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OpcodeDispatcher: use axflag for x87-f64 fcmp

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only 1 instr saved but meh.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig committed 2023-11-17 17:37:24 -04:00
1 parent d1e43d94e9
commit 3dfb94b524
1 file changed
+20 -5
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FEXCore/Source/Interface/Core/OpcodeDispatcher.h
+20 -5
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@@ -1474,16 +1474,31 @@ private:
}
}
// Set x87 comparison flags based on the result set by Arm FCMP
// Set x87 comparison flags based on the result set by Arm FCMP. Clobbers
// NZCV on flagm2 platforms.
void ConvertNZCVToX87() {
OrderedNode *Z = GetRFLAG(FEXCore::X86State::RFLAG_ZF_RAW_LOC);
OrderedNode *N = GetRFLAG(FEXCore::X86State::RFLAG_SF_RAW_LOC);
OrderedNode *V = GetRFLAG(FEXCore::X86State::RFLAG_OF_RAW_LOC);
SetRFLAG<FEXCore::X86State::X87FLAG_C0_LOC>(_Or(OpSize::i32Bit, N, V));
if (CTX->HostFeatures.SupportsFlagM2) {
LOGMAN_THROW_A_FMT(!NZCVDirty, "only expected after fcmp");
// Convert to x86 flags, saves us from or'ing after.
_AXFlag();
PossiblySetNZCVBits = ~0;
// Copy the values. CF is inverted from the axflag result, ZF is as-is.
SetRFLAG<FEXCore::X86State::X87FLAG_C0_LOC>(GetRFLAG(FEXCore::X86State::RFLAG_CF_RAW_LOC, true));
SetRFLAG<FEXCore::X86State::X87FLAG_C3_LOC>(GetRFLAG(FEXCore::X86State::RFLAG_ZF_RAW_LOC));
} else {
OrderedNode *Z = GetRFLAG(FEXCore::X86State::RFLAG_ZF_RAW_LOC);
OrderedNode *N = GetRFLAG(FEXCore::X86State::RFLAG_SF_RAW_LOC);
SetRFLAG<FEXCore::X86State::X87FLAG_C0_LOC>(_Or(OpSize::i32Bit, N, V));
SetRFLAG<FEXCore::X86State::X87FLAG_C3_LOC>(_Or(OpSize::i32Bit, Z, V));
}
SetRFLAG<FEXCore::X86State::X87FLAG_C1_LOC>(_Constant(0));
SetRFLAG<FEXCore::X86State::X87FLAG_C2_LOC>(V);
SetRFLAG<FEXCore::X86State::X87FLAG_C3_LOC>(_Or(OpSize::i32Bit, Z, V));
}
// Helper to derive Dest by a given builder-using Expression with the opcode