From 5e01f80bf85b9a68352d4c146caa9ddcf6af6dcf Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Thu, 11 Oct 2012 02:05:23 +0000
Subject: Don't crash when !tbaa.struct contents is invalid.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165693 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/InstCombine/InstCombineCalls.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/Transforms/InstCombine')

diff --git a/lib/Transforms/InstCombine/InstCombineCalls.cpp b/lib/Transforms/InstCombine/InstCombineCalls.cpp
index f92c4ba..04b7b21 100644
--- a/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -111,10 +111,13 @@ Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
         // get the TBAA tag describing our copy.
         if (MDNode *M = MI->getMetadata(LLVMContext::MD_tbaa_struct)) {
           if (M->getNumOperands() == 3 &&
+              M->getOperand(0) &&
               isa<ConstantInt>(M->getOperand(0)) &&
               cast<ConstantInt>(M->getOperand(0))->isNullValue() &&
+              M->getOperand(1) &&
               isa<ConstantInt>(M->getOperand(1)) &&
               cast<ConstantInt>(M->getOperand(1))->getValue() == Size &&
+              M->getOperand(2) &&
               isa<MDNode>(M->getOperand(2)))
             CopyMD = cast<MDNode>(M->getOperand(2));
         }
-- 
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