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Merge pull request #2776 from Sonicadvance1/fix_constprop_mask

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ConstProp: Fix shift mask in const-prop
This commit is contained in:
Mai authored and GitHub committed 2023-07-17 12:08:33 -04:00
2 parents 1b1e9e0fb5 08ca43c3c4
commit daeba0625f
1 file changed
+6 -2
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External/FEXCore/Source/Interface/IR/Passes/ConstProp.cpp
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+6 -2
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@@ -732,7 +732,9 @@ bool ConstProp::ConstantPropagation(IREmitter *IREmit, const IRListView& Current
if (IREmit->IsValueConstant(Op->Header.Args[0], &Constant1) &&
IREmit->IsValueConstant(Op->Header.Args[1], &Constant2)) {
uint64_t NewConstant = (Constant1 << Constant2) & getMask(Op);
// Shifts mask the shift amount by 63 or 31 depending on operating size;
uint64_t ShiftMask = IROp->Size == 8 ? 63 : 31;
uint64_t NewConstant = (Constant1 << (Constant2 & ShiftMask)) & getMask(Op);
IREmit->ReplaceWithConstant(CodeNode, NewConstant);
Changed = true;
}
@@ -758,7 +760,9 @@ bool ConstProp::ConstantPropagation(IREmitter *IREmit, const IRListView& Current
if (IREmit->IsValueConstant(Op->Header.Args[0], &Constant1) &&
IREmit->IsValueConstant(Op->Header.Args[1], &Constant2)) {
uint64_t NewConstant = (Constant1 >> Constant2) & getMask(Op);
// Shifts mask the shift amount by 63 or 31 depending on operating size;
uint64_t ShiftMask = IROp->Size == 8 ? 63 : 31;
uint64_t NewConstant = (Constant1 >> (Constant2 & ShiftMask)) & getMask(Op);
IREmit->ReplaceWithConstant(CodeNode, NewConstant);
Changed = true;
}