1  /* { dg-do compile } */ 
       2  /* { dg-options "-O2 -fdelete-null-pointer-checks -fisolate-erroneous-paths-attribute -fdump-tree-isolate-paths -fdump-tree-ccp3" } */
       3  /* { dg-skip-if "" keeps_null_pointer_checks } */
       4  
       5  
       6  extern void foo(void *) __attribute__ ((__nonnull__ (1)));
       7  
       8  int z;
       9  
      10  void
      11  com (int a)
      12  {
      13      foo (a == 42 ? &z  : (void *) 0);
      14  }
      15  
      16  void
      17  bar (void)
      18  {
      19    foo ((void *)0);
      20  }
      21  
      22  /* We testing that the path isolation code can take advantage of the
      23     returns non-null attribute to isolate a path where NULL flows into
      24     a return statement.
      25  
      26     We also verify that after isolation phi-cprop simplifies the
      27     return statement so that it returns &z directly. */
      28  /* { dg-final { scan-tree-dump-times "__builtin_trap" 2 "isolate-paths"} } */
      29  /* { dg-final { scan-tree-dump-times "foo .&z.;" 1 "ccp3"} } */
      30  
      31