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OpcodeDispatcher: Minor division improvement

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No need to extract the subregisters out before operating on them since
the long division and long remainder IR operations correctly zero/sign
extend the incoming sources as necessary. Saves a couple of
instructions.
This commit is contained in:
Ryan Houdek committed 2024-12-20 13:20:52 -08:00
1 parent 1e827ec7a6
commit bb10f25808
1 file changed
+9 -9
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+9 -9
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@@ -3613,16 +3613,16 @@ void OpDispatchBuilder::DIVOp(OpcodeArgs) {
auto ResultAX = _Bfi(GPRSize, 8, 8, UDivOp, URemOp);
StoreGPRRegister(X86State::REG_RAX, ResultAX, OpSize::i16Bit);
} else if (Size == OpSize::i16Bit) {
Ref Src1 = LoadGPRRegister(X86State::REG_RAX, Size);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX, Size);
Ref Src1 = LoadGPRRegister(X86State::REG_RAX);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX);
auto UDivOp = _LUDiv(OpSize::i16Bit, Src1, Src2, Divisor);
auto URemOp = _LURem(OpSize::i16Bit, Src1, Src2, Divisor);
StoreGPRRegister(X86State::REG_RAX, UDivOp, Size);
StoreGPRRegister(X86State::REG_RDX, URemOp, Size);
} else if (Size == OpSize::i32Bit) {
Ref Src1 = LoadGPRRegister(X86State::REG_RAX, Size);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX, Size);
Ref Src1 = LoadGPRRegister(X86State::REG_RAX);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX);
Ref UDivOp = _Bfe(OpSize::i32Bit, IR::OpSizeAsBits(Size), 0, _LUDiv(OpSize::i32Bit, Src1, Src2, Divisor));
Ref URemOp = _Bfe(OpSize::i32Bit, IR::OpSizeAsBits(Size), 0, _LURem(OpSize::i32Bit, Src1, Src2, Divisor));
@@ -3654,7 +3654,7 @@ void OpDispatchBuilder::IDIVOp(OpcodeArgs) {
const auto Size = OpSizeFromSrc(Op);
if (Size == OpSize::i8Bit) {
Ref Src1 = LoadGPRRegister(X86State::REG_RAX, OpSize::i16Bit);
Ref Src1 = LoadGPRRegister(X86State::REG_RAX);
Src1 = _Sbfe(OpSize::i64Bit, 16, 0, Src1);
Divisor = _Sbfe(OpSize::i64Bit, 8, 0, Divisor);
@@ -3665,16 +3665,16 @@ void OpDispatchBuilder::IDIVOp(OpcodeArgs) {
auto ResultAX = _Bfi(GPRSize, 8, 8, UDivOp, URemOp);
StoreGPRRegister(X86State::REG_RAX, ResultAX, OpSize::i16Bit);
} else if (Size == OpSize::i16Bit) {
Ref Src1 = LoadGPRRegister(X86State::REG_RAX, Size);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX, Size);
Ref Src1 = LoadGPRRegister(X86State::REG_RAX);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX);
auto UDivOp = _LDiv(OpSize::i16Bit, Src1, Src2, Divisor);
auto URemOp = _LRem(OpSize::i16Bit, Src1, Src2, Divisor);
StoreGPRRegister(X86State::REG_RAX, UDivOp, Size);
StoreGPRRegister(X86State::REG_RDX, URemOp, Size);
} else if (Size == OpSize::i32Bit) {
Ref Src1 = LoadGPRRegister(X86State::REG_RAX, Size);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX, Size);
Ref Src1 = LoadGPRRegister(X86State::REG_RAX);
Ref Src2 = LoadGPRRegister(X86State::REG_RDX);
Ref UDivOp = _Bfe(OpSize::i32Bit, IR::OpSizeAsBits(Size), 0, _LDiv(OpSize::i32Bit, Src1, Src2, Divisor));
Ref URemOp = _Bfe(OpSize::i32Bit, IR::OpSizeAsBits(Size), 0, _LRem(OpSize::i32Bit, Src1, Src2, Divisor));