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constant_propagation_pass: Fold ZeroExtend{Type}ToLong opcodes if possible

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These are equivalent to the ZeroExtendXToWord variants, so we can
trivially do this as well.
This commit is contained in:
Lioncash 2018-10-05 18:00:15 -04:00 committed by MerryMage
parent 2274214ff0
commit c42f6ea184
1 changed files with 14 additions and 0 deletions
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14
src/ir_opt/constant_propagation_pass.cpp
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@ -122,6 +122,15 @@ void FoldZeroExtendXToWord(IR::Inst& inst) {
const u64 value = inst.GetArg(0).GetImmediateAsU64();
inst.ReplaceUsesWith(IR::Value{static_cast<u32>(value)});
}
void FoldZeroExtendXToLong(IR::Inst& inst) {
if (!inst.AreAllArgsImmediates()) {
return;
}
const u64 value = inst.GetArg(0).GetImmediateAsU64();
inst.ReplaceUsesWith(IR::Value{value});
}
} // Anonymous namespace
void ConstantPropagation(IR::Block& block) {
@ -167,6 +176,11 @@ void ConstantPropagation(IR::Block& block) {
case IR::Opcode::ZeroExtendHalfToWord:
FoldZeroExtendXToWord(inst);
break;
case IR::Opcode::ZeroExtendByteToLong:
case IR::Opcode::ZeroExtendHalfToLong:
case IR::Opcode::ZeroExtendWordToLong:
FoldZeroExtendXToLong(inst);
break;
default:
break;
}