re PR middle-end/30286 (Segfault with -O2 -ftrapv)

	PR middle-end/30286
	* gcc.dg/pr30286.c: New test.

From-SVN: r120387

gcc/testsuite/ChangeLog

 2007-01-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/30286
+	* gcc.dg/pr30286.c: New test.
+
 	PR c++/29535
 	* g++.dg/template/crash66.C: New test.
 

gcc/testsuite/gcc.dg/pr30286.c

+/* PR middle-end/30286 */
+/* { dg-do run } */
+/* { dg-options "-O2 -ftrapv" } */
+
+extern void abort (void);
+struct S { struct S *s; };
+struct T { struct S *t[25]; };
+
+void
+__attribute__((noinline))
+foo (int i, struct T *x, struct S *y)
+{
+  int j;
+  for (j = 14; j > i; j--)
+    x->t[j] = y->s;
+}
+
+int
+main (void)
+{
+  struct S s;
+  struct T t;
+  int i;
+
+  s.s = &s;
+  __builtin_memset (&t, 0, sizeof (t));
+  foo (6, &t, &s);
+  for (i = 0; i < 25; i++)
+    if (t.t[i] != ((i > 6 && i <= 14) ? &s : (struct S *) 0))
+      abort ();
+  __builtin_memset (&t, 0, sizeof (t));
+  foo (-1, &t, &s);
+  for (i = 0; i < 25; i++)
+    if (t.t[i] != ((i >= 0 && i <= 14) ? &s : (struct S *) 0))
+      abort ();
+  return 0;
+}