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OpcodeDispatcher: skip OF calc for constant rotate >= 2

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig 2024-01-24 21:20:03 -04:00
parent 34fdb14da1
commit a57cebaf58
1 changed files with 10 additions and 5 deletions
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15
FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
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@ -2601,9 +2601,11 @@ void OpDispatchBuilder::RCRSmallerOp(OpcodeArgs) {
// OF is the top two MSBs XOR'd together
// Only when Shift == 1, it is undefined otherwise
// Make it easier, just store it regardless
auto NewOF = _Xor(IR::SizeToOpSize(std::max<uint8_t>(4u, GetOpSize(Res))), _Bfe(OpSize::i64Bit, 1, Size - 1, Res), _Bfe(OpSize::i64Bit, 1, Size - 2, Res));
SetRFLAG<FEXCore::X86State::RFLAG_OF_RAW_LOC>(NewOF);
uint64_t SrcConst;
if (!IsValueConstant(WrapNode(Src), &SrcConst) || SrcConst == 1) {
auto NewOF = _Xor(IR::SizeToOpSize(std::max<uint8_t>(4u, GetOpSize(Res))), _Bfe(OpSize::i64Bit, 1, Size - 1, Res), _Bfe(OpSize::i64Bit, 1, Size - 2, Res));
SetRFLAG<FEXCore::X86State::RFLAG_OF_RAW_LOC>(NewOF);
}
});
}
@ -2760,8 +2762,11 @@ void OpDispatchBuilder::RCLSmallerOp(OpcodeArgs) {
// OF is the XOR of the NewCF and the MSB of the result
// Only defined for 1-bit rotates.
auto NewOF = _Xor(OpSize::i64Bit, _Bfe(OpSize::i64Bit, 1, Size - 1, Res), NewCF);
SetRFLAG<FEXCore::X86State::RFLAG_OF_RAW_LOC>(NewOF);
uint64_t SrcConst;
if (!IsValueConstant(WrapNode(Src), &SrcConst) || SrcConst == 1) {
auto NewOF = _Xor(OpSize::i64Bit, _Bfe(OpSize::i64Bit, 1, Size - 1, Res), NewCF);
SetRFLAG<FEXCore::X86State::RFLAG_OF_RAW_LOC>(NewOF);
}
});
}