Clear VisitedPHIs after use.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84080 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index ce1d8773eff3bae7ab68f85aafd1b833ea1d426b..2c4efc4985b31a3617d5b4256522ec1d203694b7 100644 (file)
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -203,8 +203,10 @@ namespace {
     BasicAliasAnalysis() : NoAA(&ID) {}
     AliasResult alias(const Value *V1, unsigned V1Size,
                       const Value *V2, unsigned V2Size) {
+      assert(VisitedPHIs.empty() && "VisitedPHIs must be cleared after use!");
+      AliasResult Alias = aliasCheck(V1, V1Size, V2, V2Size);
       VisitedPHIs.clear();
-      return aliasCheck(V1, V1Size, V2, V2Size);
+      return Alias;
     }
 
     ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size);