[llvm-commits] [llvm] r40638 - /llvm/trunk/lib/Transforms/Scalar/LICM.cpp

[Devang Patel]

Author: dpatel
Date: Tue Jul 31 11:52:25 2007
New Revision: 40638

URL: http://llvm.org/viewvc/llvm-project?rev=40638&view=rev
Log:
Add note.

Modified:
    llvm/trunk/lib/Transforms/Scalar/LICM.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/LICM.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LICM.cpp?rev=40638&r1=40637&r2=40638&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LICM.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LICM.cpp Tue Jul 31 11:52:25 2007
@@ -218,7 +218,9 @@
 
 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;