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Use X instead of A when lda/sta sequence inside TAXA range

This commit is contained in:
drmortalwombat 2023-01-08 10:56:14 +01:00
parent 10359224d4
commit 50d3c843b4
1 changed files with 22 additions and 0 deletions
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22
oscar64/NativeCodeGenerator.cpp
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@ -18048,6 +18048,28 @@ bool NativeCodeBasicBlock::JoinTAXARange(int from, int to)
} }
} }
int i = from + 1;
while (i < to && (mIns[i].mType == ASMIT_LDA || mIns[i].mType == ASMIT_STA) && (mIns[i].mMode == ASMIM_IMMEDIATE || mIns[i].mMode == ASMIM_ABSOLUTE || mIns[i].mMode == ASMIM_ZERO_PAGE))
i++;
if (i == to)
{
for (int i = from + 1; i < to; i++)
{
if (mIns[i].mType == ASMIT_LDA)
mIns[i].mType = ASMIT_LDX;
else if (mIns[i].mType == ASMIT_STA)
mIns[i].mType = ASMIT_STX;
mIns[i].mLive |= LIVE_CPU_REG_X;
}
mIns[from].mType = ASMIT_NOP; mIns[from].mMode = ASMIM_IMPLIED;
mIns[to].mType = ASMIT_NOP; mIns[to].mMode = ASMIM_IMPLIED;
CheckLive();
return true;
}
if (to + 1 < mIns.Size() && mIns[to + 1].mType == ASMIT_STA && !(mIns[to + 1].mLive & LIVE_CPU_REG_A)) if (to + 1 < mIns.Size() && mIns[to + 1].mType == ASMIT_STA && !(mIns[to + 1].mLive & LIVE_CPU_REG_A))
{ {
NativeCodeInstruction ins(mIns[to + 1]); NativeCodeInstruction ins(mIns[to + 1]);