commit a6a4aaefeea8622e022723f27b7e845997b81f64
author Dan Gohman <gohman@apple.com> Thu Nov 05 19:41:37 2009 +0000
committer Dan Gohman <gohman@apple.com> Thu Nov 05 19:41:37 2009 +0000
tree 9aa092d044982f00e5a7c46c90e2af511f4ced6e
parent 6890584ab16d425865cb4b833fd809313d28e566

Fix IVUsers to avoid assuming that the loop has a unique backedge.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86161 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/IVUsers.cpp

diff --git a/lib/Analysis/IVUsers.cpp b/lib/Analysis/IVUsers.cpp
index 543e017..20b69f2 100644
--- a/lib/Analysis/IVUsers.cpp
+++ b/lib/Analysis/IVUsers.cpp
@@ -151,6 +151,8 @@
   if (L->contains(User->getParent())) return false;
 
   BasicBlock *LatchBlock = L->getLoopLatch();
+  if (!LatchBlock)
+    return false;
 
   // Ok, the user is outside of the loop.  If it is dominated by the latch
   // block, use the post-inc value.