diff options
Diffstat (limited to 'include/llvm/ADT/PostOrderIterator.h')
| -rw-r--r-- | include/llvm/ADT/PostOrderIterator.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/llvm/ADT/PostOrderIterator.h b/include/llvm/ADT/PostOrderIterator.h index e519b5c07964..8fc08eb252eb 100644 --- a/include/llvm/ADT/PostOrderIterator.h +++ b/include/llvm/ADT/PostOrderIterator.h @@ -268,6 +268,10 @@ inverse_post_order_ext(const T &G, SetType &S) { // with a postorder iterator to build the data structures). The moral of this // story is: Don't create more ReversePostOrderTraversal classes than necessary. // +// Because it does the traversal in its constructor, it won't invalidate when +// BasicBlocks are removed, *but* it may contain erased blocks. Some places +// rely on this behavior (i.e. GVN). +// // This class should be used like this: // { // ReversePostOrderTraversal<Function*> RPOT(FuncPtr); // Expensive to create |