From b78d83d837fc72a6565f186b0ad92d48cdfdb805 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Tue, 8 May 2012 02:52:09 +0000
Subject: Allow NULL LoopPassManager argument in UnrollLoop. PR12734.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156358 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/LoopUnrollRuntime.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/Transforms/Utils/LoopUnrollRuntime.cpp')

diff --git a/lib/Transforms/Utils/LoopUnrollRuntime.cpp b/lib/Transforms/Utils/LoopUnrollRuntime.cpp
index 3aa6befe1f..7672726cb3 100644
--- a/lib/Transforms/Utils/LoopUnrollRuntime.cpp
+++ b/lib/Transforms/Utils/LoopUnrollRuntime.cpp
@@ -237,6 +237,8 @@ bool llvm::UnrollRuntimeLoopProlog(Loop *L, unsigned Count, LoopInfo *LI,
 
   // Use Scalar Evolution to compute the trip count.  This allows more
   // loops to be unrolled than relying on induction var simplification
+  if (!LPM)
+    return false;
   ScalarEvolution *SE = LPM->getAnalysisIfAvailable<ScalarEvolution>();
   if (SE == 0)
     return false;
-- 
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