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VU: YOLO T-Bit on MTVU 

More games than I expected just turn T-Bit on but never actually use it, which causes poor performance in MTVU due to threading.  If there is a game that uses it, we can disable MTVU in the GameDB, since it will break the performance of the game, even if we try to handle it correctly.

Maybe we can re-enable it in the future if some threading genius figures it out.
This commit is contained in:
refractionpcsx2 2022-06-25 16:32:54 +01:00
parent 7d5d2b86cf
commit 6e84e5ce9c
1 changed files with 5 additions and 4 deletions
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9
pcsx2/VU1micro.cpp
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@ -65,10 +65,11 @@ void vu1ExecMicro(u32 addr)
// Most of the time with MTVU we want to pretend the VU has finished quickly as to gain the benefit from running another thread
// however with T-Bit games when the T-Bit is enabled, it needs to wait in case a T-Bit happens, so we need to set "Busy"
// We shouldn't do this all the time as it negates the extra thread and causes games like Ratchet & Clank to be no faster.
if (VU0.VI[REG_FBRST].UL & 0x800)
{
VU0.VI[REG_VPU_STAT].UL |= 0x0100;
}
// if (VU0.VI[REG_FBRST].UL & 0x800)
// {
// VU0.VI[REG_VPU_STAT].UL |= 0x0100;
// }
// Update 25/06/2022: Disabled this for now, let games YOLO it, if it breaks MTVU, disable MTVU (it doesn't work properly anyway) - Refraction
vu1Thread.ExecuteVU(addr, vif1Regs.top, vif1Regs.itop, VU0.VI[REG_FBRST].UL);
return;