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nv50/ir: optimize IMAD to SHLADD in presence of power of 2 

Only and only if src1 is a power of 2 we can replace IMAD by SHLADD.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Samuel Pitoiset 2016-09-14 18:49:36 +02:00
parent 31545b64b8
commit e4eb0fca02
1 changed files with 7 additions and 0 deletions
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7
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -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 +1017,12 @@ 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.isNegative() && imm0.isPow2() &&
target->isOpSupported(i->op, i->dType)) {
i->op = OP_SHLADD;
imm0.applyLog2();
i->setSrc(1, new_ImmediateValue(prog, imm0.reg.data.u32));
}
break;
case OP_ADD: