pqc/external/flint-2.4.3/fmpq_poly/scalar_div_ui.c
2014-05-24 23:16:06 +02:00

82 lines
2.4 KiB
C

/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpq_poly.h"
void _fmpq_poly_scalar_div_ui(fmpz * rpoly, fmpz_t rden, const fmpz * poly,
const fmpz_t den, slong len, ulong c)
{
if (c == UWORD(1))
{
if (rpoly != poly)
_fmpz_vec_set(rpoly, poly, len);
fmpz_set(rden, den);
}
else
{
fmpz_t d, fc;
ulong ud;
fmpz_init(d);
fmpz_init(fc);
_fmpz_vec_content(d, poly, len);
fmpz_set_ui(fc, c);
fmpz_gcd(d, d, fc);
ud = fmpz_get_ui(d); /* gcd of d and c fits into a ulong */
_fmpz_vec_scalar_divexact_ui(rpoly, poly, len, ud);
fmpz_mul_ui(rden, den, c / ud);
fmpz_clear(d);
fmpz_clear(fc);
}
}
void fmpq_poly_scalar_div_ui(fmpq_poly_t rop, const fmpq_poly_t op, ulong c)
{
if (c == UWORD(0))
{
flint_printf("Exception (fmpq_poly_scalar_div_ui). Division by zero.\n");
abort();
}
if (fmpq_poly_is_zero(op))
{
fmpq_poly_zero(rop);
return;
}
fmpq_poly_fit_length(rop, op->length);
_fmpq_poly_set_length(rop, op->length);
_fmpq_poly_scalar_div_ui(rop->coeffs, rop->den,
op->coeffs, op->den, op->length, c);
}