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a few attempts at optimization

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This commit is contained in:
StapleButter
2017-04-23 15:25:15 +02:00
parent 60cdc7d6f7
commit 1759672d14
6 changed files with 109 additions and 42 deletions
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17
src/DMA.cpp
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@ -233,6 +233,23 @@ s32 DMA::Run(s32 cycles)
}
else
{
// optimized path for typical GXFIFO DMA
if (CPU == 0 && (CurSrcAddr>>24) == 0x02 && CurDstAddr == 0x04000400 && DstAddrInc == 0)
{
while (IterCount > 0 && cycles > 0)
{
GPU3D::WriteToGXFIFO(*(u32*)&NDS::MainRAM[CurSrcAddr&0x3FFFFF]);
s32 c = (Waitstates[1][0x2] + Waitstates[1][0x4]);
cycles -= c;
NDS::RunTimingCriticalDevices(0, c);
CurSrcAddr += SrcAddrInc<<2;
IterCount--;
RemCount--;
}
}
u32 (*readfn)(u32) = CPU ? NDS::ARM7Read32 : NDS::ARM9Read32;
void (*writefn)(u32,u32) = CPU ? NDS::ARM7Write32 : NDS::ARM9Write32;