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| author | Andrew Trick <atrick@apple.com> | 2013-07-20 23:10:31 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-07-20 23:10:31 +0000 |
| commit | 360fef5f4354be1c58089ed7610ba8d5f1f976f9 (patch) | |
| tree | 74860cf199718ed046e4f7e151baaa447f67bf7b | |
| parent | fa873afbdf870bcc025e77f4932364f1a2e38a7b (diff) | |
| download | external_llvm-360fef5f4354be1c58089ed7610ba8d5f1f976f9.zip external_llvm-360fef5f4354be1c58089ed7610ba8d5f1f976f9.tar.gz external_llvm-360fef5f4354be1c58089ed7610ba8d5f1f976f9.tar.bz2 | |
Comment: try to clarify loop iteration order.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186774 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Analysis/LoopPass.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Analysis/LoopPass.cpp b/lib/Analysis/LoopPass.cpp index 1540112..acf2ba6 100644 --- a/lib/Analysis/LoopPass.cpp +++ b/lib/Analysis/LoopPass.cpp @@ -188,6 +188,10 @@ bool LPPassManager::runOnFunction(Function &F) { // 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 // 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) addLoopIntoQueue(*I, LQ); |