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Loop optimizing index register usage

This commit is contained in:
drmortalwombat 2022-03-10 22:18:09 +01:00
parent 6fe9a4f167
commit 6f52a7beed
1 changed files with 44 additions and 0 deletions
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44
oscar64/NativeCodeGenerator.cpp
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@ -9402,6 +9402,21 @@ bool NativeCodeBasicBlock::ForwardZpYIndex(void)
{
yreg = -1;
}
else if (mIns[i].mType == ASMIT_STY && mIns[i].mMode == ASMIM_ZERO_PAGE && mIns[i].mAddress == yreg)
{
yoffset = 0;
ypred = i;
}
#if 1
else if (mIns[i].mType == ASMIT_INC && mIns[i].mMode == ASMIM_ZERO_PAGE && mIns[i].mAddress == yreg && yoffset == 0 && mIns[ypred].mType == ASMIT_STY && !(mIns[i].mLive & LIVE_CPU_REG_Y))
{
for (int j = ypred; j < i; j++)
mIns[j].mLive |= LIVE_CPU_REG_Y;
mIns[i].mType = ASMIT_STY;
mIns.Insert(i, NativeCodeInstruction(ASMIT_INY));
ypred = i + 1;
}
#endif
else if (yreg >= 0 && mIns[i].ChangesZeroPage(yreg))
{
yreg = -1;
@ -12668,6 +12683,21 @@ bool NativeCodeBasicBlock::OptimizeSimpleLoopInvariant(NativeCodeProcedure* proc
}
}
}
if (si < ei && mIns[ei].mType == ASMIT_STY && mIns[ei].mMode == ASMIM_ZERO_PAGE)
{
int j = 0;
while (j < mIns.Size() && (j == ei || !(mIns[j].ChangesZeroPage(mIns[ei].mAddress) || mIns[j].UsesZeroPage(mIns[ei].mAddress))))
j++;
if (j == mIns.Size())
{
if (!prevBlock)
return OptimizeSimpleLoopInvariant(proc);
exitBlock->mIns.Insert(0, mIns[ei]);
mIns.Remove(ei);
return true;
}
}
si = 0;
ei = mIns.Size() - 1;
@ -12714,6 +12744,20 @@ bool NativeCodeBasicBlock::OptimizeSimpleLoopInvariant(NativeCodeProcedure* proc
}
}
if (si < ei && mIns[ei].mType == ASMIT_STX && mIns[ei].mMode == ASMIM_ZERO_PAGE)
{
int j = 0;
while (j < mIns.Size() && (j == ei || !(mIns[j].ChangesZeroPage(mIns[ei].mAddress) || mIns[j].UsesZeroPage(mIns[ei].mAddress))))
j++;
if (j == mIns.Size())
{
if (!prevBlock)
return OptimizeSimpleLoopInvariant(proc);
exitBlock->mIns.Insert(0, mIns[ei]);
mIns.Remove(ei);
return true;
}
}
if (sz >= 2 && mIns[0].mType == ASMIT_LDY && mIns[0].mMode == ASMIM_ZERO_PAGE)
{