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[Qemu-devel] [PATCH v2 2/9] tcg/optimize: split expression simplificatio
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH v2 2/9] tcg/optimize: split expression simplification |
Date: |
Fri, 7 Sep 2012 15:16:25 +0200 |
Split expression simplification in multiple parts so that a given op
can appear multiple times. This patch should not change anything.
Reviewed-by: Richard Henderson <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
---
tcg/optimize.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 9c65474..63f970d 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -322,7 +322,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t
*tcg_opc_ptr,
break;
}
- /* Simplify expression if possible. */
+ /* Simplify expression for "op r, a, 0 => mov r, a" cases */
switch (op) {
CASE_OP_32_64(add):
CASE_OP_32_64(sub):
@@ -352,6 +352,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
continue;
}
break;
+ default:
+ break;
+ }
+
+ /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
+ switch (op) {
CASE_OP_32_64(mul):
if ((temps[args[2]].state == TCG_TEMP_CONST
&& temps[args[2]].val == 0)) {
@@ -362,6 +368,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
continue;
}
break;
+ default:
+ break;
+ }
+
+ /* Simplify expression for "op r, a, a => mov r, a" cases */
+ switch (op) {
CASE_OP_32_64(or):
CASE_OP_32_64(and):
if (args[1] == args[2]) {
--
1.7.10.4
- [Qemu-devel] [PATCH v2 0/9] Improve TCG optimizer, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 2/9] tcg/optimize: split expression simplification,
Aurelien Jarno <=
- [Qemu-devel] [PATCH v2 1/9] tcg: improve profiler, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 3/9] tcg/optimize: simplify or/xor r, a, 0 cases, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 4/9] tcg/optimize: simplify and r, a, 0 cases, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 9/9] tcg/optimize: fix if/else/break coding style, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 8/9] tcg/optimize: add constant folding for brcond, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 5/9] tcg/optimize: simplify shift/rot r, 0, a => movi r, 0 cases, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 7/9] tcg/optimize: add constant folding for setcond, Aurelien Jarno, 2012/09/07
- [Qemu-devel] [PATCH v2 6/9] tcg/optimize: swap brcond/setcond arguments when possible, Aurelien Jarno, 2012/09/07
- Re: [Qemu-devel] [PATCH v2 0/9] Improve TCG optimizer, Blue Swirl, 2012/09/08