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Fold CLC into prev block for dual pointer increment

This commit is contained in:
drmortalwombat 2025-06-19 09:37:03 +02:00
parent f1873f0794
commit fd7e68573c
1 changed files with 37 additions and 0 deletions
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37
oscar64/NativeCodeGenerator.cpp
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@ -45423,6 +45423,43 @@ void NativeCodeBasicBlock::BlockSizeReduction(NativeCodeProcedure* proc, int xen
}
#endif
// Check for small condition block
if (mFalseJump)
{
NativeCodeBasicBlock* cblock = nullptr, * eblock = nullptr;
if (mTrueJump == mFalseJump->mTrueJump && !mFalseJump->mFalseJump && mTrueJump->mNumEntries == 2 && mFalseJump->mNumEntries == 1)
{
cblock = mFalseJump;
eblock = mTrueJump;
}
else if (mFalseJump == mTrueJump->mTrueJump && !mTrueJump->mFalseJump && mFalseJump->mNumEntries == 2 && mTrueJump->mNumEntries == 1)
{
cblock = mTrueJump;
eblock = mFalseJump;
}
if (eblock && cblock->mIns.Size() == 1 && cblock->mIns[0].mType == ASMIT_INC)
{
int i = 0;
while (i < eblock->mIns.Size() && !eblock->mIns[i].ReferencesCarry())
i++;
if (i < eblock->mIns.Size() && eblock->mIns[i].mType == ASMIT_CLC)
{
if (mBranch == ASMIT_BCC && eblock == mTrueJump || mBranch == ASMIT_BCS && eblock == mFalseJump)
{
cblock->mIns.Push(NativeCodeInstruction(eblock->mIns[i].mIns, ASMIT_CLC));
eblock->mIns.Remove(i);
mExitRequiredRegs += CPU_REG_C;
cblock->mExitRequiredRegs += CPU_REG_C;
eblock->mEntryRequiredRegs += CPU_REG_C;
for (int j = 0; j < i; j++)
eblock->mIns[j].mLive |= LIVE_CPU_REG_C;
}
}
}
}
bool carrySet = false, carryClear = false;
if (mEntryBlocks.Size() == 1 && center >= 0)
{