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Improve redundant loop counter removal

This commit is contained in:
drmortalwombat 2024-09-23 17:53:12 +02:00
parent 49893f6976
commit 21b5e75ddb
1 changed files with 8 additions and 3 deletions
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11
oscar64/InterCode.cpp
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@ -16016,7 +16016,8 @@ void InterCodeBasicBlock::EliminateDoubleLoopCounter(void)
if (ci->mOperator == IA_CMPEQ && eblock->mFalseJump == this || if (ci->mOperator == IA_CMPEQ && eblock->mFalseJump == this ||
ci->mOperator == IA_CMPNE && eblock->mTrueJump == this || ci->mOperator == IA_CMPNE && eblock->mTrueJump == this ||
ci->mOperator == IA_CMPGU && eblock->mTrueJump == this && ci->mSrc[0].mTemp < 0 && ci->mSrc[0].mIntConst == 0) ci->mOperator == IA_CMPGU && eblock->mTrueJump == this && ci->mSrc[0].mTemp < 0 && ci->mSrc[0].mIntConst == 0 ||
ci->mOperator == IA_CMPLEU && eblock->mTrueJump == this && ci->mSrc[0].mTemp < 0)
{ {
if (ci->mSrc[0].mTemp < 0) if (ci->mSrc[0].mTemp < 0)
lc.mEnd = ci->mSrc[0].mIntConst; lc.mEnd = ci->mSrc[0].mIntConst;
@ -16077,6 +16078,9 @@ void InterCodeBasicBlock::EliminateDoubleLoopCounter(void)
int64 end = lcs[k].mEnd; int64 end = lcs[k].mEnd;
int64 step = lcs[k].mStep; int64 step = lcs[k].mStep;
if (lcs[k].mCmp->mOperator == IA_CMPLEU)
end += step;
if (step > 0 && end > start || step < 0 && end < start) if (step > 0 && end > start || step < 0 && end < start)
loop = (end - start) / step; loop = (end - start) / step;
} }
@ -16110,7 +16114,7 @@ void InterCodeBasicBlock::EliminateDoubleLoopCounter(void)
lcs[k].mCmp->mSrc[ti] = lcs[j].mInc->mDst; lcs[k].mCmp->mSrc[ti] = lcs[j].mInc->mDst;
lcs[k].mCmp->mSrc[ci] = lcs[j].mInit->mConst; lcs[k].mCmp->mSrc[ci] = lcs[j].mInit->mConst;
lcs[k].mCmp->mSrc[ci].mIntConst += loop * lcs[j].mStep; lcs[k].mCmp->mSrc[ci].mIntConst += loop * lcs[j].mStep;
if (lcs[k].mCmp->mOperator == IA_CMPGU) if (lcs[k].mCmp->mOperator == IA_CMPGU || lcs[k].mCmp->mOperator == IA_CMPLEU)
lcs[k].mCmp->mOperator = IA_CMPNE; lcs[k].mCmp->mOperator = IA_CMPNE;
InterInstruction* iins = lcs[k].mInit->Clone(); InterInstruction* iins = lcs[k].mInit->Clone();
@ -22450,7 +22454,7 @@ void InterCodeProcedure::Close(void)
{ {
GrowingTypeArray tstack(IT_NONE); GrowingTypeArray tstack(IT_NONE);
CheckFunc = !strcmp(mIdent->mString, "bad"); CheckFunc = !strcmp(mIdent->mString, "main");
CheckCase = false; CheckCase = false;
mEntryBlock = mBlocks[0]; mEntryBlock = mBlocks[0];
@ -23362,6 +23366,7 @@ void InterCodeProcedure::Close(void)
TempForwarding(false, true); TempForwarding(false, true);
EliminateDoubleLoopCounter(); EliminateDoubleLoopCounter();
DisassembleDebug("EliminateDoubleLoopCounter");
ResetVisited(); ResetVisited();
mEntryBlock->SingleLoopCountZeroCheck(); mEntryBlock->SingleLoopCountZeroCheck();