1  /* Test count_leading_zeros and count_trailing_zeros.
       2  
       3  Copyright 2001-2003 Free Software Foundation, Inc.
       4  
       5  This file is part of the GNU MP Library test suite.
       6  
       7  The GNU MP Library test suite is free software; you can redistribute it
       8  and/or modify it under the terms of the GNU General Public License as
       9  published by the Free Software Foundation; either version 3 of the License,
      10  or (at your option) any later version.
      11  
      12  The GNU MP Library test suite is distributed in the hope that it will be
      13  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
      14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
      15  Public License for more details.
      16  
      17  You should have received a copy of the GNU General Public License along with
      18  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
      19  
      20  #include <stdio.h>
      21  #include <stdlib.h>
      22  #include "gmp-impl.h"
      23  #include "longlong.h"
      24  #include "tests.h"
      25  
      26  void
      27  check_clz (int want, mp_limb_t n)
      28  {
      29    int  got;
      30    count_leading_zeros (got, n);
      31    if (got != want)
      32      {
      33        printf        ("count_leading_zeros wrong\n");
      34        mp_limb_trace ("  n    ", n);
      35        printf        ("  want %d\n", want);
      36        printf        ("  got  %d\n", got);
      37        abort ();
      38      }
      39  }
      40  
      41  void
      42  check_ctz (int want, mp_limb_t n)
      43  {
      44    int  got;
      45    count_trailing_zeros (got, n);
      46    if (got != want)
      47      {
      48        printf ("count_trailing_zeros wrong\n");
      49        mpn_trace ("  n    ", &n, (mp_size_t) 1);
      50        printf    ("  want %d\n", want);
      51        printf    ("  got  %d\n", got);
      52        abort ();
      53      }
      54  }
      55  
      56  void
      57  check_various (void)
      58  {
      59    int        i;
      60  
      61  #ifdef COUNT_LEADING_ZEROS_0
      62    check_clz (COUNT_LEADING_ZEROS_0, CNST_LIMB(0));
      63  #endif
      64  
      65    for (i=0; i < GMP_LIMB_BITS; i++)
      66      {
      67        check_clz (i, CNST_LIMB(1) << (GMP_LIMB_BITS-1-i));
      68        check_ctz (i, CNST_LIMB(1) << i);
      69  
      70        check_ctz (i, MP_LIMB_T_MAX << i);
      71        check_clz (i, MP_LIMB_T_MAX >> i);
      72      }
      73  }
      74  
      75  
      76  int
      77  main (int argc, char *argv[])
      78  {
      79    tests_start ();
      80    mp_trace_base = 16;
      81  
      82    check_various ();
      83  
      84    tests_end ();
      85    exit (0);
      86  }