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[Qemu-devel] [PATCH 4/9] tcg/optimize: do copy propagation for all opera
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH 4/9] tcg/optimize: do copy propagation for all operations |
Date: |
Wed, 19 Sep 2012 22:00:18 +0200 |
It is possible to do copy propagation for all operations, even the ones
that have side effects or clobber arguments (it only concerns input
arguments). That said, the call operation should be handled differently
due to the variable number of arguments.
Signed-off-by: Aurelien Jarno <address@hidden>
---
tcg/optimize.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 244eb02..a58de3b 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -376,8 +376,15 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
op = gen_opc_buf[op_index];
def = &tcg_op_defs[op];
/* Do copy propagation */
- if (!(def->flags & (TCG_OPF_CALL_CLOBBER | TCG_OPF_SIDE_EFFECTS))) {
- assert(op != INDEX_op_call);
+ if (op == INDEX_op_call) {
+ int nb_oargs = args[0] >> 16;
+ int nb_iargs = args[0] & 0xffff;
+ for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
+ if (temps[args[i]].state == TCG_TEMP_COPY) {
+ args[i] = find_better_copy(s, args[i]);
+ }
+ }
+ } else {
for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
if (temps[args[i]].state == TCG_TEMP_COPY) {
args[i] = find_better_copy(s, args[i]);
--
1.7.10.4
- [Qemu-devel] [PATCH 0/9] tcg/optimize: rework copy propagation, Aurelien Jarno, 2012/09/19
- [Qemu-devel] [PATCH 6/9] tcg/optimize: optimize "op r, a, a => movi r, 0", Aurelien Jarno, 2012/09/19
- [Qemu-devel] [PATCH 4/9] tcg/optimize: do copy propagation for all operations,
Aurelien Jarno <=
- [Qemu-devel] [PATCH 1/9] tcg/optimizer: remove TCG_TEMP_ANY, Aurelien Jarno, 2012/09/19
- [Qemu-devel] [PATCH 9/9] tcg: remove #ifdef #endif around TCGOpcode tests, Aurelien Jarno, 2012/09/19
- [Qemu-devel] [PATCH 2/9] tcg/optimizer: check types in copy propagation, Aurelien Jarno, 2012/09/19
- [Qemu-devel] [PATCH 7/9] tcg/optimize: further optimize brcond/setcond, Aurelien Jarno, 2012/09/19