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Optimize adds to ors when possible

This commit is contained in:
drmortalwombat 2022-12-30 20:20:49 +01:00
parent 425aae8f72
commit 57449e3f4a
1 changed files with 40 additions and 2 deletions
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38
oscar64/NativeCodeGenerator.cpp
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@ -2238,6 +2238,34 @@ bool NativeCodeInstruction::BitFieldForwarding(NativeRegisterDataSet& data, AsmI
break; break;
case ASMIT_ADC: case ASMIT_ADC:
if (mMode == ASMIM_IMMEDIATE && data.mRegs[CPU_REG_C].mMask == 1 && data.mRegs[CPU_REG_C].mValue == 0)
{
if ((mAddress & ~data.mRegs[CPU_REG_A].mMask) == 0 && (mAddress & data.mRegs[CPU_REG_A].mValue) == 0)
{
mType = ASMIT_ORA;
data.mRegs[CPU_REG_A].mValue |= mAddress;
changed = true;
}
else if (mAddress == 1 && (data.mRegs[CPU_REG_A].mMask & 3) == 3 && (data.mRegs[CPU_REG_A].mValue & 3) == 1)
{
mType = ASMIT_EOR;
mAddress = 3;
data.mRegs[CPU_REG_A].mValue ^= 3;
changed = true;
}
else
{
data.mRegs[CPU_REG_C].mMask = 0;
data.mRegs[CPU_REG_A].mMask = 0;
}
}
else
{
data.mRegs[CPU_REG_C].mMask = 0;
data.mRegs[CPU_REG_A].mMask = 0;
}
break;
case ASMIT_SBC: case ASMIT_SBC:
data.mRegs[CPU_REG_C].mMask = 0; data.mRegs[CPU_REG_C].mMask = 0;
data.mRegs[CPU_REG_A].mMask = 0; data.mRegs[CPU_REG_A].mMask = 0;
@ -28069,6 +28097,16 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(NativeCodeProcedure* proc, int pass
mIns[i + 0].mType = ASMIT_NOP; mIns[i + 0].mMode = ASMIM_IMPLIED; mIns[i + 0].mType = ASMIT_NOP; mIns[i + 0].mMode = ASMIM_IMPLIED;
progress = true; progress = true;
} }
else if (
mIns[i + 0].mType == ASMIT_LSR && mIns[i + 0].mMode == ASMIM_IMPLIED &&
mIns[i + 1].mType == ASMIT_AND && mIns[i + 1].mMode == ASMIM_IMMEDIATE &&
mIns[i + 2].mType == ASMIT_ASL && mIns[i + 2].mMode == ASMIM_IMPLIED && !(mIns[i + 2].mLive & LIVE_CPU_REG_C))
{
mIns[i + 0].mType = ASMIT_NOP; mIns[i + 0].mMode = ASMIM_IMPLIED;
mIns[i + 1].mAddress = (mIns[i + 1].mAddress << 1) & 0xff;
mIns[i + 2].mType = ASMIT_NOP; mIns[i + 2].mMode = ASMIM_IMPLIED;
progress = true;
}
else if ( else if (
mIns[i + 0].mType == ASMIT_INY && mIns[i + 0].mType == ASMIT_INY &&
mIns[i + 1].mType == ASMIT_INY && mIns[i + 1].mType == ASMIT_INY &&