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constant_propagation_pass: x + 0 == x

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Merry 2024-01-30 23:10:23 +00:00
parent ca2cc2c4ba
commit 24bf921ff9
1 changed files with 8 additions and 0 deletions
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8
src/dynarmic/ir/opt/constant_propagation_pass.cpp
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@ -96,10 +96,18 @@ void FoldAdd(IR::Inst& inst, bool is_32_bit) {
const IR::Inst* lhs_inst = lhs.GetInstRecursive();
if (lhs_inst->GetOpcode() == inst.GetOpcode() && lhs_inst->GetArg(1).IsImmediate() && lhs_inst->GetArg(2).IsImmediate()) {
const u64 combined = rhs.GetImmediateAsU64() + lhs_inst->GetArg(1).GetImmediateAsU64() + lhs_inst->GetArg(2).GetU1();
if (combined == 0) {
inst.ReplaceUsesWith(lhs_inst->GetArg(0));
return;
}
inst.SetArg(0, lhs_inst->GetArg(0));
inst.SetArg(1, Value(is_32_bit, combined));
return;
}
if (rhs.IsZero() && carry.IsZero()) {
inst.ReplaceUsesWith(lhs);
return;
}
}
if (inst.AreAllArgsImmediates()) {