Do not record last users of Pass Manager.

llvm-svn: 33243

1 files changed, 7 insertions, 2 deletions

diff --git a/llvm/lib/VMCore/PassManager.cpp b/llvm/lib/VMCore/PassManager.cpp
index 376e1b798e9..d48c198bbff 100644
--- a/llvm/lib/VMCore/PassManager.cpp
+++ b/llvm/lib/VMCore/PassManager.cpp
@@ -594,8 +594,13 @@ void PMDataManager::add(Pass *P,
       }
     }
 
-    LastUses.push_back(P);
-    TPM->setLastUser(LastUses, P);
+    // Set P as P's last user until someone starts using P.
+    // However, if P is a Pass Manager then it does not need
+    // to record its last user.
+    if (!dynamic_cast<PMDataManager *>(P)) {
+      LastUses.push_back(P);
+      TPM->setLastUser(LastUses, P);
+    }
 
     // Take a note of analysis required and made available by this pass.
     // Remove the analysis not preserved by this pass