From 90f1ad7bf4d98a47b5919dc1e9fd66dc1c1905b4 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Mon, 5 Feb 2007 19:34:17 +0000
Subject: [PATCH] Fix PR1158

Do not insert Analysis pass, if it is already available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33915 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/PassManager.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index f8b311be7ec..02938710fac 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -377,6 +377,11 @@ void PMTopLevelManager::schedulePass(Pass *P) {
   // TODO : Allocate function manager for this pass, other wise required set
   // may be inserted into previous function manager
 
+  // If this Analysis is already requested by one of the previous pass
+  // and it is still available then do not insert new pass in the queue again.
+  if (findAnalysisPass(P->getPassInfo()))
+      return;
+
   AnalysisUsage AnUsage;
   P->getAnalysisUsage(AnUsage);
   const std::vector<AnalysisID> &RequiredSet = AnUsage.getRequiredSet();