From 074aaf5bd7505c84f0470d45b4275bc10975faa7 Mon Sep 17 00:00:00 2001
From: Vacantron Chen <e24081030@gs.ncku.edu.tw>
Date: Sun, 17 Dec 2023 01:08:00 +0800
Subject: [PATCH] Fix branch-misses on Raspberry Pi 3B

According to "Arm Cortex-A53 MPCore Processor Technical Reference
Manual", the data-processing instructions using the PC as a
destination register is not predicted. Replace the `MOV pc, ...`
with `BLX` or `POP` instruction.

Ref: #93
---
 src/arm-codegen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/arm-codegen.c b/src/arm-codegen.c
index 731f7e56..77bc6769 100644
--- a/src/arm-codegen.c
+++ b/src/arm-codegen.c
@@ -315,7 +315,7 @@ void emit_ph2_ir(ph2_ir_t *ph2_ir)
         emit(__movt(__AL, __r8, ph2_ir->src1 + 4));
         emit(__add_r(__AL, __sp, __sp, __r8));
         emit(__lw(__AL, __lr, __sp, -4));
-        emit(__mov_r(__AL, __pc, __lr));
+        emit(__blx(__AL, __lr));
         return;
     case OP_add:
         emit(__add_r(__AL, rd, rn, rm));