gcc/testsuite/gcc.target/i386/pr59099.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target fpic } */
   3 /* { dg-options "-O2 -fPIC" } */
   4
   5 void (*pfn)(void);
   6
   7 struct s
   8 {
   9   void** q;
  10   int h;
  11   int t;
  12   int s;
  13 };
  14
  15
  16 void* f (struct s *, struct s *) __attribute__ ((noinline, regparm(1)));
  17
  18 void*
  19 __attribute__ ((regparm(1)))
  20 f (struct s *p, struct s *p2)
  21 {
  22   void *gp, *gp1;
  23   int t, h, s, t2, h2, c, i;
  24
  25   if (p2->h == p2->t)
  26     return 0;
  27
  28   (*pfn) ();
  29
  30   h = p->h;
  31   t = p->t;
  32   s = p->s;
  33
  34   h2 = p2->h;
  35   t2 = p2->t;
  36
  37   gp = p2->q[h2++];
  38
  39   c = (t2 - h2) / 2;
  40   for (i = 0; i != c; i++)
  41     {
  42       if (t == h || (h == 0 && t == s - 1))
  43         break;
  44       gp1 = p2->q[h2++];
  45       p->q[t++] = gp1;
  46       if (t == s)
  47         t = 0;
  48     }
  49
  50   p2->h = h2;
  51   return gp;
  52 }
  53
  54 static void gn () { }
  55
  56 int
  57 main()
  58 {
  59   struct s s1, s2;
  60   void *q[10];
  61
  62   pfn = gn;
  63
  64   s1.q = q;
  65   s1.h = 0;
  66   s1.t = 2;
  67   s1.s = 4;
  68
  69   s2.q = q;
  70   s2.h = 0;
  71   s2.t = 4;
  72   s2.s = 2;
  73
  74   f (&s1, &s2);
  75
  76   return 0;
  77 }