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authorKarol Herbst <[email protected]>2016-10-06 00:36:23 +0200
committerSamuel Pitoiset <[email protected]>2016-10-06 19:39:51 +0200
commitf96945c5b5c3a52685e76795f03f75c75fb62fc7 (patch)
tree306c03a489c8d124ff26c6f4eed9241d26615a16 /src
parent6963f94e98e9b0a1432bc0071d495c9e31b899ae (diff)
nv50/ir: optimize sub(a, 0) to a
helped some ue4 demos and divinity OS shaders total instructions in shared programs : 2818674 -> 2818606 (-0.00%) total gprs used in shared programs : 379273 -> 379273 (0.00%) total local used in shared programs : 9505 -> 9505 (0.00%) total bytes used in shared programs : 25837792 -> 25837192 (-0.00%) local gpr inst bytes helped 0 0 33 33 hurt 0 0 0 0 Signed-off-by: Karol Herbst <[email protected]> Reviewed-by: Ilia Mirkin <[email protected]> Reviewed-by: Pierre Moreau <[email protected]>
Diffstat (limited to 'src')
-rw-r--r--src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index 9875738593e..1c71155f811 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -1037,12 +1037,15 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
}
break;
case OP_ADD:
+ case OP_SUB:
if (i->usesFlags())
break;
if (imm0.isInteger(0)) {
if (s == 0) {
i->setSrc(0, i->getSrc(1));
i->src(0).mod = i->src(1).mod;
+ if (i->op == OP_SUB)
+ i->src(0).mod = i->src(0).mod ^ Modifier(NV50_IR_MOD_NEG);
}
i->setSrc(1, NULL);
i->op = i->src(0).mod.getOp();