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Only try to clean up the current block if we changed that block already.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-08-31 18:55:52 +00:00
parent c1dc78de76
commit 869a144f4e
1 changed files with 11 additions and 5 deletions

16
lib/Transforms/Scalar/CorrelatedValuePropagation.cpp

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