From 687cee6bae6255380f01ea6d5608f2d16cd62603 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108539 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/LCSSA.cpp | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

(limited to 'lib/Transforms/Utils/LCSSA.cpp')

diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp
index e90c30b..5967cb9 100644
--- a/lib/Transforms/Utils/LCSSA.cpp
+++ b/lib/Transforms/Utils/LCSSA.cpp
@@ -64,22 +64,18 @@ namespace {
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesCFG();
 
+      AU.addRequiredTransitive<DominatorTree>();
+      AU.addPreserved<DominatorTree>();
+      AU.addPreserved<DominanceFrontier>();
+      AU.addRequiredTransitive<LoopInfo>();
+      AU.addPreserved<LoopInfo>();
+
       // LCSSA doesn't actually require LoopSimplify, but the PassManager
       // doesn't know how to schedule LoopSimplify by itself.
       AU.addRequiredID(LoopSimplifyID);
       AU.addPreservedID(LoopSimplifyID);
-      AU.addRequiredTransitive<LoopInfo>();
-      AU.addPreserved<LoopInfo>();
-      AU.addRequiredTransitive<DominatorTree>();
-      AU.addPreserved<ScalarEvolution>();
-      AU.addPreserved<DominatorTree>();
 
-      // Request DominanceFrontier now, even though LCSSA 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.addPreserved<ScalarEvolution>();
     }
   private:
     bool ProcessInstruction(Instruction *Inst,
-- 
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