archive/Cemu
1
0
Fork 0
mirror of https://github.com/cemu-project/Cemu.git synced 2025-07-05 22:41:18 +12:00
Code Issues Projects Releases Packages Wiki Activity Actions

PPCRec: Assume only UGQR0 is reliably known

Browse source
This commit is contained in:
Exzap 2025-05-08 02:29:34 +02:00
parent 36ac5ef5a9
commit ea5ad11748
1 changed files with 9 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

19
src/Cafe/HW/Espresso/Recompiler/IML/IMLOptimizer.cpp
View file

@ -209,18 +209,17 @@ sint32 _getGQRIndexFromRegister(ppcImlGenContext_t* ppcImlGenContext, IMLReg gqr
bool PPCRecompiler_isUGQRValueKnown(ppcImlGenContext_t* ppcImlGenContext, sint32 gqrIndex, uint32& gqrValue)
{
// UGQR 2 to 7 are initialized by the OS and we assume that games won't ever permanently touch those
// todo - hack - replace with more accurate solution
// the default configuration is:
// UGQR0 = 0x00000000
// UGQR2 = 0x00040004
// UGQR3 = 0x00050005
// UGQR4 = 0x00060006
// UGQR5 = 0x00070007
// but games are free to modify UGQR2 to UGQR7 it seems.
// no game modifies UGQR0 so it's safe enough to optimize for the default value
// Ideally we would do some kind of runtime tracking and second recompilation to create fast paths for PSQ_L/PSQ_ST but thats todo
if (gqrIndex == 0)
gqrValue = 0x00000000;
else if (gqrIndex == 2)
gqrValue = 0x00040004;
else if (gqrIndex == 3)
gqrValue = 0x00050005;
else if (gqrIndex == 4)
gqrValue = 0x00060006;
else if (gqrIndex == 5)
gqrValue = 0x00070007;
else
return false;
return true;