Fix PR2028

llvm-svn: 47150

2 files changed, 7 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopRotation.cpp b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
index 8581f9ead74..153f09563df 100644
--- a/llvm/lib/Transforms/Scalar/LoopRotation.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
@@ -56,12 +56,12 @@ namespace {
 
     // LCSSA form makes instruction renaming easier.
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.addRequiredID(LoopSimplifyID);
+      AU.addPreservedID(LoopSimplifyID);
       AU.addRequiredID(LCSSAID);
       AU.addPreservedID(LCSSAID);
       AU.addPreserved<ScalarEvolution>();
       AU.addPreserved<LoopInfo>();
-      AU.addRequiredID(LoopSimplifyID);
-      AU.addPreservedID(LoopSimplifyID);
       AU.addPreserved<DominatorTree>();
       AU.addPreserved<DominanceFrontier>();
     }
diff --git a/llvm/test/Other/2008-02-14-PassManager.ll b/llvm/test/Other/2008-02-14-PassManager.ll
new file mode 100644
index 00000000000..985e1908ef0
--- /dev/null
+++ b/llvm/test/Other/2008-02-14-PassManager.ll
@@ -0,0 +1,5 @@
+; RUN:  llvm-as < %s |  opt -loop-unroll -loop-rotate -simplifycfg -disable-output
+; PR 2028
+define i32 @test1() {
+       ret i32 0;
+}