rs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
VF_VMACC => fp_muladd(rm_3b, rs1_val, vs2_val[i], vd_val[i]),
VF_VNMACC => fp_nmulsub(rm_3b, rs1_val, vs2_val[i], vd_val[i]),
Expand Down Expand Up @@ -1031,16 +1031,16 @@ function clause execute(FWVFTYPE(funct6, vm, vs2, rs1, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);

let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FWVF_VADD => fp_add(rm_3b, fp_widen(vs2_val[i]), fp_widen(rs1_val)),
FWVF_VSUB => fp_sub(rm_3b, fp_widen(vs2_val[i]), fp_widen(rs1_val)),
Expand Down Expand Up @@ -1094,16 +1094,16 @@ function clause execute(FWVFMATYPE(funct6, vm, rs1, vs2, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);

let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FWVF_VMACC => fp_muladd(rm_3b, fp_widen(rs1_val), fp_widen(vs2_val[i]), vd_val[i]),
FWVF_VNMACC => fp_nmulsub(rm_3b, fp_widen(rs1_val), fp_widen(vs2_val[i]), vd_val[i]),
Expand Down Expand Up @@ -1155,16 +1155,16 @@ function clause execute(FWFTYPE(funct6, vm, vs2, rs1, vd)) = {
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vs2);

let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
if mask[i] == bitone then {
result[i] = match funct6 {
FWF_VADD => fp_add(rm_3b, vs2_val[i], fp_widen(rs1_val)),
FWF_VSUB => fp_sub(rm_3b, vs2_val[i], fp_widen(rs1_val))
Expand Down Expand Up @@ -1207,8 +1207,8 @@ function clause execute(VFMERGE(vs2, rs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, 0b0, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : bits('n) = read_vmask(num_elem, 0b0, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
var result : vector('n, bits('m)) = vector_init(zeros());
Expand All @@ -1224,7 +1224,7 @@ function clause execute(VFMERGE(vs2, rs1, vd)) = {
}
} else {
/* the merge operates on all body elements */
result[i] = if vm_val[i] then rs1_val else vs2_val[i]
result[i] = if vm_val[i] == bitone then rs1_val else vs2_val[i]
}
};

Expand Down Expand Up @@ -1255,15 +1255,15 @@ function clause execute(VFMV(rs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : vector('n, bool) = read_vmask(num_elem, 0b1, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : bits('n) = read_vmask(num_elem, 0b1, 0b00000);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then result[i] = rs1_val
if mask[i] == bitone then result[i] = rs1_val
};

write_vreg(num_elem, SEW, LMUL_pow, vd, result);
Expand Down Expand Up @@ -1291,15 +1291,15 @@ function clause execute(VFMVSF(rs1, vd)) = {
let 'n = num_elem;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem, 0b1, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : bits('n) = read_vmask(num_elem, 0b1, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vd_val : vector('n, bits('m)) = read_vreg(num_elem, SEW, 0, vd);

let (initial_result, mask) = init_masked_result(num_elem, SEW, 0, vd_val, vm_val);
var result = initial_result;

/* one body element */
if mask[0] then result[0] = rs1_val;
if mask[0] == bitone then result[0] = rs1_val;

/* others treated as tail elements */
let tail_ag : agtype = get_vtype_vta();
Expand Down
16 changes: 8 additions & 8 deletions model/riscv_insts_vext_fp_red.sail
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ mapping encdec_rfvvfunct6 : rfvvfunct6 <-> bits(6) = {
mapping clause encdec = RFVVTYPE(funct6, vm, vs2, vs1, vd) if extensionEnabled(Ext_V)
<-> encdec_rfvvfunct6(funct6) @ vm @ vs2 @ vs1 @ 0b001 @ vd @ 0b1010111 if extensionEnabled(Ext_V)

