Annotation of OpenXM/src/kan96xx/gmp-2.0.2-ssh-2/mpz/hamdist.c, Revision 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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