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constant_propagation_pass: Fold IsZero

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This commit is contained in:
MerryMage 2020-04-22 00:20:38 +01:00
parent df1a0eecaf
commit d51a83d265
1 changed files with 10 additions and 0 deletions
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10
src/ir_opt/constant_propagation_pass.cpp
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@ -337,6 +337,16 @@ void ConstantPropagation(IR::Block& block) {
case Op::MostSignificantBit: case Op::MostSignificantBit:
FoldMostSignificantBit(inst); FoldMostSignificantBit(inst);
break; break;
case Op::IsZero32:
if (inst.AreAllArgsImmediates()) {
inst.ReplaceUsesWith(IR::Value{inst.GetArg(0).GetU32() == 0});
}
break;
case Op::IsZero64:
if (inst.AreAllArgsImmediates()) {
inst.ReplaceUsesWith(IR::Value{inst.GetArg(0).GetU64() == 0});
}
break;
case Op::LogicalShiftLeft32: case Op::LogicalShiftLeft32:
if (FoldShifts(inst)) { if (FoldShifts(inst)) {
ReplaceUsesWith(inst, true, Safe::LogicalShiftLeft<u32>(inst.GetArg(0).GetU32(), inst.GetArg(1).GetU8())); ReplaceUsesWith(inst, true, Safe::LogicalShiftLeft<u32>(inst.GetArg(0).GetU32(), inst.GetArg(1).GetU8()));