val process_rfvv_single: forall 'n 'm 'p, 'n >= 0 & 'm in {8, 16, 32, 64}. (rfvvfunct6, bits(1), regidx, regidx, regidx, int('n), int('m), int('p)) -> Retired
val process_rfvv_single: forall 'n 'm 'p, 'n > 0 & 'm in {8, 16, 32, 64}. (rfvvfunct6, bits(1), regidx, regidx, regidx, int('n), int('m), int('p)) -> Retired
function process_rfvv_single(funct6, vm, vs2, vs1, vd, num_elem_vs, SEW, LMUL_pow) = {
let rm_3b = fcsr[FRM];
let num_elem_vd = get_num_elem(0, SEW); /* vd regardless of LMUL setting */
Expand All @@ -40,14 +40,14 @@ function process_rfvv_single(funct6, vm, vs2, vs1, vd, num_elem_vs, SEW, LMUL_po
let 'd = num_elem_vd;
let 'm = SEW;

let vm_val : vector('n, bool) = read_vmask(num_elem_vs, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem_vs, vm, 0b00000);
let vd_val : vector('d, bits('m)) = read_vreg(num_elem_vd, SEW, 0, vd);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem_vs, SEW, LMUL_pow, vs2);
let mask : vector('n, bool) = init_masked_source(num_elem_vs, LMUL_pow, vm_val);
let mask : bits('n) = init_masked_source(num_elem_vs, LMUL_pow, vm_val);

var sum : bits('m) = read_single_element(SEW, 0, vs1); /* vs1 regardless of LMUL setting */
foreach (i from 0 to (num_elem_vs - 1)) {
if mask[i] then {
if mask[i] == bitone then {
sum = match funct6 {
/* currently ordered/unordered sum reductions do the same operations */
FVV_VFREDOSUM => fp_add(rm_3b, sum, vs2_val[i]),
Expand All @@ -66,7 +66,7 @@ function process_rfvv_single(funct6, vm, vs2, vs1, vd, num_elem_vs, SEW, LMUL_po
RETIRE_SUCCESS
}

val process_rfvv_widen: forall 'n 'm 'p, 'n >= 0 & 'm in {8, 16, 32, 64}. (rfvvfunct6, bits(1), regidx, regidx, regidx, int('n), int('m), int('p)) -> Retired
val process_rfvv_widen: forall 'n 'm 'p, 'n > 0 & 'm in {8, 16, 32, 64}. (rfvvfunct6, bits(1), regidx, regidx, regidx, int('n), int('m), int('p)) -> Retired
function process_rfvv_widen(funct6, vm, vs2, vs1, vd, num_elem_vs, SEW, LMUL_pow) = {
let rm_3b = fcsr[FRM];
let SEW_widen = SEW * 2;
Expand All @@ -83,14 +83,14 @@ function process_rfvv_widen(funct6, vm, vs2, vs1, vd, num_elem_vs, SEW, LMUL_pow
let 'm = SEW;
let 'o = SEW_widen;

let vm_val : vector('n, bool) = read_vmask(num_elem_vs, vm, 0b00000);
let vm_val : bits('n) = read_vmask(num_elem_vs, vm, 0b00000);
let vd_val : vector('d, bits('o)) = read_vreg(num_elem_vd, SEW_widen, 0, vd);
let vs2_val : vector('n, bits('m)) = read_vreg(num_elem_vs, SEW, LMUL_pow, vs2);
let mask : vector('n, bool) = init_masked_source(num_elem_vs, LMUL_pow, vm_val);
let mask : bits('n) = init_masked_source(num_elem_vs, LMUL_pow, vm_val);

var sum : bits('o) = read_single_element(SEW_widen, 0, vs1); /* vs1 regardless of LMUL setting */
foreach (i from 0 to (num_elem_vs - 1)) {
if mask[i] then {
if mask[i] == bitone then {
/* currently ordered/unordered sum reductions do the same operations */
sum = fp_add(rm_3b, sum, fp_widen(vs2_val[i]))
}
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