gcc/testsuite/gcc.dg/torture/pr39074.c

   1 /* { dg-do run } */
   2 /* { dg-options "-fdump-tree-alias" } */
   3 /* { dg-skip-if "" { *-*-* } { "-O0" "-fno-fat-lto-objects" } { "" } } */
   4
   5 typedef __INTPTR_TYPE__ intptr_t;
   6
   7 int i;
   8 void __attribute__((noinline))
   9 foo(long b, intptr_t q)
  10 {
  11   int *y;
  12   int **a = &y, **x;
  13   int ***p;
  14   if (b)
  15     p = (int ***)q;
  16   else
  17     p = &a;
  18   x = *p;
  19   *x = &i;  /* *ANYTHING = &i has to make sure that y points to i.  */
  20   *y = 0;
  21 }
  22 extern void abort (void);
  23 int main()
  24 {
  25   i = 1;
  26   foo (0, 0);
  27   if (i != 0)
  28     abort ();
  29   return 0;
  30 }
  31
  32 /* { dg-final { scan-tree-dump "y.._. = { i }" "alias" } } */
  33 /* { dg-final { scan-tree-dump "y.._., points-to NULL, points-to vars: { D..... }" "alias" } } */