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Reorder lda x, cmp y to reuse y

This commit is contained in:
drmortalwombat 2025-01-21 22:26:57 +01:00
parent f41d594015
commit 115129e1dd
1 changed files with 34 additions and 1 deletions
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35
oscar64/NativeCodeGenerator.cpp
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@ -25136,6 +25136,39 @@ bool NativeCodeBasicBlock::JoinTailCodeSequences(NativeCodeProcedure* proc, bool
}
}
}
#if 1
if (mTrueJump && mFalseJump && mIns.Size() >= 2 && (mBranch == ASMIT_BEQ || mBranch == ASMIT_BNE))
{
int nins = mIns.Size();
if (mIns[nins - 2].mType == ASMIT_LDA && mIns[nins - 1].mType == ASMIT_CMP && !(mIns[nins - 1].mLive & LIVE_CPU_REG_A) && !mTrueJump->mEntryRequiredRegs[CPU_REG_C] && !mFalseJump->mEntryRequiredRegs[CPU_REG_C])
{
if (mTrueJump->mIns.Size() > 0 && mTrueJump->mIns[0].mType == ASMIT_LDA && mTrueJump->mNumEntries == 1 && mTrueJump->mIns[0].SameEffectiveAddress(mIns[nins - 1]))
{
mIns[nins - 1].CopyMode(mIns[nins - 2]);
mIns[nins - 2].CopyMode(mTrueJump->mIns[0]);
mIns[nins - 1].mLive |= LIVE_CPU_REG_A;
mExitRequiredRegs += CPU_REG_A;
mTrueJump->mEntryRequiredRegs += CPU_REG_A;
mTrueJump->mIns.Remove(0);
changed = true;
CheckLive();
}
else if (mFalseJump->mIns.Size() > 0 && mFalseJump->mIns[0].mType == ASMIT_LDA && mFalseJump->mNumEntries == 1 && mFalseJump->mIns[0].SameEffectiveAddress(mIns[nins - 1]))
{
mIns[nins - 1].CopyMode(mIns[nins - 2]);
mIns[nins - 2].CopyMode(mFalseJump->mIns[0]);
mIns[nins - 1].mLive |= LIVE_CPU_REG_A;
mExitRequiredRegs += CPU_REG_A;
mFalseJump->mEntryRequiredRegs += CPU_REG_A;
mFalseJump->mIns.Remove(0);
changed = true;
CheckLive();
}
}
}
#endif
if (mTrueJump) mTrueJump->CheckLive();
if (mFalseJump) mFalseJump->CheckLive();
@ -52452,7 +52485,7 @@ void NativeCodeProcedure::Compile(InterCodeProcedure* proc)
mInterProc->mLinkerObject->mNativeProc = this;
CheckFunc = !strcmp(mIdent->mString, "rirq_sort");
CheckFunc = !strcmp(mIdent->mString, "f");
int nblocks = proc->mBlocks.Size();
tblocks = new NativeCodeBasicBlock * [nblocks];