Make sure to cast the VLA size of array to the type of size_t. Fixes PR3442.

llvm-svn: 63394

clang/lib/CodeGen/CGExprScalar.cpp

@@ -684,7 +684,10 @@ ScalarExprEmitter::VisitSizeOfAlignOfExpr(const SizeOfAlignOfExpr *E) {
         // sizeof(type) - make sure to emit the VLA size.
         CGF.EmitVLASize(TypeToSize);
       }
-      return CGF.GetVLASize(VAT);
+      
+      llvm::Value *VLASize = CGF.GetVLASize(VAT);
+      return Builder.CreateIntCast(VLASize, ConvertType(E->getType()), 
+                                   false, "conv");
     }
   }
 

clang/test/CodeGen/sizeof-vla.c

@@ -0,0 +1,13 @@
+// RUN: clang -triple x86_64-unknown-unknown -emit-llvm -o %t %s
+
+// PR3442
+
+static void *g(unsigned long len);
+
+void
+f(int n)
+{
+ unsigned begin_set[n];
+ 
+ g(sizeof(begin_set));
+}