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RA/SRA: Don't read-alias not full sized regs, it is not safe

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Stefanos Kornilios Mitsis Poiitidis committed 2021-01-05 17:14:57 +02:00
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commit b3600a453c
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External/FEXCore/Source/Interface/IR/Passes/RegisterAllocationPass.cpp
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@@ -509,9 +509,9 @@ namespace FEXCore::IR {
auto IsAliasable = [](uint8_t Size, RegisterClassType StaticClass, uint32_t Offset) {
if (StaticClass == GPRFixedClass) {
return (Size == 8 || Size == 4) && ((Offset & 7) == 0); // lower values depend on z-ext semantics
return (Size == 8 /*|| Size == 4*/) && ((Offset & 7) == 0); // We need more meta info to support not-size-of-reg
} else if (StaticClass == FPRFixedClass) {
return (Size == 16 || Size == 8 || Size == 4) && ((Offset & 15) == 0); // maybe 2 and 1 are safe too
return (Size == 16 /*|| Size == 8 || Size == 4*/) && ((Offset & 15) == 0); // We need more meta info to support not-size-of-reg
} else {
assert(false);
}