version 1.1, 2000/01/10 15:35:27 |
version 1.1.1.3, 2003/08/25 16:06:33 |
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/* mpz/gcd.c: Calculate the greatest common divisor of two integers. |
/* mpz/gcd.c: Calculate the greatest common divisor of two integers. |
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc. |
Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2002 Free Software Foundation, |
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Inc. |
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This file is part of the GNU MP Library. |
This file is part of the GNU MP Library. |
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The GNU MP Library is free software; you can redistribute it and/or modify |
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. |
option) any later version. |
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The GNU MP Library is distributed in the hope that it will be useful, but |
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 |
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. |
License for more details. |
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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 |
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, |
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
MA 02111-1307, USA. */ |
MA 02111-1307, USA. */ |
Line 22 MA 02111-1307, USA. */ |
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Line 23 MA 02111-1307, USA. */ |
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#include "gmp.h" |
#include "gmp.h" |
#include "gmp-impl.h" |
#include "gmp-impl.h" |
#include "longlong.h" |
#include "longlong.h" |
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#ifdef BERKELEY_MP |
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#include "mp.h" |
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#endif |
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void *_mpz_realloc (); |
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#ifndef BERKELEY_MP |
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void |
void |
#if __STDC__ |
#ifndef BERKELEY_MP |
mpz_gcd (mpz_ptr g, mpz_srcptr u, mpz_srcptr v) |
mpz_gcd (mpz_ptr g, mpz_srcptr u, mpz_srcptr v) |
#else |
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mpz_gcd (g, u, v) |
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mpz_ptr g; |
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mpz_srcptr u; |
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mpz_srcptr v; |
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#endif |
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#else /* BERKELEY_MP */ |
#else /* BERKELEY_MP */ |
void |
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#if __STDC__ |
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gcd (mpz_srcptr u, mpz_srcptr v, mpz_ptr g) |
gcd (mpz_srcptr u, mpz_srcptr v, mpz_ptr g) |
#else |
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gcd (u, v, g) |
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mpz_ptr g; |
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mpz_srcptr u; |
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mpz_srcptr v; |
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#endif |
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#endif /* BERKELEY_MP */ |
#endif /* BERKELEY_MP */ |
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{ |
{ |
unsigned long int g_zero_bits, u_zero_bits, v_zero_bits; |
unsigned long int g_zero_bits, u_zero_bits, v_zero_bits; |
mp_size_t g_zero_limbs, u_zero_limbs, v_zero_limbs; |
mp_size_t g_zero_limbs, u_zero_limbs, v_zero_limbs; |
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g_zero_bits = MIN (u_zero_bits, v_zero_bits); |
g_zero_bits = MIN (u_zero_bits, v_zero_bits); |
} |
} |
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/* Call mpn_gcd. The 1st argument must not have more bits than the 2nd. */ |
/* Call mpn_gcd. The 2nd argument must not have more bits than the 1st. */ |
vsize = (usize < vsize || (usize == vsize && up[usize-1] < vp[vsize-1])) |
vsize = (usize < vsize || (usize == vsize && up[usize-1] < vp[vsize-1])) |
? mpn_gcd (vp, up, usize, vp, vsize) |
? mpn_gcd (vp, vp, vsize, up, usize) |
: mpn_gcd (vp, vp, vsize, up, usize); |
: mpn_gcd (vp, up, usize, vp, vsize); |
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/* Here G <-- V << (g_zero_limbs*BITS_PER_MP_LIMB + g_zero_bits). */ |
/* Here G <-- V << (g_zero_limbs*BITS_PER_MP_LIMB + g_zero_bits). */ |
gsize = vsize + g_zero_limbs; |
gsize = vsize + g_zero_limbs; |
if (g_zero_bits != 0) |
if (g_zero_bits != 0) |
{ |
{ |
mp_limb_t cy_limb; |
mp_limb_t cy_limb; |
gsize += (vp[vsize - 1] >> (BITS_PER_MP_LIMB - g_zero_bits)) != 0; |
gsize += (vp[vsize - 1] >> (GMP_NUMB_BITS - g_zero_bits)) != 0; |
if (g->_mp_alloc < gsize) |
if (g->_mp_alloc < gsize) |
_mpz_realloc (g, gsize); |
_mpz_realloc (g, gsize); |
MPN_ZERO (g->_mp_d, g_zero_limbs); |
MPN_ZERO (g->_mp_d, g_zero_limbs); |