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Implements explicit state switch between X87 and MMX

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Fixes #3850
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Paulo Matos committed 2024-10-15 17:58:53 +02:00
1 parent ddd7a550e4
commit 0d53f2b45c
5 files changed
+43 -11
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+7 -3
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@@ -4407,9 +4407,13 @@ void OpDispatchBuilder::StoreResult_WithOpSize(FEXCore::IR::RegisterClassType Cl
LOGMAN_THROW_A_FMT(OpSize == 8, "full");
LOGMAN_THROW_A_FMT(Class == FPRClass, "MMX is floaty");
// Partial store into bottom 64-bits, leave the upper bits unaffected.
// XXX: We actually should set the upper bits to all-1s?
StoreContextPartial(MM0Index + gpr - FEXCore::X86State::REG_MM_0, Src);
if (MMXState != MMXState_MMX) {
ChgStateX87_MMX();
}
uint8_t Index = MM0Index + gpr - FEXCore::X86State::REG_MM_0;
StoreContext(Index, Src);
RegCache.Partial |= (1ull << (uint64_t)Index);
} else if (gpr >= FEXCore::X86State::REG_XMM_0) {
const auto gprIndex = gpr - X86State::REG_XMM_0;
const auto VectorSize = GetGuestVectorLength();