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[Qemu-devel] [PATCH v2 05/10] target-arm: optimize arm load/store multip
From: |
juha . riihimaki |
Subject: |
[Qemu-devel] [PATCH v2 05/10] target-arm: optimize arm load/store multiple ops |
Date: |
Sat, 24 Oct 2009 15:19:04 +0300 |
From: Juha Riihimäki <address@hidden>
RM 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 ARM load/
store multiple instruction if there are more than one register
accessed, otherwise the number of generated TCG ops is the same.
Signed-off-by: Juha Riihimäki <address@hidden>
Acked-by: Laurent Desnogues <address@hidden>
---
target-arm/translate.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 38fb833..d1e2ed2 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -6852,6 +6852,7 @@ static void disas_arm_insn(CPUState * env, DisasContext
*s)
}
rn = (insn >> 16) & 0xf;
addr = load_reg(s, rn);
+ tmp2 = tcg_const_i32(4);
/* compute total size */
loaded_base = 0;
@@ -6865,7 +6866,7 @@ static void disas_arm_insn(CPUState * env, DisasContext
*s)
if (insn & (1 << 23)) {
if (insn & (1 << 24)) {
/* pre increment */
- tcg_gen_addi_i32(addr, addr, 4);
+ tcg_gen_add_i32(addr, addr, tmp2);
} else {
/* post increment */
}
@@ -6918,7 +6919,7 @@ static void disas_arm_insn(CPUState * env, DisasContext
*s)
j++;
/* no need to add after the last transfer */
if (j != n)
- tcg_gen_addi_i32(addr, addr, 4);
+ tcg_gen_add_i32(addr, addr, tmp2);
}
}
if (insn & (1 << 21)) {
@@ -6928,7 +6929,7 @@ static void disas_arm_insn(CPUState * env, DisasContext
*s)
/* pre increment */
} else {
/* post increment */
- tcg_gen_addi_i32(addr, addr, 4);
+ tcg_gen_add_i32(addr, addr, tmp2);
}
} else {
if (insn & (1 << 24)) {
@@ -6944,6 +6945,7 @@ static void disas_arm_insn(CPUState * env, DisasContext
*s)
} else {
dead_tmp(addr);
}
+ tcg_temp_free_i32(tmp2);
if (loaded_base) {
store_reg(s, rn, loaded_var);
}
--
1.6.5
[Qemu-devel] [PATCH v2 07/10] target-arm: optimize thumb2 load/store multiple ops, juha . riihimaki, 2009/10/24
[Qemu-devel] [PATCH v2 09/10] target-arm: optimize neon vld/vst ops, juha . riihimaki, 2009/10/24