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Update to new divegcd from GMP 5.1.3.

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This commit is contained in:
William Hart 2014-02-28 16:57:25 +00:00
parent 8e3504e372
commit 77542fb62b
1 changed files with 78 additions and 44 deletions
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122
mpz/divegcd.c
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@ -3,13 +3,13 @@
THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE AND ARE ALMOST CERTAIN TO
BE SUBJECT TO INCOMPATIBLE CHANGES IN FUTURE GNU MP RELEASES.
Copyright 2000, 2005 Free Software Foundation, Inc.
Copyright 2000, 2005, 2011, 2012 Free Software Foundation, Inc.
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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
the Free Software Foundation; either version 3 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
@ -18,11 +18,9 @@ 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 Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include "mpir.h"
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
@ -46,28 +44,53 @@ MA 02110-1301, USA. */
implementation. */
#if GMP_NUMB_BITS % 2 == 0
static void
mpz_divexact_by3 (mpz_ptr q, mpz_srcptr a)
{
mp_size_t size = SIZ(a);
if (size == 0)
{
SIZ(q) = 0;
return;
}
else
{
mp_size_t abs_size = ABS(size);
mp_ptr qp;
mp_size_t abs_size = ABS(size);
mp_ptr qp;
MPZ_REALLOC (q, abs_size);
qp = MPZ_REALLOC (q, abs_size);
qp = PTR(q);
mpn_divexact_by3 (qp, PTR(a), abs_size);
mpn_divexact_byfobm1 (qp, PTR(a), abs_size, 3, GMP_NUMB_MASK / 3);
abs_size -= (qp[abs_size-1] == 0);
SIZ(q) = (size>0 ? abs_size : -abs_size);
}
abs_size -= (qp[abs_size-1] == 0);
SIZ(q) = (size>0 ? abs_size : -abs_size);
}
#endif
#if GMP_NUMB_BITS % 4 == 0
static void
mpz_divexact_by5 (mpz_ptr q, mpz_srcptr a)
{
mp_size_t size = SIZ(a);
mp_size_t abs_size = ABS(size);
mp_ptr qp;
qp = MPZ_REALLOC (q, abs_size);
mpn_divexact_byfobm1 (qp, PTR(a), abs_size, 5, GMP_NUMB_MASK / 5);
abs_size -= (qp[abs_size-1] == 0);
SIZ(q) = (size>0 ? abs_size : -abs_size);
}
#endif
static void
mpz_divexact_limb (mpz_ptr q, mpz_srcptr a, mp_limb_t d)
{
mp_size_t size = SIZ(a);
mp_size_t abs_size = ABS(size);
mp_ptr qp;
qp = MPZ_REALLOC (q, abs_size);
mpn_divexact_1 (qp, PTR(a), abs_size, d);
abs_size -= (qp[abs_size-1] == 0);
SIZ(q) = (size>0 ? abs_size : -abs_size);
}
void
@ -75,37 +98,48 @@ mpz_divexact_gcd (mpz_ptr q, mpz_srcptr a, mpz_srcptr d)
{
ASSERT (mpz_sgn (d) > 0);
if (SIZ(a) == 0)
{
SIZ(q) = 0;
return;
}
if (SIZ(d) == 1)
{
mp_limb_t dl = PTR(d)[0];
int twos;
if (dl == 1)
{
if (q != a)
mpz_set (q, a);
return;
}
if (dl == 3)
{
mpz_divexact_by3 (q, a);
return;
}
count_trailing_zeros (twos, dl);
dl >>= twos;
if ((dl & 1) == 0)
{
count_trailing_zeros (twos, dl);
dl >>= twos;
mpz_tdiv_q_2exp (q, a, twos);
a = q;
}
if (dl == 1)
{
mpz_tdiv_q_2exp (q, a, twos);
return;
}
{
if (q != a)
mpz_set (q, a);
return;
}
#if GMP_NUMB_BITS % 2 == 0
if (dl == 3)
{
mpz_tdiv_q_2exp (q, a, twos);
mpz_divexact_by3 (q, q);
return;
}
{
mpz_divexact_by3 (q, a);
return;
}
#endif
#if GMP_NUMB_BITS % 4 == 0
if (dl == 5)
{
mpz_divexact_by5 (q, a);
return;
}
#endif
mpz_divexact_limb (q, a, dl);
return;
}
mpz_divexact (q, a, d);