Request DominanceFrontiner in advance.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37954 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/LoopRotation.cpp b/lib/Transforms/Scalar/LoopRotation.cpp
index 807d463abb..2a7b06c6c3 100644
--- a/lib/Transforms/Scalar/LoopRotation.cpp
+++ b/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>();
     }