1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Analysis/PostDominators.cpp b/lib/Analysis/PostDominators.cpp
index cb9438a2f92..1caf151546d 100644
--- a/lib/Analysis/PostDominators.cpp
+++ b/lib/Analysis/PostDominators.cpp
@@ -31,6 +31,15 @@ char PostDominatorTreeWrapperPass::ID = 0;
 INITIALIZE_PASS(PostDominatorTreeWrapperPass, "postdomtree",
                 "Post-Dominator Tree Construction", true, true)
 
+bool PostDominatorTree::invalidate(Function &F, const PreservedAnalyses &PA,
+                                   FunctionAnalysisManager::Invalidator &) {
+  // Check whether the analysis, all analyses on functions, or the function's
+  // CFG have been preserved.
+  auto PAC = PA.getChecker<PostDominatorTreeAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 bool PostDominatorTreeWrapperPass::runOnFunction(Function &F) {
   DT.recalculate(F);
   return false;