gcc/testsuite/gcc.dg/20040609-1.c

   1 /* PRs target/15569, rtl-optimization/15681 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Os -frename-registers" } */
   4 /* { dg-options "-mconstant-gp -Os -frename-registers" { target ia64-*-* } } */
   5
   6 struct S { struct S *a, *b; };
   7 struct T { struct S e; unsigned long a; int b, c; void *d; } f;
   8
   9 unsigned long f1 (unsigned long);
  10 void f2 (int, struct T *);
  11 void *f3 (void *);
  12 unsigned long volatile g;
  13
  14 static void
  15 f4 (struct T *p)
  16 {
  17   f1 (f1 (((unsigned long) g - p->a) >> 20));
  18 }
  19
  20 static struct T *
  21 f5 (void)
  22 {
  23   struct T *g, *p;
  24   struct T *q = 0;
  25   for (g = p = &f; (g = p = (struct T *) (g->e.a)) != &f;)
  26     if (p->b)
  27       {
  28         f4 (p);
  29         if (p->c & 0x80000)
  30           return p;
  31       }
  32   return q;
  33 }
  34
  35 static void
  36 f6 (struct T *p)
  37 {
  38   f2 (9, p);
  39 }
  40
  41 static inline void *
  42 f7 (struct T *t)
  43 {
  44   void *d;
  45   d = t->d;
  46   if (d)
  47     d = f3 (d);
  48   return d;
  49 }
  50
  51 static void *
  52 f8 (struct T *p)
  53 {
  54   void *d = f7 (p);
  55   if (!d)
  56     return 0;
  57   f6 (p);
  58   return d;
  59 }
  60
  61 static void
  62 f9 (void)
  63 {
  64   struct T *p;
  65   p = f5 ();
  66   f8 (p);
  67 }
  68
  69 void
  70 test (void)
  71 {
  72   f9 ();
  73 }