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[Qemu-devel] [PATCH v2 6/9] tcg/optimize: swap brcond/setcond arguments
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH v2 6/9] tcg/optimize: swap brcond/setcond arguments when possible |
Date: |
Fri, 7 Sep 2012 15:16:29 +0200 |
brcond and setcond ops are not commutative, but it's easy to compute the
new condition after swapping the arguments. Try to always put the constant
argument in second position like for commutative ops, to help backends to
generate better code.
Reviewed-by: Richard Henderson <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
---
tcg/optimize.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 1698ba3..7debc8a 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -318,6 +318,24 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
args[2] = tmp;
}
break;
+ CASE_OP_32_64(brcond):
+ if (temps[args[0]].state == TCG_TEMP_CONST
+ && temps[args[1]].state != TCG_TEMP_CONST) {
+ tmp = args[0];
+ args[0] = args[1];
+ args[1] = tmp;
+ args[2] = tcg_swap_cond(args[2]);
+ }
+ break;
+ CASE_OP_32_64(setcond):
+ if (temps[args[1]].state == TCG_TEMP_CONST
+ && temps[args[2]].state != TCG_TEMP_CONST) {
+ tmp = args[1];
+ args[1] = args[2];
+ args[2] = tmp;
+ args[3] = tcg_swap_cond(args[3]);
+ }
+ break;
default:
break;
}
--
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, 2012/09/07
- [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 <=
- Re: [Qemu-devel] [PATCH v2 0/9] Improve TCG optimizer, Blue Swirl, 2012/09/08
Re: [Qemu-devel] [PATCH v2 0/9] Improve TCG optimizer, Richard Henderson, 2012/09/10