re PR middle-end/40946 (Spurious array subscript is above bounds warning)

	PR middle-end/40946
	* gcc.dg/pr40946.c: New test.

From-SVN: r154047

gcc/testsuite/ChangeLog

+2009-11-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/40946
+	* gcc.dg/pr40946.c: New test.
+
 2009-11-09  Jason Merrill  <jason@redhat.com>
 
 	PR c++/41972

gcc/testsuite/gcc.dg/pr40946.c

+/* PR middle-end/40946 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wall" } */
+
+struct A
+{
+  unsigned char a1[8];
+  unsigned short a2, a3, a4, a5, a6, a7;
+};
+
+int bar (void *, const char *, int);
+char *foo (void *, int);
+
+char *
+baz (const char *x, const char *y)
+{
+  int a = sizeof (struct A) + 2 * (__builtin_strlen (y)
+				   + __builtin_strlen (x) + 24) + 16;
+  struct A *b = __builtin_malloc (a);
+  char *c;
+  int d;
+
+  b->a4 = sizeof (struct A);
+  c = ((char *) b) + b->a4;
+  d = ((char *) b) + a - c;
+  b->a2 = b->a3 = (unsigned short) bar (c, y, d); /* { dg-bogus "array subscript is above array bounds" } */
+  c += b->a2;
+  d = ((char *) b) + a - c;
+  b->a7 = b->a4 + b->a2;
+  b->a5 = b->a6 = (unsigned short) bar (c, x, d);
+  c = foo (b, a);
+  return c;
+}