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Detangle XY abs load/store pairs

This commit is contained in:
drmortalwombat 2024-10-22 17:17:29 +02:00
parent 7e0ff7449c
commit 5946f17632
1 changed files with 12 additions and 0 deletions
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12
oscar64/NativeCodeGenerator.cpp
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@ -47303,6 +47303,18 @@ bool NativeCodeBasicBlock::PeepHoleOptimizerIterate4(int i, int pass)
return true;
}
if (mIns[i + 0].mType == ASMIT_LDX && mIns[i + 0].mMode == ASMIM_ABSOLUTE_Y &&
mIns[i + 1].mType == ASMIT_TAY &&
mIns[i + 2].mType == ASMIT_TXA &&
mIns[i + 3].mType == ASMIT_STA && mIns[i + 3].mMode == ASMIM_ABSOLUTE_Y && !(mIns[i + 3].mLive & (LIVE_CPU_REG_X | LIVE_CPU_REG_Y)))
{
mIns[i + 2] = mIns[i + 0]; mIns[i + 2].mType = ASMIT_LDA; mIns[i + 2].mLive |= LIVE_CPU_REG_A | LIVE_CPU_REG_X;
mIns[i + 1].mType = ASMIT_TAX;
mIns[i + 3].mMode = ASMIM_ABSOLUTE_X;
mIns[i + 0].mType = ASMIT_NOP; mIns[i + 0].mMode = ASMIM_IMPLIED;
return true;
}
if (mIns[i + 0].mType == ASMIT_LDY && mIns[i + 2].mType == ASMIT_LDX && mIns[i + 0].SameEffectiveAddress(mIns[i + 2]) &&
!mIns[i + 0].MayBeChangedOnAddress(mIns[i + 1]) && !mIns[i + 1].ChangesYReg() &&
mIns[i + 1].mMode == ASMIM_ABSOLUTE_Y && mIns[i + 3].mMode == ASMIM_ABSOLUTE_X && !(mIns[i + 2].mLive & LIVE_CPU_REG_Z))