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OpcodeDispatcher: Fix RestoreX87State to rotate MM regs by Top of Stack

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Simon Scherer authored and Ryan Houdek committed 2026-09-15 16:38:36 -07:00
1 parent 2790f89949
commit 93def42061
1 file changed
+17 -5
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FEXCore/Source/Interface/Core/OpcodeDispatcher/Vector.cpp
+17 -5
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@@ -3249,9 +3249,10 @@ void OpDispatchBuilder::RestoreX87State(Ref MemBase) {
auto NewFCW = _LoadMemGPR(OpSize::i16Bit, MemBase, OpSize::i16Bit);
_StoreContextGPR(OpSize::i16Bit, NewFCW, offsetof(FEXCore::Core::CPUState, FCW));
Ref Top {};
{
auto NewFSW = _LoadMemGPR(OpSize::i16Bit, MemBase, Constant(2), OpSize::i16Bit, MemOffsetType::SXTX, 1);
ReconstructX87StateFromFSW_Helper(NewFSW);
Top = ReconstructX87StateFromFSW_Helper(NewFSW);
}
{
@@ -3260,10 +3261,21 @@ void OpDispatchBuilder::RestoreX87State(Ref MemBase) {
_StoreContextGPR(OpSize::i8Bit, NewFTW, offsetof(FEXCore::Core::CPUState, AbridgedFTW));
}
for (uint32_t i = 0; i < Core::CPUState::NUM_MMS; i += 2) {
auto MMRegs = LoadMemPairFPR(OpSize::i128Bit, MemBase, i * 16 + 32);
_StoreContextFPR(OpSize::i128Bit, MMRegs.Low, MMBaseOffset() + i * 16);
_StoreContextFPR(OpSize::i128Bit, MMRegs.High, MMBaseOffset() + (i + 1) * 16);
auto SevenConst = Constant(7);
auto low = Constant(~0ULL);
auto high = Constant(0xFFFF);
Ref Mask = _VLoadTwoGPRs(low, high);
const auto StoreSize = ReducedPrecisionMode ? OpSize::i64Bit : OpSize::i128Bit;
for (uint32_t i = 0; i < Core::CPUState::NUM_MMS; ++i) {
Ref Reg = _LoadMemFPR(OpSize::i128Bit, MemBase, Constant(16 * i + 32), OpSize::i8Bit, MemOffsetType::SXTX, 1);
// Mask off the top bits
Reg = _VAnd(OpSize::i128Bit, Reg, Mask);
if (ReducedPrecisionMode) {
// Convert to double precision
Reg = _F80CVT(OpSize::i64Bit, Reg);
}
_StoreContextFPRIndexed(Reg, Top, StoreSize, MMBaseOffset(), IR::OpSizeToSize(OpSize::i128Bit));
Top = _And(OpSize::i32Bit, Add(OpSize::i32Bit, Top, 1), SevenConst);
}
}