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X87F64: Use Bfe for rounding mode, FCHS use float instruction

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This commit is contained in:
CallumDev 2023-10-01 11:11:33 +10:30
parent ab4642af38
commit c09c25005e
1 changed files with 7 additions and 13 deletions
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20
FEXCore/Source/Interface/Core/OpcodeDispatcher/X87F64.cpp
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@ -72,11 +72,7 @@ void OpDispatchBuilder::X87LDENVF64(OpcodeArgs) {
auto NewFCW = _LoadMem(GPRClass, 2, Mem, 2);
//ignore the rounding precision, we're always 64-bit in F64.
//extract rounding mode
OrderedNode *roundingMode = NewFCW;
auto roundShift = _Constant(10);
auto roundMask = _Constant(3);
roundingMode = _Lshr(OpSize::i32Bit, roundingMode, roundShift);
roundingMode = _And(OpSize::i32Bit, roundingMode, roundMask);
OrderedNode *roundingMode = _Bfe(OpSize::i32Bit, 3, 10, NewFCW);
_SetRoundingMode(roundingMode);
_StoreContext(2, GPRClass, NewFCW, offsetof(FEXCore::Core::CPUState, FCW));
@ -96,11 +92,11 @@ void OpDispatchBuilder::X87FLDCWF64(OpcodeArgs) {
OrderedNode *NewFCW = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, -1);
//ignore the rounding precision, we're always 64-bit in F64.
//extract rounding mode
OrderedNode *roundingMode = NewFCW;
auto shift = _Constant(10);
auto mask = _Constant(3);
roundingMode = _Lshr(OpSize::i32Bit, roundingMode, shift);
roundingMode = _And(OpSize::i32Bit, roundingMode, mask);
OrderedNode *roundingMode = _Bfe(OpSize::i32Bit, 3, 10, NewFCW);
//auto shift = _Constant(10);
//auto mask = _Constant(3);
//roundingMode = _Lshr(OpSize::i32Bit, roundingMode, shift);
//roundingMode = _And(OpSize::i32Bit, roundingMode, mask);
_SetRoundingMode(roundingMode);
_StoreContext(2, GPRClass, NewFCW, offsetof(FEXCore::Core::CPUState, FCW));
}
@ -589,9 +585,7 @@ void OpDispatchBuilder::FSUBF64<32, true, true, OpDispatchBuilder::OpResult::RES
void OpDispatchBuilder::FCHSF64(OpcodeArgs) {
auto top = GetX87Top();
auto a = _LoadContextIndexed(top, 8, MMBaseOffset(), 16, FPRClass);
auto b = _VCastFromGPR(8, 8, _Constant(0x8000000000000000));
auto result = _VXor(8, 8, a, b);
auto result = _VFNeg(8, 8, a);
// Write to ST[TOP]
_StoreContextIndexed(result, top, 8, MMBaseOffset(), 16, FPRClass);
}