gcc/testsuite/gcc.dg/pr34263.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3 /* Same test as 990128-1.c.  */
   4
   5 extern int printf (const char *,...);
   6 extern void abort (void);
   7
   8 struct s { struct s *n; } *p;
   9 struct s ss;
  10 #define MAX     10
  11 struct s sss[MAX];
  12 int count = 0;
  13
  14 void sub( struct s *p, struct s **pp );
  15 int look( struct s *p, struct s **pp );
  16
  17 main()
  18 {
  19     struct s *pp;
  20     struct s *next;
  21     int i;
  22
  23     p = &ss;
  24     next = p;
  25     for ( i = 0; i < MAX; i++ ) {
  26         next->n = &sss[i];
  27         next = next->n;
  28     }
  29     next->n = 0;
  30
  31     sub( p, &pp );
  32     if (count != MAX+2)
  33       abort ();
  34
  35     return( 0 );
  36 }
  37
  38 void sub( struct s *p, struct s **pp )
  39 {
  40    for ( ; look( p, pp ); ) {
  41         if ( p )
  42             p = p->n;
  43         else
  44             break;
  45    }
  46 }
  47
  48 int look( struct s *p, struct s **pp )
  49 {
  50     for ( ; p; p = p->n )
  51         ;
  52     *pp = p;
  53     count++;
  54     return( 1 );
  55 }
  56
  57 /* { dg-final { scan-tree-dump "Cleaned-up latch block of loop with single BB" "optimized" { xfail { *-*-* } } } } */
  58 /* { dg-final { cleanup-tree-dump "optimized" } } */
  59