vendor/llvm/llvm-trunk-r300422

1 files changed, 18 insertions, 0 deletions

diff --git a/include/llvm/Analysis/BasicAliasAnalysis.h b/include/llvm/Analysis/BasicAliasAnalysis.h
index addfffa01061..14e4bded264a 100644
--- a/include/llvm/Analysis/BasicAliasAnalysis.h
+++ b/include/llvm/Analysis/BasicAliasAnalysis.h
@@ -233,6 +233,24 @@ FunctionPass *createBasicAAWrapperPass();
 /// populated to the best of our ability for a particular function when inside
 /// of a \c ModulePass or a \c CallGraphSCCPass.
 BasicAAResult createLegacyPMBasicAAResult(Pass &P, Function &F);
+
+/// This class is a functor to be used in legacy module or SCC passes for
+/// computing AA results for a function. We store the results in fields so that
+/// they live long enough to be queried, but we re-use them each time.
+class LegacyAARGetter {
+  Pass &P;
+  Optional<BasicAAResult> BAR;
+  Optional<AAResults> AAR;
+
+public:
+  LegacyAARGetter(Pass &P) : P(P) {}
+  AAResults &operator()(Function &F) {
+    BAR.emplace(createLegacyPMBasicAAResult(P, F));
+    AAR.emplace(createLegacyPMAAResults(P, F, *BAR));
+    return *AAR;
+  }
+};
+
 }
 
 #endif