Reorder the contents of various getAnalysisUsage functions, eliminating
a redundant loopsimplify run from the default -O2 sequence.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108539 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/LoopSimplify.cpp b/lib/Transforms/Utils/LoopSimplify.cpp
index 4f4edf3..703689e 100644
--- a/lib/Transforms/Utils/LoopSimplify.cpp
+++ b/lib/Transforms/Utils/LoopSimplify.cpp
@@ -77,12 +77,19 @@
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
// We need loop information to identify the loops...
- AU.addRequiredTransitive<LoopInfo>();
AU.addRequiredTransitive<DominatorTree>();
-
- AU.addPreserved<LoopInfo>();
AU.addPreserved<DominatorTree>();
+
+ // Request DominanceFrontier now, even though LoopSimplify 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>();
+
+ AU.addRequiredTransitive<LoopInfo>();
+ AU.addPreserved<LoopInfo>();
+
AU.addPreserved<AliasAnalysis>();
AU.addPreserved<ScalarEvolution>();
AU.addPreservedID(BreakCriticalEdgesID); // No critical edges added.