re PR tree-optimization/65258 (Wrong array bounds warning)

2017-12-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/65258
	* gcc.dg/Warray-bounds-23.c: New testcase.

From-SVN: r255641

gcc/testsuite/ChangeLog

+2017-12-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/65258
+	* gcc.dg/Warray-bounds-23.c: New testcase.
+
 2017-12-14  Tom de Vries  <tom@codesourcery.com>
 
 	* lib/target-supports.exp (check_effective_target_weak_undefined): New

gcc/testsuite/gcc.dg/Warray-bounds-23.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -Warray-bounds" } */
+
+int main()
+{
+  unsigned i, j, a[10] = {0};
+
+  for (j = 23; j < 25; j++){
+      for (i = j / 8; i --> 0;) a[i] = 0; /* { dg-bogus "array bounds" } */
+      for (i =     1; i --> 0;) __builtin_printf("%u", a[i]);
+  }
+
+  return 0;
+}
+