From efd7f9c360ae90b4111030d94477579a8c8f79c5 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Fri, 16 Jul 2010 17:58:45 +0000
Subject: Reorder the contents of various getAnalysisUsage functions,
 eliminating a redundant loopsimplify run from the default -O2 sequence.

llvm-svn: 108539
---
 llvm/lib/Transforms/Utils/LoopSimplify.cpp | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'llvm/lib/Transforms/Utils/LoopSimplify.cpp')

diff --git a/llvm/lib/Transforms/Utils/LoopSimplify.cpp b/llvm/lib/Transforms/Utils/LoopSimplify.cpp
index 4f4edf3a754..703689e512e 100644
--- a/llvm/lib/Transforms/Utils/LoopSimplify.cpp
+++ b/llvm/lib/Transforms/Utils/LoopSimplify.cpp
@@ -77,12 +77,19 @@ namespace {
 
     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.
-- 
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