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irjit: Reduce unnecessary shuffles.

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If it's never used as a Vec4 again, it's often not worth it.
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2023-09-01 22:35:59 -07:00
parent 5f84887dea
commit 96c90c19c6
1 changed files with 15 additions and 1 deletions
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Core/MIPS/IR/IRPassSimplify.cpp
+15 -1
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@@ -1981,6 +1981,20 @@ bool ReduceVec4Flush(const IRWriter &in, IRWriter &out, const IROptions &opts) {
return false;
};
auto usedLaterAsVec4 = [&](IRReg r) {
for (int j = i + 1; j < inCount; ++j) {
IRInst inst = in.GetInstructions()[j];
const IRMeta *m = GetIRMeta(inst.op);
if (m->types[0] == 'V' && inst.dest == r)
return true;
if (m->types[1] == 'V' && inst.src1 == r)
return true;
if (m->types[2] == 'V' && inst.src2 == r)
return true;
}
return false;
};
switch (inst.op) {
case IROp::SetConstF:
if (isVec4[inst.dest & ~3] && findAvailTempVec4()) {
@@ -2063,7 +2077,7 @@ bool ReduceVec4Flush(const IRWriter &in, IRWriter &out, const IROptions &opts) {
case IROp::FSub:
case IROp::FMul:
case IROp::FDiv:
if (isVec4[inst.dest & ~3] && isVec4Dirty[inst.dest & ~3] && findAvailTempVec4()) {
if (isVec4[inst.dest & ~3] && isVec4Dirty[inst.dest & ~3] && usedLaterAsVec4(inst.dest & ~3) && findAvailTempVec4()) {
u8 blendMask = 1 << (inst.dest & 3);
out.Write(inst.op, temp, inst.src1, inst.src2);
out.Write(IROp::Vec4Shuffle, temp, temp, 0);