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OpcodeDispatcher: Preserve IE exception flag for FCOMI and FTST

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Simon Scherer committed 2026-09-02 07:42:04 +02:00
1 parent b29561e131
commit 4a7fda4516
1 file changed
+6 -3
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FEXCore/Source/Interface/Core/OpcodeDispatcher/X87.cpp
+6 -3
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@@ -172,8 +172,9 @@ void OpDispatchBuilder::FIST(OpcodeArgs, bool Truncate) {
Ref IsOverflow = _NZCVSelect01(CondClass::UGE);
// Set Invalid Operation flag if overflow or special value
// The x87 exception flags are sticky. Preserve earlier result
Ref InvalidFlag = _Or(OpSize::i64Bit, IsSpecial, IsOverflow);
SetRFLAG<FEXCore::X86State::X87FLAG_IE_LOC>(InvalidFlag);
SetRFLAG<FEXCore::X86State::X87FLAG_IE_LOC>(_Or(OpSize::i32Bit, GetRFLAG(FEXCore::X86State::X87FLAG_IE_LOC), InvalidFlag));
}
Data = _F80CVTInt(Size, Data, Truncate);
@@ -683,7 +684,8 @@ void OpDispatchBuilder::FCOMI(OpcodeArgs, IR::OpSize Width, bool Integer, OpDisp
}
// Set Invalid Operation flag when unordered (NaN comparison)
SetRFLAG<FEXCore::X86State::X87FLAG_IE_LOC>(HostFlag_Unordered);
// The x87 exception flags are sticky. Preserve earlier result
SetRFLAG<FEXCore::X86State::X87FLAG_IE_LOC>(_Or(OpSize::i32Bit, GetRFLAG(FEXCore::X86State::X87FLAG_IE_LOC), HostFlag_Unordered));
if (PopTwice) {
_PopStackDestroy();
@@ -708,7 +710,8 @@ void OpDispatchBuilder::FTST(OpcodeArgs) {
SetRFLAG<FEXCore::X86State::X87FLAG_C3_LOC>(HostFlag_ZF);
// Set Invalid Operation flag when unordered (NaN comparison)
SetRFLAG<FEXCore::X86State::X87FLAG_IE_LOC>(HostFlag_Unordered);
// The x87 exception flags are sticky. Preserve earlier result
SetRFLAG<FEXCore::X86State::X87FLAG_IE_LOC>(_Or(OpSize::i32Bit, GetRFLAG(FEXCore::X86State::X87FLAG_IE_LOC), HostFlag_Unordered));
}
void OpDispatchBuilder::X87OpHelper(OpcodeArgs, FEXCore::IR::IROps IROp, bool ZeroC2) {