[PM] Preserve the correct set of analyses for GVN.

llvm-svn: 271934

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index ef9638b9aa0..c3fcbbffeba 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/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