Annotation of OpenXM/src/kan96xx/gmp-2.0.2-ssh-2/mpz/hamdist.c, Revision 1.1.1.1
1.1 takayama 1: /* mpz_hamdist(mpz_ptr op1, mpz_ptr op2) -- Compute the hamming distance
2: between OP1 and OP2. If one of the operands is negative, return ~0. (We
3: could make the function well-defined when both operands are negative, but
4: that would probably not be worth the trouble.
5:
6: Copyright (C) 1994, 1996 Free Software Foundation, Inc.
7:
8: This file is part of the GNU MP Library.
9:
10: The GNU MP Library is free software; you can redistribute it and/or modify
11: it under the terms of the GNU Library General Public License as published by
12: the Free Software Foundation; either version 2 of the License, or (at your
13: option) any later version.
14:
15: The GNU MP Library is distributed in the hope that it will be useful, but
16: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
18: License for more details.
19:
20: You should have received a copy of the GNU Library General Public License
21: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
22: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
23: MA 02111-1307, USA. */
24:
25: #include "gmp.h"
26: #include "gmp-impl.h"
27:
28: unsigned long int
29: #if __STDC__
30: mpz_hamdist (mpz_srcptr u, mpz_srcptr v)
31: #else
32: mpz_hamdist (u, v)
33: mpz_srcptr u;
34: mpz_srcptr v;
35: #endif
36: {
37: mp_srcptr up, vp;
38: mp_size_t usize, vsize, size;
39: unsigned long int count;
40:
41: usize = u->_mp_size;
42: vsize = v->_mp_size;
43:
44: if ((usize | vsize) < 0)
45: return ~ (unsigned long int) 0;
46:
47: up = u->_mp_d;
48: vp = v->_mp_d;
49:
50: if (usize > vsize)
51: {
52: count = mpn_popcount (up + vsize, usize - vsize);
53: size = vsize;
54: }
55: else
56: {
57: count = mpn_popcount (vp + usize, vsize - usize);
58: size = usize;
59: }
60:
61: return count + mpn_hamdist (up, vp, size);
62: }
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