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Basic blocks typically have few predecessors. Use a SmallDenseMap to 

avoid a heap allocation when this is the case.

llvm-svn: 192602
This commit is contained in:
Chris Lattner 2013-10-14 16:05:55 +00:00
parent e8d060dba9
commit 94fc4bed1f
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/Transforms/Utils/SSAUpdater.cpp
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@ -63,7 +63,7 @@ void SSAUpdater::AddAvailableValue(BasicBlock *BB, Value *V) {
}
static bool IsEquivalentPHI(PHINode *PHI,
DenseMap<BasicBlock*, Value*> &ValueMapping) {
SmallDenseMap<BasicBlock*, Value*, 8> &ValueMapping) {
unsigned PHINumValues = PHI->getNumIncomingValues();
if (PHINumValues != ValueMapping.size())
return false;
@ -136,8 +136,8 @@ Value *SSAUpdater::GetValueInMiddleOfBlock(BasicBlock *BB) {
// Otherwise, we do need a PHI: check to see if we already have one available
// in this block that produces the right value.
if (isa<PHINode>(BB->begin())) {
DenseMap<BasicBlock*, Value*> ValueMapping(PredValues.begin(),
PredValues.end());
SmallDenseMap<BasicBlock*, Value*, 8> ValueMapping(PredValues.begin(),
PredValues.end());
PHINode *SomePHI;
for (BasicBlock::iterator It = BB->begin();
(SomePHI = dyn_cast<PHINode>(It)); ++It) {