From 65a7cce17ddf6fa1a30d4315da1631d9b6c8fd31 Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Thu, 6 Sep 2012 16:47:14 +0200 Subject: tcg/optimize: swap brcond/setcond arguments when possible 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 Signed-off-by: Aurelien Jarno --- tcg/optimize.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/tcg/optimize.c b/tcg/optimize.c index 1698ba39b..7debc8a36 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; } -- cgit v1.2.3