From 127563b216eadf756e03f0adf2c3900bf244b504 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Wed, 30 May 2012 18:42:43 +0000
Subject: [PATCH] Make sure that we're dealing with a binary SCEVExpr when
 simplifying.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157704 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/ScalarEvolution.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index c45cc8d0f8c..b49c65f3706 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -5654,7 +5654,8 @@ bool ScalarEvolution::SimplifyICmpOperands(ICmpInst::Predicate &Pred,
       if (!RA)
         if (const SCEVAddExpr *AE = dyn_cast<SCEVAddExpr>(LHS))
           if (const SCEVMulExpr *ME = dyn_cast<SCEVMulExpr>(AE->getOperand(0)))
-            if (ME->getOperand(0)->isAllOnesValue()) {
+            if (AE->getNumOperands() == 2 && ME->getNumOperands() == 2 &&
+                ME->getOperand(0)->isAllOnesValue()) {
               RHS = AE->getOperand(1);
               LHS = ME->getOperand(1);
               Changed = true;