OpenXM_contrib/gmp/mpz/gcd_ui.c - diff

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Diff for /OpenXM_contrib/gmp/mpz/Attic/gcd_ui.c between version 1.1 and 1.1.1.3

version 1.1, 2000/01/10 15:35:27

version 1.1.1.3, 2003/08/25 16:06:33

Line 1

/* mpz_gcd_ui -- Calculate the greatest common divisior of two integers.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify

it under the terms of the GNU Library General Public License as published by

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation; either version 2 of the License, or (at your

the Free Software Foundation; either version 2.1 of the License, or (at your

option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public

or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public

License for more details.

You should have received a copy of the GNU Library General Public License

You should have received a copy of the GNU Lesser General Public License

along with the GNU MP Library; see the file COPYING.LIB. If not, write to

the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,

MA 02111-1307, USA. */

#include <stdio.h> /* for NULL */

#include "gmp.h"

#include "gmp-impl.h"

unsigned long int

#if __STDC__

mpz_gcd_ui (mpz_ptr w, mpz_srcptr u, unsigned long int v)

#else

mpz_gcd_ui (w, u, v)

mpz_ptr w;

mpz_srcptr u;

unsigned long int v;

#endif

{

mp_size_t size;

mp_size_t un;

mp_limb_t res;

size = ABS (u->_mp_size);

#if GMP_NAIL_BITS != 0

if (v > GMP_NUMB_MAX)

{

mpz_t vz;

mp_limb_t vlimbs[2];

vlimbs[0] = v & GMP_NUMB_MASK;

vlimbs[1] = v >> GMP_NUMB_BITS;

PTR(vz) = vlimbs;

SIZ(vz) = 2;

mpz_gcd (w, u, vz);

return;

}

#endif

if (size == 0)

un = ABSIZ(u);

if (un == 0)

res = v;

else if (v == 0)

{

if (w != NULL && u != w)

if (w != NULL)

{

if (w->_mp_alloc < size)

if (u != w)

_mpz_realloc (w, size);

{

MPZ_REALLOC (w, un);

MPN_COPY (w->_mp_d, u->_mp_d, size);

MPN_COPY (PTR(w), PTR(u), un);

}

SIZ(w) = un;

}

w->_mp_size = size;

/* We can't return any useful result for gcd(big,0). */

return size > 1 ? 0 : w->_mp_d[0];

return un > 1 ? 0 : PTR(u)[0];

}

else

res = mpn_gcd_1 (u->_mp_d, size, v);

res = mpn_gcd_1 (PTR(u), un, (mp_limb_t) v);

if (w != NULL)

{

w->_mp_d[0] = res;

PTR(w)[0] = res;

w->_mp_size = 1;

SIZ(w) = res != 0;

}

return res;

}

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