gcc/testsuite/gcc.dg/torture/pr109585.c

   1 /* { dg-do run } */
   2
   3 #include <stdlib.h>
   4
   5 struct P {
   6     long v;
   7     struct P *n;
   8 };
   9
  10 struct F {
  11     long x;
  12     struct P fam[];
  13 };
  14
  15 int __attribute__((noipa))
  16 f(struct F *f, int i)
  17 {
  18   struct P *p = f->fam;
  19   asm("" : "+r"(f): "r"(p));
  20   p->v = 0;
  21   p->n = 0;
  22   return f->fam->n != 0;
  23 }
  24
  25 int
  26 main()
  27 {
  28   struct F *m = malloc (sizeof (long) + 2 * sizeof (struct P));
  29   m->fam[0].n = &m->fam[1];
  30   if (f (m, 0))
  31     abort ();
  32   return 0;
  33 }