[llvm-commits] [llvm] r40604 - /llvm/trunk/lib/Transforms/Utils/LCSSA.cpp

[Devang Patel]

Author: dpatel
Date: Mon Jul 30 15:23:45 2007
New Revision: 40604

URL: http://llvm.org/viewvc/llvm-project?rev=40604&view=rev
Log:
LCSSA preserves dom info.


Modified:
    llvm/trunk/lib/Transforms/Utils/LCSSA.cpp

Modified: llvm/trunk/lib/Transforms/Utils/LCSSA.cpp
URL: 
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LCSSA.cpp?rev=40604&r1=40603&r2=40604&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Utils/LCSSA.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/LCSSA.cpp Mon Jul 30 15:23:45 2007
@@ -73,6 +73,14 @@
       AU.addPreserved<LoopInfo>();
       AU.addRequired<DominatorTree>();
       AU.addPreserved<ScalarEvolution>();
+      AU.addPreserved<DominatorTree>();
+
+      // Request DominanceFrontier now, even though LCSSA does
+      // not use it. This allows Pass Manager to schedule Dominance
+      // Frontier early enough such that one LPPassManager can handle
+      // multiple loop transformation passes.
+      AU.addRequired<DominanceFrontier>(); 
+      AU.addPreserved<DominanceFrontier>();
     }
   private:
     void getLoopValuesUsedOutsideLoop(Loop *L,


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