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DMA: Batch multi-word transfers together

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This commit is contained in:
Connor McLaughlin
2019-10-13 16:48:11 +10:00
parent 88ec178380
commit ec8c5d4bb6
12 changed files with 273 additions and 149 deletions
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42
src/core/spu.cpp
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@ -412,18 +412,44 @@ void SPU::WriteVoiceRegister(u32 offset, u16 value)
}
}
u32 SPU::DMARead()
void SPU::DMARead(u32* words, u32 word_count)
{
const u16 lsb = RAMTransferRead();
const u16 msb = RAMTransferRead();
return ZeroExtend32(lsb) | (ZeroExtend32(msb) << 16);
// test for wrap-around
if ((m_transfer_address & ~RAM_MASK) != ((m_transfer_address + (word_count * sizeof(u32))) & ~RAM_MASK))
{
// this could still be optimized to copy in two parts - end/start, but is unlikely.
for (u32 i = 0; i < word_count; i++)
{
const u16 lsb = RAMTransferRead();
const u16 msb = RAMTransferRead();
words[i] = ZeroExtend32(lsb) | (ZeroExtend32(msb) << 16);
}
}
else
{
std::memcpy(words, &m_ram[m_transfer_address], sizeof(u32) * word_count);
m_transfer_address = (m_transfer_address + (sizeof(u32) * word_count)) & RAM_MASK;
}
}
void SPU::DMAWrite(u32 value)
void SPU::DMAWrite(const u32* words, u32 word_count)
{
// two 16-bit writes to prevent out-of-bounds
RAMTransferWrite(Truncate16(value));
RAMTransferWrite(Truncate16(value >> 16));
// test for wrap-around
if ((m_transfer_address & ~RAM_MASK) != ((m_transfer_address + (word_count * sizeof(u32))) & ~RAM_MASK))
{
// this could still be optimized to copy in two parts - end/start, but is unlikely.
for (u32 i = 0; i < word_count; i++)
{
const u32 value = words[i];
RAMTransferWrite(Truncate16(value));
RAMTransferWrite(Truncate16(value >> 16));
}
}
else
{
std::memcpy(&m_ram[m_transfer_address], words, sizeof(u32) * word_count);
m_transfer_address = (m_transfer_address + (sizeof(u32) * word_count)) & RAM_MASK;
}
}
void SPU::UpdateDMARequest()