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Comment: try to clarify loop iteration order.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186774 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-07-20 23:10:31 +00:00
parent fa873afbdf
commit 360fef5f43
1 changed files with 4 additions and 0 deletions
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lib/Analysis/LoopPass.cpp
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@ -188,6 +188,10 @@ bool LPPassManager::runOnFunction(Function &F) {
// advantage in deleting uses in a later loop before optimizing the // advantage in deleting uses in a later loop before optimizing the
// definitions in an earlier loop. If we find a clear reason to process in // definitions in an earlier loop. If we find a clear reason to process in
// forward order, then a forward variant of LoopPassManager should be created. // forward order, then a forward variant of LoopPassManager should be created.
//
// Note that LoopInfo::iterator visits loops in reverse program
// order. Here, reverse_iterator gives us a forward order, and the LoopQueue
// reverses the order a third time by popping from the back.
for (LoopInfo::reverse_iterator I = LI->rbegin(), E = LI->rend(); I != E; ++I) for (LoopInfo::reverse_iterator I = LI->rbegin(), E = LI->rend(); I != E; ++I)
addLoopIntoQueue(*I, LQ); addLoopIntoQueue(*I, LQ);