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 int
  18 main()
  19 {
  20     struct s *pp;
  21     struct s *next;
  22     int i;
  23
  24     p = &ss;
  25     next = p;
  26     for ( i = 0; i < MAX; i++ ) {
  27         next->n = &sss[i];
  28         next = next->n;
  29     }
  30     next->n = 0;
  31
  32     sub( p, &pp );
  33     if (count != MAX+2)
  34       abort ();
  35
  36     return( 0 );
  37 }
  38
  39 void sub( struct s *p, struct s **pp )
  40 {
  41    for ( ; look( p, pp ); ) {
  42         if ( p )
  43             p = p->n;
  44         else
  45             break;
  46    }
  47 }
  48
  49 int look( struct s *p, struct s **pp )
  50 {
  51     for ( ; p; p = p->n )
  52         ;
  53     *pp = p;
  54     count++;
  55     return( 1 );
  56 }
  57
  58 /* { dg-final { scan-tree-dump "Cleaned-up latch block of loop with single BB" "optimized" { xfail { *-*-* } } } } */
  59