From 9702901a1efb85792c35dc33831583e9e4045cf7 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Sun, 27 Sep 2009 23:43:07 +0000
Subject: [PATCH] When a loop is deleted, immediately release all of the active
 LoopPasses for that loop. This avoids trouble with the PassManager trying to
 call verifyAnalysis on them, and frees up some memory sooner rather than
 later.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82945 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/LoopPass.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/Analysis/LoopPass.cpp b/lib/Analysis/LoopPass.cpp
index 08615c4e14e..4f7018da1ac 100644
--- a/lib/Analysis/LoopPass.cpp
+++ b/lib/Analysis/LoopPass.cpp
@@ -253,6 +253,15 @@ bool LPPassManager::runOnFunction(Function &F) {
         break;
     }
     
+    // If the loop was deleted, release all the loop passes. This frees up
+    // some memory, and avoids trouble with the pass manager trying to call
+    // verifyAnalysis on them.
+    if (skipThisLoop)
+      for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {  
+        Pass *P = getContainedPass(Index);
+        freePass(P, "", ON_LOOP_MSG);
+      }
+
     // Pop the loop from queue after running all passes.
     LQ.pop_back();