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OpcodeDispatcher: shuffle SBC flag order

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avoids clobbering nzcv

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig 2024-02-26 16:43:47 -04:00
parent 91cef6b76f
commit f3d55dd721
1 changed files with 5 additions and 12 deletions
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17
FEXCore/Source/Interface/Core/OpcodeDispatcher/Flags.cpp
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@ -519,19 +519,12 @@ OrderedNode *OpDispatchBuilder::CalculateFlags_SBB(uint8_t SrcSize, OrderedNode
Res = _Sub(OpSize, Src1, _Add(OpSize, Src2, CF));
Res = _Bfe(OpSize, SrcSize * 8, 0, Res);
// SF/ZF
auto SelectOpLT = _Select(FEXCore::IR::COND_UGT, Res, Src1, One, Zero);
auto SelectOpLE = _Select(FEXCore::IR::COND_UGE, Res, Src1, One, Zero);
auto SelectCF = _Select(FEXCore::IR::COND_EQ, CF, One, SelectOpLE, SelectOpLT);
SetNZ_ZeroCV(SrcSize, Res);
// CF
// Unsigned
{
auto SelectOpLT = _Select(FEXCore::IR::COND_UGT, Res, Src1, One, Zero);
auto SelectOpLE = _Select(FEXCore::IR::COND_UGE, Res, Src1, One, Zero);
auto SelectCF = _Select(FEXCore::IR::COND_EQ, CF, One, SelectOpLE, SelectOpLT);
SetRFLAG<FEXCore::X86State::RFLAG_CF_RAW_LOC>(SelectCF);
}
// Signed
SetRFLAG<FEXCore::X86State::RFLAG_CF_RAW_LOC>(SelectCF);
CalculateOF(SrcSize, Res, Src1, Src2, true);
}