Only try to clean up the current block if we changed that block already.
llvm-svn: 112625
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@ -100,19 +100,25 @@ bool CorrelatedValuePropagation::processPHI(PHINode *P) {
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bool CorrelatedValuePropagation::runOnFunction(Function &F) {
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LVI = &getAnalysis<LazyValueInfo>();
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bool Changed = false;
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bool FnChanged = false;
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for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI) {
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bool BBChanged = false;
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for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE; ) {
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Instruction *II = BI++;
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if (SelectInst *SI = dyn_cast<SelectInst>(II))
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Changed |= processSelect(SI);
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BBChanged |= processSelect(SI);
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else if (PHINode *P = dyn_cast<PHINode>(II))
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Changed |= processPHI(P);
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BBChanged |= processPHI(P);
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}
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SimplifyInstructionsInBlock(FI);
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// Propagating correlated values might leave cruft around.
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// Try to clean it up before we continue.
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if (BBChanged)
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SimplifyInstructionsInBlock(FI);
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FnChanged |= BBChanged;
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}
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return Changed;
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return FnChanged;
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}
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