From 3ff92c7452de805d8a689845211e4c52aeae4769 Mon Sep 17 00:00:00 2001
From: Davide Italiano <davide@freebsd.org>
Date: Mon, 6 Jun 2016 20:01:50 +0000
Subject: [PATCH] [PM] Preserve the correct set of analyses for GVN.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271934 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/GVN.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index ef9638b9aa0..c3fcbbffeba 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -594,7 +594,12 @@ PreservedAnalyses GVN::run(Function &F, AnalysisManager<Function> &AM) {
   auto &AA = AM.getResult<AAManager>(F);
   auto &MemDep = AM.getResult<MemoryDependenceAnalysis>(F);
   bool Changed = runImpl(F, AC, DT, TLI, AA, &MemDep);
-  return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
+  if (!Changed)
+    return PreservedAnalyses::all();
+  PreservedAnalyses PA;
+  PA.preserve<DominatorTreeAnalysis>();
+  PA.preserve<GlobalsAA>();
+  return PA;
 }
 
 LLVM_DUMP_METHOD