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      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 }
     87