Add test-case (PR tree-optimization/66278).

2017-04-21  Martin Liska  <mliska@suse.cz>

	PR tree-optimization/66278
	* gcc.dg/vect/pr66278.c: New test.

From-SVN: r247051

gcc/testsuite/ChangeLog

+2017-04-21  Martin Liska  <mliska@suse.cz>
+
+	PR tree-optimization/66278
+	* gcc.dg/vect/pr66278.c: New test.
+
 2017-04-21  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/80237

gcc/testsuite/gcc.dg/vect/pr66278.c

+/* { dg-do compile } */
+#define N 101
+
+typedef unsigned int __uint32_t;
+
+int main(int argc, char **argv)
+{
+  __uint32_t array[N][N][N];
+
+  const unsigned int next = argc == 3 ? 0 : 1;
+
+  for (unsigned i = next; i < N;  i++)
+    array[3][3][i] = array[3][3][i] - 10;
+
+  return array[3][3][argc];
+}
+
+/* { dg-final { scan-tree-dump-times "LOOP VECTORIZED" 1 "vect" } } */
+/* { dg-require-effective-target vect_int } */