re PR tree-optimization/33707 (scev not handling unsigned conversion)

	gcc/testsuite
	PR tree-optimization/33707
	* gcc.dg/vect/pr33707.c: New test.

From-SVN: r239292

gcc/testsuite/ChangeLog

 2016-08-09  Bin Cheng  <bin.cheng@arm.com>
 
+	PR tree-optimization/33707
+	* gcc.dg/vect/pr33707.c: New test.
+
+2016-08-09  Bin Cheng  <bin.cheng@arm.com>
+
 	PR tree-optimization/pr72772
 	* gcc.dg/tree-ssa/pr72772.c: New test.
 

gcc/testsuite/gcc.dg/vect/pr33707.c

+/* { dg-do compile } */
+/* { dg-require-effective-target vect_int } */
+
+int
+foo (char *a, unsigned n)
+{
+    int i;
+    a[0] = 0;
+    for (i = 16; i < n; i++)
+      a[i] = a[i-16];
+}
+/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */