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OpcodeDispatcher: optimize cdq

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prereq to optimizing sign-ext+ldiv in a reasonable way.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig committed 2025-06-03 15:00:06 -04:00
1 parent ba162bb058
commit 6864d48dcf
1 file changed
+3 -3
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+3 -3
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@@ -1044,9 +1044,9 @@ void OpDispatchBuilder::CMPOp(OpcodeArgs, uint32_t SrcIndex) {
}
void OpDispatchBuilder::CQOOp(OpcodeArgs) {
Ref Src = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags);
auto Size = GetSrcSize(Op);
Ref Upper = _Sbfe(OpSize::i64Bit, 1, Size * 8 - 1, Src);
Ref Src = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = true});
auto Size = OpSizeFromSrc(Op);
Ref Upper = _Sbfe(std::max(OpSize::i32Bit, Size), 1, GetSrcBitSize(Op) - 1, Src);
StoreResult(GPRClass, Op, Upper, OpSize::iInvalid);
}