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another case of reuse result of operator*, it is expensive to recompute

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif 2010-07-09 10:32:31 +00:00
parent f6c166078f
commit 4fd6b39703
1 changed files with 6 additions and 4 deletions
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10
include/llvm/Analysis/LoopInfo.h
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@ -285,12 +285,14 @@ public:
typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
for (typename InvBlockTraits::ChildIteratorType PI =
InvBlockTraits::child_begin(Header),
PE = InvBlockTraits::child_end(Header); PI != PE; ++PI)
if (!contains(*PI)) { // If the block is not in the loop...
if (Out && Out != *PI)
PE = InvBlockTraits::child_end(Header); PI != PE; ++PI) {
typename InvBlockTraits::NodeType *N = *PI;
if (!contains(N)) { // If the block is not in the loop...
if (Out && Out != N)
return 0; // Multiple predecessors outside the loop
Out = *PI;
Out = N;
}
}
// Make sure there is only one exit out of the preheader.
assert(Out && "Header of loop has no predecessors from outside loop?");