|
Packit |
5c3484 |
/* mpz_divexact -- finds quotient when known that quot * den == num && den != 0.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
Contributed to the GNU project by Niels Möller.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
Copyright 1991, 1993-1998, 2000-2002, 2005-2007, 2009, 2012 Free Software
|
|
Packit |
5c3484 |
Foundation, Inc.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
This file is part of the GNU MP Library.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
Packit |
5c3484 |
it under the terms of either:
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
* the GNU Lesser General Public License as published by the Free
|
|
Packit |
5c3484 |
Software Foundation; either version 3 of the License, or (at your
|
|
Packit |
5c3484 |
option) any later version.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
or
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
* the GNU General Public License as published by the Free Software
|
|
Packit |
5c3484 |
Foundation; either version 2 of the License, or (at your option) any
|
|
Packit |
5c3484 |
later version.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
or both in parallel, as here.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
The GNU MP Library is distributed in the hope that it will be useful, but
|
|
Packit |
5c3484 |
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
Packit |
5c3484 |
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
Packit |
5c3484 |
for more details.
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
You should have received copies of the GNU General Public License and the
|
|
Packit |
5c3484 |
GNU Lesser General Public License along with the GNU MP Library. If not,
|
|
Packit |
5c3484 |
see https://www.gnu.org/licenses/. */
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
#include "gmp.h"
|
|
Packit |
5c3484 |
#include "gmp-impl.h"
|
|
Packit |
5c3484 |
#include "longlong.h"
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
void
|
|
Packit |
5c3484 |
mpz_divexact (mpz_ptr quot, mpz_srcptr num, mpz_srcptr den)
|
|
Packit |
5c3484 |
{
|
|
Packit |
5c3484 |
mp_ptr qp;
|
|
Packit |
5c3484 |
mp_size_t qn;
|
|
Packit |
5c3484 |
mp_srcptr np, dp;
|
|
Packit |
5c3484 |
mp_size_t nn, dn;
|
|
Packit |
5c3484 |
TMP_DECL;
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
#if WANT_ASSERT
|
|
Packit |
5c3484 |
{
|
|
Packit |
5c3484 |
mpz_t rem;
|
|
Packit |
5c3484 |
mpz_init (rem);
|
|
Packit |
5c3484 |
mpz_tdiv_r (rem, num, den);
|
|
Packit |
5c3484 |
ASSERT (SIZ(rem) == 0);
|
|
Packit |
5c3484 |
mpz_clear (rem);
|
|
Packit |
5c3484 |
}
|
|
Packit |
5c3484 |
#endif
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
nn = ABSIZ (num);
|
|
Packit |
5c3484 |
dn = ABSIZ (den);
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
if (nn < dn)
|
|
Packit |
5c3484 |
{
|
|
Packit |
5c3484 |
/* This special case avoids segfaults below when the function is
|
|
Packit |
5c3484 |
incorrectly called with |N| < |D|, N != 0. It also handles the
|
|
Packit |
5c3484 |
well-defined case N = 0. */
|
|
Packit |
5c3484 |
SIZ(quot) = 0;
|
|
Packit |
5c3484 |
return;
|
|
Packit |
5c3484 |
}
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
qn = nn - dn + 1;
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
TMP_MARK;
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
if (quot == num || quot == den)
|
|
Packit |
5c3484 |
qp = TMP_ALLOC_LIMBS (qn);
|
|
Packit |
5c3484 |
else
|
|
Packit |
5c3484 |
qp = MPZ_REALLOC (quot, qn);
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
np = PTR(num);
|
|
Packit |
5c3484 |
dp = PTR(den);
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
mpn_divexact (qp, np, nn, dp, dn);
|
|
Packit |
5c3484 |
MPN_NORMALIZE (qp, qn);
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
if (qp != PTR(quot))
|
|
Packit |
5c3484 |
MPN_COPY (MPZ_REALLOC (quot, qn), qp, qn);
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
SIZ(quot) = (SIZ(num) ^ SIZ(den)) >= 0 ? qn : -qn;
|
|
Packit |
5c3484 |
|
|
Packit |
5c3484 |
TMP_FREE;
|
|
Packit |
5c3484 |
}
|