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-*-* && ilp32 } } } */
   4 /* { dg-options "-O2 -fomit-frame-pointer -march=i386" { target { x86_64-*-* && ilp32 } } } */
   5
   6 extern void abort (void);
   7 extern void exit (int);
   8
   9 struct S
  10 {
  11   int *a;
  12   unsigned char *b, c;
  13 };
  14
  15 int u, v, w;
  16
  17 void
  18 foo (unsigned short x)
  19 {
  20   u += x;
  21 }
  22
  23 int
  24 bar (struct S **x, int *y)
  25 {
  26   w += *y;
  27   *y = w + 25;
  28   return 0;
  29 }
  30
  31 int
  32 baz (struct S **x)
  33 {
  34   struct S *y = *x;
  35   unsigned char *a = y->b;
  36
  37   foo (*a);
  38
  39   if (__builtin_expect (y->c != 0 || y->a == &v, 0))
  40     return 1;
  41
  42   if (__builtin_expect (*a == 1, 0))
  43     {
  44       int a, b = bar (x, &a);
  45
  46       if (a)
  47         return b;
  48     }
  49
  50   return 0;
  51 }
  52
  53 int
  54 main (void)
  55 {
  56   struct S a, *b = &a;
  57   unsigned char c;
  58
  59   __builtin_memset (b, 0, sizeof (a));
  60   a.a = &v;
  61   a.b = &c;
  62   if (baz (&b) != 1)
  63     abort ();
  64   exit (0);
  65 }