From c83889ad906b130f39ba8f776111e51439c2a7ac Mon Sep 17 00:00:00 2001
From: Torok Edwin <edwintorok@gmail.com>
Date: Mon, 27 Oct 2008 10:18:45 +0000
Subject: [PATCH] Avoid crashing if instruction is not part of a loop. If it is
 not part of a loop it is obviously invariant wrt to all loops.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58240 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/LoopVR.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Analysis/LoopVR.cpp b/lib/Analysis/LoopVR.cpp
index 7f5de259caf..d0b77b89f0a 100644
--- a/lib/Analysis/LoopVR.cpp
+++ b/lib/Analysis/LoopVR.cpp
@@ -247,12 +247,13 @@ ConstantRange LoopVR::compute(Value *V) {
     return ConstantRange(cast<IntegerType>(V->getType())->getBitWidth(), false);
 
   LoopInfo &LI = getAnalysis<LoopInfo>();
-  ScalarEvolution &SE = getAnalysis<ScalarEvolution>();
 
   Loop *L = LI.getLoopFor(I->getParent());
-  if (L->isLoopInvariant(I))
+  if (!L || L->isLoopInvariant(I))
     return ConstantRange(cast<IntegerType>(V->getType())->getBitWidth(), false);
 
+  ScalarEvolution &SE = getAnalysis<ScalarEvolution>();
+
   SCEVHandle S = SE.getSCEV(I);
   if (isa<SCEVUnknown>(S) || isa<SCEVCouldNotCompute>(S))
     return ConstantRange(cast<IntegerType>(V->getType())->getBitWidth(), false);