1/* Test mpz_hamdist.
2
3Copyright 2001, 2002 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library test suite.
6
7The GNU MP Library test suite is free software; you can redistribute it
8and/or modify it under the terms of the GNU General Public License as
9published by the Free Software Foundation; either version 3 of the License,
10or (at your option) any later version.
11
12The GNU MP Library test suite is distributed in the hope that it will be
13useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
15Public License for more details.
16
17You should have received a copy of the GNU General Public License along with
18the 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 "tests.h"
24
25
26void
27check_twobits (void)
28{
29  unsigned long  i, j, got, want;
30  mpz_t  x, y;
31
32  mpz_init (x);
33  mpz_init (y);
34  for (i = 0; i < 5 * GMP_NUMB_BITS; i++)
35    {
36      for (j = 0; j < 5 * GMP_NUMB_BITS; j++)
37        {
38          mpz_set_ui (x, 0L);
39          mpz_setbit (x, i);
40          mpz_set_ui (y, 0L);
41          mpz_setbit (y, j);
42
43          want = 2 * (i != j);
44          got = mpz_hamdist (x, y);
45          if (got != want)
46            {
47              printf    ("mpz_hamdist wrong on 2 bits pos/pos\n");
48            wrong:
49              printf    ("  i    %lu\n", i);
50              printf    ("  j    %lu\n", j);
51              printf    ("  got  %lu\n", got);
52              printf    ("  want %lu\n", want);
53              mpz_trace ("  x   ", x);
54              mpz_trace ("  y   ", y);
55              abort();
56            }
57
58          mpz_neg (x, x);
59          mpz_neg (y, y);
60          want = ABS ((long) (i-j));
61          got = mpz_hamdist (x, y);
62          if (got != want)
63            {
64              printf    ("mpz_hamdist wrong on 2 bits neg/neg\n");
65              goto wrong;
66            }
67        }
68
69    }
70  mpz_clear (x);
71  mpz_clear (y);
72}
73
74
75void
76check_rand (void)
77{
78  gmp_randstate_ptr  rands = RANDS;
79  unsigned long  got, want;
80  int    i;
81  mpz_t  x, y;
82
83  mpz_init (x);
84  mpz_init (y);
85
86  for (i = 0; i < 2000; i++)
87    {
88      mpz_erandomb (x, rands, 6 * GMP_NUMB_BITS);
89      mpz_negrandom (x, rands);
90      mpz_mul_2exp (x, x, urandom() % (4 * GMP_NUMB_BITS));
91
92      mpz_erandomb (y, rands, 6 * GMP_NUMB_BITS);
93      mpz_negrandom (y, rands);
94      mpz_mul_2exp (y, y, urandom() % (4 * GMP_NUMB_BITS));
95
96      want = refmpz_hamdist (x, y);
97      got = mpz_hamdist (x, y);
98      if (got != want)
99        {
100          printf    ("mpz_hamdist wrong on random\n");
101          printf    ("  got  %lu\n", got);
102          printf    ("  want %lu\n", want);
103          mpz_trace ("  x   ", x);
104          mpz_trace ("  y   ", y);
105          abort();
106        }
107    }
108  mpz_clear (x);
109  mpz_clear (y);
110}
111
112int
113main (void)
114{
115  tests_start ();
116  mp_trace_base = -16;
117
118  check_twobits ();
119  check_rand ();
120
121  tests_end ();
122  exit (0);
123}
124