From 9bfa6fec068abb8bea4da03e5c9c39765f963ef2 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Wed, 1 Sep 2010 18:27:22 +0000
Subject: [PATCH] JumpThreading keeps LazyValueInfo up to date, so we don't
 need to rerun it if we schedule another LVI-using pass afterwards.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112722 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/JumpThreading.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp
index abf98866aec..6fd8ed10eff 100644
--- a/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/lib/Transforms/Scalar/JumpThreading.cpp
@@ -100,8 +100,10 @@ namespace {
     bool runOnFunction(Function &F);
     
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      if (EnableLVI)
+      if (EnableLVI) {
         AU.addRequired<LazyValueInfo>();
+        AU.addPreserved<LazyValueInfo>();
+      }
     }
     
     void FindLoopHeaders(Function &F);