From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Fri, 26 Oct 2012 17:40:50 +0000 (+0000)
Subject: LoopSimplify: Preserve DependenceAnalysis.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8999f4777b920ab144a15a6f54a865a07f9c4a7f;p=oota-llvm.git

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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166788 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Utils/LoopSimplify.cpp b/lib/Transforms/Utils/LoopSimplify.cpp
index 8fce2ac68e5..9d9e2016656 100644
--- a/lib/Transforms/Utils/LoopSimplify.cpp
+++ b/lib/Transforms/Utils/LoopSimplify.cpp
@@ -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 @@ namespace {
 
       AU.addPreserved<AliasAnalysis>();
       AU.addPreserved<ScalarEvolution>();
+      AU.addPreserved<DependenceAnalysis>();
       AU.addPreservedID(BreakCriticalEdgesID);  // No critical edges added.
     }