From: Dan Gohman <gohman@apple.com>
Date: Mon, 23 Feb 2009 17:10:29 +0000 (+0000)
Subject: LoopDeletion needs to inform ScalarEvolution when a loop is deleted,
X-Git-Tag: android-x86-6.0-r1~1003^2~22300
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=e2abdd3ff0dd54a59edbd114ebb1d7728040a2d9;p=android-x86%2Fexternal-llvm.git

LoopDeletion needs to inform ScalarEvolution when a loop is deleted,
so that ScalarEvolution doesn't hang onto a dangling Loop*, which
could be a problem if another Loop happens to get allocated at the
same address.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65323 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LoopDeletion.cpp b/lib/Transforms/Scalar/LoopDeletion.cpp
index 86edcfaac80..ac807a4c9b2 100644
--- a/lib/Transforms/Scalar/LoopDeletion.cpp
+++ b/lib/Transforms/Scalar/LoopDeletion.cpp
@@ -260,7 +260,10 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
   for (Loop::block_iterator LI = L->block_begin(), LE = L->block_end();
        LI != LE; ++LI)
     (*LI)->eraseFromParent();
-  
+
+  // Tell ScalarEvolution that the loop is deleted.
+  SE.forgetLoopIterationCount(L);
+
   // Finally, the blocks from loopinfo.  This has to happen late because
   // otherwise our loop iterators won't work.
   LoopInfo& loopInfo = getAnalysis<LoopInfo>();