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Improve shift carry combine

This commit is contained in:
drmortalwombat 2025-05-06 18:38:44 +02:00
parent 983064c694
commit e82ab0c7ca
1 changed files with 56 additions and 2 deletions
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58
oscar64/NativeCodeGenerator.cpp
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@ -3019,8 +3019,17 @@ bool NativeCodeInstruction::BitFieldForwarding(NativeRegisterDataSet& data, AsmI
case ASMIT_LDA:
if (mMode == ASMIM_IMMEDIATE)
{
data.mRegs[CPU_REG_A].mMask = 0xff;
data.mRegs[CPU_REG_A].mValue = mAddress & 0xff;
if (data.mRegs[CPU_REG_A].mMask == 0xff && data.mRegs[CPU_REG_A].mValue == mAddress && !(mLive & LIVE_CPU_REG_Z))
{
mType = ASMIT_NOP;
mMode = ASMIM_IMPLIED;
changed = true;
}
else
{
data.mRegs[CPU_REG_A].mMask = 0xff;
data.mRegs[CPU_REG_A].mValue = mAddress & 0xff;
}
}
else
{
@ -36940,6 +36949,12 @@ bool NativeCodeBasicBlock::BitFieldForwarding(const NativeRegisterDataSet& data)
mNDataSet.mRegs[lins.mAddress].mMask = 0xff;
mNDataSet.mRegs[lins.mAddress].mValue = 0x00;
}
if (mFDataSet.mRegs[CPU_REG_A].mMask == 0xfe)
{
mFDataSet.mRegs[CPU_REG_A].mMask = 0xff;
mFDataSet.mRegs[CPU_REG_A].mValue = 0x01;
}
}
break;
case ASMIT_BNE:
@ -36969,6 +36984,12 @@ bool NativeCodeBasicBlock::BitFieldForwarding(const NativeRegisterDataSet& data)
mFDataSet.mRegs[lins.mAddress].mMask = 0xff;
mFDataSet.mRegs[lins.mAddress].mValue = 0x00;
}
if (mNDataSet.mRegs[CPU_REG_A].mMask == 0xfe)
{
mNDataSet.mRegs[CPU_REG_A].mMask = 0xff;
mNDataSet.mRegs[CPU_REG_A].mValue = 0x01;
}
}
break;
case ASMIT_BPL:
@ -45191,6 +45212,39 @@ bool NativeCodeBasicBlock::PeepHoleOptimizerShuffle(int pass)
CheckLive();
#endif
// Combine and shift
for (int i = 1; i + 2 < mIns.Size(); i++)
{
if (mIns[i + 0].mType == ASMIT_AND && mIns[i + 0].mMode == ASMIM_IMMEDIATE && mIns[i + 0].mAddress == 0x01 &&
mIns[i + 1].mType == ASMIT_ORA && mIns[i + 1].mMode == ASMIM_ZERO_PAGE &&
mIns[i + 2].mType == ASMIT_STA && mIns[i + 2].mMode == ASMIM_ZERO_PAGE && mIns[i + 1].mAddress == mIns[i + 2].mAddress &&
!(mIns[i + 2].mLive & LIVE_CPU_REG_C))
{
int j = i - 1;
while (j >= 0 && !mIns[j].ReferencesZeroPage(mIns[i + 1].mAddress))
j--;
if (j >= 0 && mIns[j].IsShift() && !(mIns[j].mLive & LIVE_CPU_REG_C))
{
if (mIns[j].mType == ASMIT_ASL)
{
mIns[i + 0].mType = ASMIT_LSR; mIns[i + 0].mMode = ASMIM_IMPLIED; mIns[i + 0].mLive |= LIVE_CPU_REG_C;
mIns[i + 1].mType = ASMIT_ROL;
mIns[i + 2].mType = ASMIT_LDA;
mIns[j + 0].mType = ASMIT_NOP; mIns[j + 0].mMode = ASMIM_IMPLIED;
changed = true;
}
else if (mIns[j].mType == ASMIT_LSR)
{
mIns[i + 0].mType = ASMIT_LSR; mIns[i + 0].mMode = ASMIM_IMPLIED; mIns[i + 0].mLive |= LIVE_CPU_REG_C;
mIns[i + 1].mType = ASMIT_ROR;
mIns[i + 2].mType = ASMIT_LDA;
mIns[j + 0].mType = ASMIT_NOP; mIns[j + 0].mMode = ASMIM_IMPLIED;
changed = true;
}
}
}
}
#if 1
for (int i = 0; i < mIns.Size(); i++)
{