From d224252b5d4ad3528907923fd6304aa33df47314 Mon Sep 17 00:00:00 2001
From: Matt Pharr <matt.pharr@intel.com>
Date: Mon, 31 Oct 2011 08:28:51 -0700
Subject: [PATCH] Fix bug where multiplying varying array offset by zero would
 cause crash in optimization passes.

---
 opt.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/opt.cpp b/opt.cpp
index 9efe63a4..cf342172 100644
--- a/opt.cpp
+++ b/opt.cpp
@@ -2288,7 +2288,7 @@ lVectorIsLinear(llvm::Value **v, int vectorLength, int stride,
             // set of integer values will give a sequence with the desired
             // stride.
             int mulScale = (int)scaleValue->getZExtValue();
-            if ((stride % mulScale) != 0)
+            if (mulScale == 0 || (stride % mulScale) != 0)
                 return false;
 
             llvm::Value **otherValue = (llvm::Value **)alloca(vectorLength * sizeof(llvm::Value *));