Fix UBSan bootstrap: don't bind reference to nullptr.
authorAlexey Samsonov <vonosmas@gmail.com>
Tue, 23 Dec 2014 04:15:47 +0000 (04:15 +0000)
committerAlexey Samsonov <vonosmas@gmail.com>
Tue, 23 Dec 2014 04:15:47 +0000 (04:15 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224751 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/RegAllocPBQP.h

index 540af08..3badfe0 100644 (file)
@@ -192,8 +192,10 @@ public:
     : RS(Other.RS), NumOpts(Other.NumOpts), DeniedOpts(Other.DeniedOpts),
       OptUnsafeEdges(new unsigned[NumOpts]), VReg(Other.VReg),
       AllowedRegs(Other.AllowedRegs) {
-    std::copy(&Other.OptUnsafeEdges[0], &Other.OptUnsafeEdges[NumOpts],
-              &OptUnsafeEdges[0]);
+    if (NumOpts > 0) {
+      std::copy(&Other.OptUnsafeEdges[0], &Other.OptUnsafeEdges[NumOpts],
+                &OptUnsafeEdges[0]);
+    }
   }
 
   // FIXME: Re-implementing default behavior to work around MSVC. Remove once