Add a comment for a todo in LoopUnroll post cleanup

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290769 91177308-0d34-0410-b5e6-96231b3b80d8
simoatze · Dec 30, 2016 · 4194070 · 4194070
1 parent ef2b74a
commit 4194070
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/lib/Transforms/Utils/LoopUnroll.cpp b/lib/Transforms/Utils/LoopUnroll.cpp
@@ -673,6 +673,11 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, unsigned TripCount, bool Force,
     }
   }
 
+  // TODO: after peeling or unrolling, previously loop variant conditions are
+  // likely to fold to constants, eagerly propagating those here will require
+  // fewer cleanup passes to be run.  Alternatively, a LoopEarlyCSE might be
+  // appropriate.
+
   NumCompletelyUnrolled += CompletelyUnroll;
   ++NumUnrolled;