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cache dereferenced iterators

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108132 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif 2010-07-12 10:49:54 +00:00
parent a8b9df7bd9
commit f1b2874c68
1 changed files with 5 additions and 3 deletions
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8
lib/Transforms/Utils/Local.cpp
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@ -432,9 +432,11 @@ static bool CanPropagatePredecessorsForPHIs(BasicBlock *BB, BasicBlock *Succ) {
// Use that list to make another list of common predecessors of BB and Succ
BlockSet CommonPreds;
for (pred_iterator PI = pred_begin(Succ), PE = pred_end(Succ);
PI != PE; ++PI)
if (BBPreds.count(*PI))
CommonPreds.insert(*PI);
PI != PE; ++PI) {
BasicBlock *P = *PI;
if (BBPreds.count(P))
CommonPreds.insert(P);
}
// Shortcut, if there are no common predecessors, merging is always safe
if (CommonPreds.empty())