Request DominanceFrontiner in advance.

llvm-svn: 37954

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopRotation.cpp b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
index 807d463abb8..2a7b06c6c3f 100644
--- a/llvm/lib/Transforms/Scalar/LoopRotation.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
@@ -63,6 +63,11 @@ namespace {
       AU.addRequiredID(LoopSimplifyID);
       AU.addPreservedID(LoopSimplifyID);
       AU.addPreserved<DominatorTree>();
+      // Request DominanceFrontier now, even though Loop Rotate does
+      // not use it. This allows Pass Manager to schedule Dominance
+      // Frontier early enough such that one LPPassManager can handle
+      // loop rotate as well as licm pass.
+      AU.addRequired<DominanceFrontier>(); 
       AU.addPreserved<DominanceFrontier>();
     }