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constant_propagation_pass: Combine zero-extension folding code into its own function

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Separates the behavior from the actual switch statement and gets rid of
duplication, now that we can use the general GetImmediateAsU64()
function.
This commit is contained in:
Lioncash 2018-10-05 17:45:33 -04:00
parent 86539d97d3
commit e0eec323f2
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 17 deletions
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29
src/ir_opt/constant_propagation_pass.cpp
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@ -113,6 +113,15 @@ void FoldOR(IR::Inst& inst, bool is_32_bit) {
inst.ReplaceUsesWith(lhs);
}
}
void FoldZeroExtendXToWord(IR::Inst& inst) {
if (!inst.AreAllArgsImmediates()) {
return;
}
const u64 value = inst.GetArg(0).GetImmediateAsU64();
inst.ReplaceUsesWith(IR::Value{static_cast<u32>(value)});
}
} // Anonymous namespace
void ConstantPropagation(IR::Block& block) {
@ -154,24 +163,10 @@ void ConstantPropagation(IR::Block& block) {
case IR::Opcode::Not64:
FoldNOT(inst, opcode == IR::Opcode::Not32);
break;
case IR::Opcode::ZeroExtendByteToWord: {
if (!inst.AreAllArgsImmediates())
break;
u8 byte = inst.GetArg(0).GetU8();
u32 value = static_cast<u32>(byte);
inst.ReplaceUsesWith(IR::Value{value});
case IR::Opcode::ZeroExtendByteToWord:
case IR::Opcode::ZeroExtendHalfToWord:
FoldZeroExtendXToWord(inst);
break;
}
case IR::Opcode::ZeroExtendHalfToWord: {
if (!inst.AreAllArgsImmediates())
break;
u16 half = inst.GetArg(0).GetU16();
u32 value = static_cast<u32>(half);
inst.ReplaceUsesWith(IR::Value{value});
break;
}
default:
break;
}