Thumb2 load/store multiple instructions can be slightly optimized by loading the register offset constant into a variable outside the register loop and using the preloaded variable inside the loop instead of reloading the offset value to a temporary variable on each loop iteration. This causes less TCG ops to be generated for a Thumb2 load/ store multiple instruction.
Signed-off-by: Juha Riihimäki <juha.riihim...@nokia.com>
---
diff --git a/target-arm/translate.c b/target-arm/translate.c
index c92ecc6..abb3105 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -7370,6 +7370,7 @@ static int disas_thumb2_insn(CPUState *env,
DisasContext *s, uint16_t insn_hw1)
tcg_gen_addi_i32(addr, addr, -offset);
}
+ tmp2 = tcg_const_i32(4);
for (i = 0; i < 16; i++) {
if ((insn & (1 << i)) == 0)
continue;
@@ -7386,8 +7387,9 @@ static int disas_thumb2_insn(CPUState *env,
DisasContext *s, uint16_t insn_hw1)
tmp = load_reg(s, i);
gen_st32(tmp, addr, IS_USER(s));
}
- tcg_gen_addi_i32(addr, addr, 4);
+ tcg_gen_add_i32(addr, addr, tmp2);
}
+ tcg_temp_free_i32(tmp2);
if (insn & (1 << 21)) {
/* Base register writeback. */
if (insn & (1 << 24)) {
translate.c.t2ldmstm.diff
Description: translate.c.t2ldmstm.diff
