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Fix a performance problem with the new SSAUpdater. This showed up in the

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GCCAS time for MultiSource/Benchmarks/ASCI_Purple/SMG2000.

llvm-svn: 102009
This commit is contained in:
Bob Wilson 2010-04-21 18:39:03 +00:00
parent c23127cb7e
commit 7716410af6
1 changed files with 8 additions and 2 deletions
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10
lib/Transforms/Utils/SSAUpdater.cpp
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@ -529,9 +529,15 @@ void SSAUpdater::FindAvailableVals(BlockListTy *BlockList) {
E = BlockList->rend(); I != E; ++I) {
BBInfo *Info = *I;
// Check if this block contains a newly added PHI.
if (Info->DefBB != Info)
if (Info->DefBB != Info) {
// Record the available value at join nodes to speed up subsequent
// uses of this SSAUpdater for the same value.
if (Info->NumPreds > 1)
AvailableVals[Info->BB] = Info->DefBB->AvailableVal;
continue;
}
// Check if this block contains a newly added PHI.
PHINode *PHI = dyn_cast<PHINode>(Info->AvailableVal);
if (!PHI || PHI->getNumIncomingValues() == Info->NumPreds)
continue;