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f80 stack xchg optimization for fast path

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Paulo Matos committed 2025-11-05 11:20:02 +01:00
1 parent 438501e49c
commit 6ee9984280
1 file changed
+19 -4
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FEXCore/Source/Interface/IR/Passes/x87StackOptimizationPass.cpp
+19 -4
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@@ -1036,11 +1036,26 @@ void X87StackOptimization::Run(IREmitter* Emit) {
case OP_F80STACKXCHANGE: {
const auto* Op = IROp->C<IROp_F80StackXchange>();
auto Offset = Op->SrcStack;
Ref ValueTop = LoadStackValue();
Ref ValueOffset = LoadStackValue(Offset);
StoreStackValue(ValueOffset);
StoreStackValue(ValueTop, Offset);
if (Offset == 0) {
// No-op
break;
}
const auto [ValidTop, StackMemberTop] = StackData.top(0);
const auto [ValidOffset, StackMemberOffset] = StackData.top(Offset);
if (ValidTop != StackSlot::VALID || ValidOffset != StackSlot::VALID) {
// Slow path: do actual memory operations
Ref ValueTop = LoadStackValue();
Ref ValueOffset = LoadStackValue(Offset);
StoreStackValue(ValueOffset);
StoreStackValue(ValueTop, Offset);
} else {
// Fast path: swap complete StackMemberInfo preserving Source metadata
StackData.setTop(StackMemberOffset, 0);
StackData.setTop(StackMemberTop, Offset);
}
break;
}