steam-frame/FEX-Emu--FEX
1
0 Fork 0
mirror of https://github.com/FEX-Emu/FEX.git synced 2026-10-06 14:00:16 +02:00
Code Issues Packages Projects Releases 66 Wiki Activity

OpcodeDispatcher: Optimize reconstructing FSW

Browse Source 
Minor optimization using Bfi to insert C0, C1, C2, & C3
This commit is contained in:
Ryan Houdek committed 2023-09-21 02:07:27 -07:00
1 parent 67680d71a4
commit 5664195e49
1 file changed
+5 -6
Download Patch File Download Diff File Expand all files Collapse all files
FEXCore/Source/Interface/Core/OpcodeDispatcher/X87.cpp
+5 -6
View File
@@ -91,20 +91,19 @@ void OpDispatchBuilder::SetX87Top(OrderedNode *Value) {
OrderedNode *OpDispatchBuilder::ReconstructFSW() {
// We must construct the FSW from our various bits
// TODO: These should use BFI
OrderedNode *FSW = _Constant(0);
auto Top = GetX87Top();
FSW = _Or(OpSize::i64Bit, FSW, _Lshl(OpSize::i32Bit, Top, _Constant(11)));
FSW = _Bfi(OpSize::i64Bit, 3, 11, FSW, Top);
auto C0 = GetRFLAG(FEXCore::X86State::X87FLAG_C0_LOC);
auto C1 = GetRFLAG(FEXCore::X86State::X87FLAG_C1_LOC);
auto C2 = GetRFLAG(FEXCore::X86State::X87FLAG_C2_LOC);
auto C3 = GetRFLAG(FEXCore::X86State::X87FLAG_C3_LOC);
FSW = _Or(OpSize::i64Bit, FSW, _Lshl(OpSize::i32Bit, C0, _Constant(8)));
FSW = _Or(OpSize::i64Bit, FSW, _Lshl(OpSize::i32Bit, C1, _Constant(9)));
FSW = _Or(OpSize::i64Bit, FSW, _Lshl(OpSize::i32Bit, C2, _Constant(10)));
FSW = _Or(OpSize::i64Bit, FSW, _Lshl(OpSize::i32Bit, C3, _Constant(14)));
FSW = _Bfi(OpSize::i64Bit, 1, 8, FSW, C0);
FSW = _Bfi(OpSize::i64Bit, 1, 9, FSW, C1);
FSW = _Bfi(OpSize::i64Bit, 1, 10, FSW, C2);
FSW = _Bfi(OpSize::i64Bit, 1, 14, FSW, C3);
return FSW;
}