From 2c2b933037ecd5a0ebcfa3077606892802c04a29 Mon Sep 17 00:00:00 2001
From: Cameron Zwarich <zwarich@apple.com>
Date: Thu, 10 Feb 2011 23:53:14 +0000
Subject: [PATCH] If we can't avoid running loop-simplify twice for now, at
 least avoid running iv-users twice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125318 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LoopStrengthReduce.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 01dcfaf0652..ac4aea2e404 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -3824,6 +3824,9 @@ void LoopStrengthReduce::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addPreserved<DominatorTree>();
   AU.addRequired<ScalarEvolution>();
   AU.addPreserved<ScalarEvolution>();
+  // Requiring LoopSimplify a second time here prevents IVUsers from running
+  // twice, since LoopSimplify was invalidated by running ScalarEvolution.
+  AU.addRequiredID(LoopSimplifyID);
   AU.addRequired<IVUsers>();
   AU.addPreserved<IVUsers>();
 }
-- 
2.34.1