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Optimize commonly executed loop in PI_DMA_WRITE

This commit is contained in:
LegendOfDragoon 2016-02-09 18:13:21 -08:00
parent ad5370a252
commit b066192abf
1 changed files with 56 additions and 2 deletions
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56
Source/Project64-core/N64System/Mips/Dma.cpp
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@ -361,10 +361,64 @@ void CDMA::PI_DMA_WRITE()
uint8_t * RDRAM = g_MMU->Rdram(); uint8_t * RDRAM = g_MMU->Rdram();
g_Reg->PI_CART_ADDR_REG -= 0x10000000; g_Reg->PI_CART_ADDR_REG -= 0x10000000;
if (g_Reg->PI_CART_ADDR_REG + PI_WR_LEN_REG < g_Rom->GetRomSize()) if (g_Reg->PI_CART_ADDR_REG + PI_WR_LEN_REG < g_Rom->GetRomSize())
{
size_t alignment;
RDRAM += g_Reg->PI_DRAM_ADDR_REG;
ROM += g_Reg->PI_CART_ADDR_REG;
alignment = PI_WR_LEN_REG | (size_t)RDRAM | (size_t)ROM;
if ((alignment & 0x3) == 0)
{
for (i = 0; i < PI_WR_LEN_REG; i += 4)
{
*(uint32_t *)(RDRAM + i) = *(uint32_t *)(ROM + i);
}
}
else if ((alignment & 1) == 0)
{
if ((PI_WR_LEN_REG & 2) == 0)
{
if (((size_t)RDRAM & 2) == 0)
{
for (i = 0; i < PI_WR_LEN_REG; i += 4)
{
*(uint16_t *)(((size_t)RDRAM + i) + 2) = *(uint16_t *)(((size_t)ROM + i) - 2);
*(uint16_t *)(((size_t)RDRAM + i) + 0) = *(uint16_t *)(((size_t)ROM + i) + 4);
}
}
else
{
if (((size_t)ROM & 2) == 0)
{
for (i = 0; i < PI_WR_LEN_REG; i += 4)
{
*(uint16_t *)(((size_t)RDRAM + i) - 2) = *(uint16_t *)(((size_t)ROM + i) + 2);
*(uint16_t *)(((size_t)RDRAM + i) + 4) = *(uint16_t *)(((size_t)ROM + i) + 0);
}
}
else
{
for (i = 0; i < PI_WR_LEN_REG; i += 4)
{
*(uint16_t *)(((size_t)RDRAM + i) - 2) = *(uint16_t *)(((size_t)ROM + i) - 2);
*(uint16_t *)(((size_t)RDRAM + i) + 4) = *(uint16_t *)(((size_t)ROM + i) + 4);
}
}
}
}
else
{
for (i = 0; i < PI_WR_LEN_REG; i += 2)
{
*(uint16_t *)(((size_t)RDRAM + i) ^ 2) = *(uint16_t *)(((size_t)ROM + i) ^ 2);
}
}
}
else
{ {
for (i = 0; i < PI_WR_LEN_REG; i++) for (i = 0; i < PI_WR_LEN_REG; i++)
{ {
*(RDRAM + ((g_Reg->PI_DRAM_ADDR_REG + i) ^ 3)) = *(ROM + ((g_Reg->PI_CART_ADDR_REG + i) ^ 3)); *(uint8_t *)(((size_t)RDRAM + i) ^ 3) = *(uint8_t *)(((size_t)ROM + i) ^ 3);
}
} }
} }
else if (g_Reg->PI_CART_ADDR_REG >= g_Rom->GetRomSize()) else if (g_Reg->PI_CART_ADDR_REG >= g_Rom->GetRomSize())