[llvm-commits] [llvm] r166788 - /llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp

[Benjamin Kramer]

Author: d0k
Date: Fri Oct 26 12:40:50 2012
New Revision: 166788

URL: http://llvm.org/viewvc/llvm-project?rev=166788&view=rev
Log:
LoopSimplify: Preserve DependenceAnalysis.

This is currently true, but may change when DA grows more aggressive caching.
Without this setting it's impossible to use DA from a LoopPass because DA is a
function pass and cannot be properly scheduled in between LoopPasses. The
LoopManager reacts to this with an infinite loop which made this really annoying
to debug.

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

Modified: llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp?rev=166788&r1=166787&r2=166788&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp Fri Oct 26 12:40:50 2012
@@ -46,6 +46,7 @@
 #include "llvm/LLVMContext.h"
 #include "llvm/Type.h"
 #include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/DependenceAnalysis.h"
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/InstructionSimplify.h"
 #include "llvm/Analysis/LoopPass.h"
@@ -89,6 +90,7 @@
 
       AU.addPreserved<AliasAnalysis>();
       AU.addPreserved<ScalarEvolution>();
+      AU.addPreserved<DependenceAnalysis>();
       AU.addPreservedID(BreakCriticalEdgesID);  // No critical edges added.
     }