MMU: Clarify masking on gather pipe address
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@ -283,8 +283,15 @@ static void WriteToHardware(u32 em_address, const u32 data, const u32 size)
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}
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// Check for a gather pipe write.
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// Note that we must mask the address to correctly emulate certain games;
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// Pac-Man World 3 in particular is affected by this.
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//
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// Note that we must mask the address to correctly emulate certain games; Pac-Man World 3
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// in particular is affected by this. (See https://bugs.dolphin-emu.org/issues/8386)
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//
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// Note that the PowerPC 750CL manual says (in section 9.4.2 Write Gather Pipe Operation on page
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// 327): "A noncacheable store to an address with bits 0-26 matching WPAR[GB_ADDR] but with bits
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// 27-31 not all zero will result in incorrect data in the buffer." So, it's possible that in some
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// cases writes which do not exactly match the masking behave differently, but Pac-Man World 3's
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// writes happen to behave correctly.
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if (flag == XCheckTLBFlag::Write &&
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(em_address & 0xFFFFF000) == GPFifo::GATHER_PIPE_PHYSICAL_ADDRESS)
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{
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