From 8d246f09cb46fe38aa71d2a4edcd84f30c4bf80e Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Tue, 31 Jul 2007 16:52:25 +0000
Subject: [PATCH] Add note.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40638 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LICM.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp
index 669afa33ac9..ede3bd9dde6 100644
--- a/lib/Transforms/Scalar/LICM.cpp
+++ b/lib/Transforms/Scalar/LICM.cpp
@@ -218,7 +218,9 @@ namespace {
 
 LoopPass *llvm::createLICMPass() { return new LICM(); }
 
-/// Hoist expressions out of the specified loop...
+/// Hoist expressions out of the specified loop. Note, alias info for inner
+/// loop is not preserved so it is not a good idea to run LICM multiple 
+/// times on one loop.
 ///
 bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) {
   Changed = false;