gcc/testsuite/gcc.dg/20030826-2.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fomit-frame-pointer" } */
   3 /* { dg-options "-O2 -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   4
   5 extern void abort (void);
   6 extern void exit (int);
   7
   8 struct S
   9 {
  10   int *a;
  11   unsigned char *b, c;
  12 };
  13
  14 int u, v, w;
  15
  16 void
  17 foo (unsigned short x)
  18 {
  19   u += x;
  20 }
  21
  22 int
  23 bar (struct S **x, int *y)
  24 {
  25   w += *y;
  26   *y = w + 25;
  27   return 0;
  28 }
  29
  30 int
  31 baz (struct S **x)
  32 {
  33   struct S *y = *x;
  34   unsigned char *a = y->b;
  35
  36   foo (*a);
  37
  38   if (__builtin_expect (y->c != 0 || y->a == &v, 0))
  39     return 1;
  40
  41   if (__builtin_expect (*a == 1, 0))
  42     {
  43       int a, b = bar (x, &a);
  44
  45       if (a)
  46         return b;
  47     }
  48
  49   return 0;
  50 }
  51
  52 int
  53 main (void)
  54 {
  55   struct S a, *b = &a;
  56   unsigned char c;
  57
  58   __builtin_memset (b, 0, sizeof (a));
  59   a.a = &v;
  60   a.b = &c;
  61   if (baz (&b) != 1)
  62     abort ();
  63   exit (0);
  64 }