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Optimize absolute array addressing

This commit is contained in:
drmortalwombat 2021-12-03 22:49:14 +01:00
parent e4d24f1aa4
commit 973e13b776
1 changed files with 56 additions and 2 deletions
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54
oscar64/NativeCodeGenerator.cpp
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@ -8108,6 +8108,41 @@ bool NativeCodeBasicBlock::FindGlobalAddressSumY(int at, int reg, bool direct, i
k++;
}
return flags != 0;
}
else if (
mIns[j + 1].mType == ASMIT_CLC &&
mIns[j + 2].mType == ASMIT_ADC && mIns[j + 2].mMode == ASMIM_IMMEDIATE &&
mIns[j + 3].mType == ASMIT_STA && mIns[j + 3].mMode == ASMIM_ZERO_PAGE && mIns[j + 3].mAddress == reg &&
mIns[j + 4].mType == ASMIT_LDA && mIns[j + 4].mMode == ASMIM_IMMEDIATE &&
mIns[j + 5].mType == ASMIT_ADC && mIns[j + 5].mMode == ASMIM_IMMEDIATE &&
mIns[j + 6].mType == ASMIT_STA && mIns[j + 6].mMode == ASMIM_ZERO_PAGE && mIns[j + 6].mAddress == reg + 1)
{
ains = &(mIns[j + 2]);
iins = nullptr;
apos = j + 1;
if (!direct)
return false;
flags = (LIVE_CPU_REG_X | LIVE_CPU_REG_Y) & ~mIns[j + 1].mLive;
if (mIns[j + 0].mType == ASMIT_TAX)
flags |= LIVE_CPU_REG_X;
if (mIns[j + 0].mType == ASMIT_TAY)
flags |= LIVE_CPU_REG_Y;
int k = j + 7;
while (k < at)
{
assert(!(flags & LIVE_CPU_REG_Y) || mIns[k].mType != ASMIT_TYA);
if (mIns[k].ChangesYReg())
flags &= ~LIVE_CPU_REG_Y;
if (mIns[k].ChangesXReg())
flags &= ~LIVE_CPU_REG_X;
k++;
}
return flags != 0;
}
#endif
@ -10360,8 +10395,17 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(int pass)
{
mIns[i + 1].mMode = ASMIM_ABSOLUTE_X;
}
if (ains->mMode == ASMIM_IMMEDIATE)
{
mIns[i + 1].mLinkerObject = 0;
mIns[i + 1].mAddress = ains[0].mAddress + 256 * (ains[2].mAddress + ains[3].mAddress);
}
else
{
mIns[i + 1].mLinkerObject = ains->mLinkerObject;
mIns[i + 1].mAddress = ains->mAddress + mIns[i + 0].mAddress;
}
if (!iins)
{
@ -10722,6 +10766,16 @@ bool NativeCodeBasicBlock::PeepHoleOptimizer(int pass)
progress = true;
}
#endif
else if (
mIns[i + 0].mType == ASMIT_ADC && mIns[i + 0].mMode == ASMIM_IMMEDIATE &&
mIns[i + 1].mType == ASMIT_CLC &&
mIns[i + 2].mType == ASMIT_ADC && mIns[i + 2].mMode == ASMIM_IMMEDIATE && !(mIns[i + 2].mLive & LIVE_CPU_REG_C))
{
mIns[i + 0].mAddress += mIns[i + 2].mAddress;
mIns[i + 1].mType = ASMIT_NOP; mIns[i + 1].mMode = ASMIM_IMPLIED;
mIns[i + 2].mType = ASMIT_NOP; mIns[i + 2].mMode = ASMIM_IMPLIED;
progress = true;
}
else if (
mIns[i + 0].mType == ASMIT_STA &&
mIns[i + 2].mType == ASMIT_STA && mIns[i + 0].SameEffectiveAddress(mIns[i + 2]) &&