Only and only if src1 is a power of 2 we can replace IMAD by SHLADD.
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index 74a5a85..336f407 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -915,6 +915,7 @@ ConstantFolding::opnd3(Instruction *i, ImmediateValue &imm2)
void
ConstantFolding::opnd(Instruction *i, ImmediateValue &imm0, int s)
{
+ const Target *target = prog->getTarget();
const int t = !s;
const operation op = i->op;
Instruction *newi = i;
@@ -1016,6 +1017,18 @@ ConstantFolding::opnd(Instruction *i, ImmediateValue
&imm0, int s)
i->src(1).mod = i->src(2).mod;
i->setSrc(2, NULL);
i->op = OP_ADD;
+ } else
+ if (s == 1 && imm0.isPow2() && target->isOpSupported(i->op, i->dType)) {
+ int32_t v;
+ switch (i->dType) {
+ case TYPE_S32: v = util_last_bit_signed(imm0.reg.data.s32) - 1; break;
+ case TYPE_U32: v = util_last_bit(imm0.reg.data.u32) - 1; break;
+ default:
+ return;
+ }
+ bld.setPosition(i, false);
+ i->op = OP_SHLADD;
+ i->setSrc(1, bld.mkImm(v));
}
break;
case OP_ADD:
--
2.10.0
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