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MMU: disable BAT resolution

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No known games, not even Wii MMU games like Cars 2 and Toy Story 3, use custom
BATs. This makes BAT resolution a waste of time. BAT handling could be
optimized significantly, but as long as nothing uses it, it's easier to just
disable it.

Should significantly improve performance in MMU-heavy games.
This commit is contained in:
Fiora 2014-10-13 19:33:46 -07:00
parent 89fb096ef3
commit 6ac2fcca61
1 changed files with 7 additions and 15 deletions
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22
Source/Core/Core/HW/MemmapFunctions.cpp
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@ -967,20 +967,12 @@ u32 TranslateAddress(const u32 _Address, const XCheckTLBFlag _Flag)
// Check MSR[DR] bit before translating data addresses // Check MSR[DR] bit before translating data addresses
//if (((_Flag == FLAG_READ) || (_Flag == FLAG_WRITE)) && !(MSR & (1 << (31 - 27)))) return _Address; //if (((_Flag == FLAG_READ) || (_Flag == FLAG_WRITE)) && !(MSR & (1 << (31 - 27)))) return _Address;
u32 tlb_addr = TranslateBlockAddress(_Address, _Flag); // Technically we should do this, but no known games, even heavy MMU ones, use any custom BATs whatsoever,
if (tlb_addr == 0) // so it's a waste of time and should never succeed (given the default BATs are already handled in
{ // ReadFromHardware/WriteToHardware).
tlb_addr = TranslatePageAddress(_Address, _Flag); //u32 tlb_addr = TranslateBlockAddress(_Address, _Flag);
if (tlb_addr != 0) //if (!tlb_addr)
{ // return tlb_addr;
return tlb_addr; return TranslatePageAddress(_Address, _Flag);
}
}
else
{
return tlb_addr;
}
return 0;
} }
} // namespace } // namespace