gcc/testsuite/gcc.c-torture/execute/20070919-1.c

   1 /* PR c/33238 */
   2 /* { dg-require-effective-target alloca } */
   3
   4 typedef __SIZE_TYPE__ size_t;
   5 int memcmp (const void *, const void *, size_t);
   6 void abort (void);
   7
   8 void
   9 __attribute__((noinline))
  10 bar (void *x, void *y)
  11 {
  12   struct S { char w[8]; } *p = x, *q = y;
  13   if (memcmp (p->w, "zyxwvut", 8) != 0)
  14     abort ();
  15   if (memcmp (q[0].w, "abcdefg", 8) != 0)
  16     abort ();
  17   if (memcmp (q[1].w, "ABCDEFG", 8) != 0)
  18     abort ();
  19   if (memcmp (q[2].w, "zyxwvut", 8) != 0)
  20     abort ();
  21   if (memcmp (q[3].w, "zyxwvut", 8) != 0)
  22     abort ();
  23 }
  24
  25 void
  26 __attribute__((noinline))
  27 foo (void *x, int y)
  28 {
  29   struct S { char w[y]; } *p = x, a;
  30   int i;
  31   a = ({ struct S b; b = p[2]; p[3] = b; });
  32   bar (&a, x);
  33 }
  34
  35 int
  36 main (void)
  37 {
  38   struct S { char w[8]; } p[4]
  39     = { "abcdefg", "ABCDEFG", "zyxwvut", "ZYXWVUT" };
  40   foo (p, 8);
  41   return 0;
  42 }