gcc/testsuite/gcc.dg/torture/pta-ptrarith-2.c

   1 /* { dg-do run } */
   2 /* { dg-options "-fdump-tree-alias" } */
   3 /* { dg-skip-if "" { *-*-* } { "-O0" } { "" } } */
   4
   5 struct Foo {
   6   int **p;
   7   int **q;
   8 };
   9
  10 int __attribute__((noinline))
  11 bar (void)
  12 {
  13   struct Foo f;
  14   int j, i = 1;
  15   char *p;
  16   int *x = &i;
  17   int *y = &j;
  18   f.p = &y;
  19   f.q = &x;
  20   p = (char *)&f;
  21   for (j = 0; j < sizeof (int *); ++j)
  22     p++;
  23   return ***(int ***)p;
  24 }
  25 extern void abort (void);
  26 int main()
  27 {
  28   if (bar () != 1)
  29     abort ();
  30   return 0;
  31 }
  32
  33 /* In theory = { i } is the correct solution.  But it's not easy to scan
  34    for that reliably, so just use what we create now.  */
  35 /* { dg-final { scan-tree-dump "= { i j }" "alias" } } */
  36 /* { dg-final { cleanup-tree-dump "alias" } } */