pqc/external/flint-2.4.3/fmpq_poly/randtest.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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 William Hart
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpq_poly.h"
#include "ulong_extras.h"
void fmpq_poly_randtest(fmpq_poly_t poly, flint_rand_t state,
slong len, mp_bitcnt_t bits)
{
ulong m;
m = n_randlimb(state);
fmpq_poly_fit_length(poly, len);
_fmpq_poly_set_length(poly, len);
if (m & UWORD(1))
{
_fmpz_vec_randtest(poly->coeffs, state, len, bits);
}
else
{
fmpz_t x;
fmpz_init(x);
fmpz_randtest(x, state, bits / 2);
_fmpz_vec_randtest(poly->coeffs, state, len, (bits + 1) / 2);
_fmpz_vec_scalar_mul_fmpz(poly->coeffs, poly->coeffs, len, x);
fmpz_clear(x);
}
if (m & UWORD(2))
{
fmpz_randtest_not_zero(poly->den, state, FLINT_MAX(bits, 1));
fmpz_abs(poly->den, poly->den);
fmpq_poly_canonicalise(poly);
}
else
{
fmpz_one(poly->den);
_fmpq_poly_normalise(poly);
}
}
void fmpq_poly_randtest_unsigned(fmpq_poly_t poly, flint_rand_t state,
slong len, mp_bitcnt_t bits)
{
ulong m;
m = n_randlimb(state);
fmpq_poly_fit_length(poly, len);
_fmpq_poly_set_length(poly, len);
if (m & UWORD(1))
{
_fmpz_vec_randtest_unsigned(poly->coeffs, state, len, bits);
}
else
{
fmpz_t x;
fmpz_init(x);
fmpz_randtest_unsigned(x, state, bits / 2);
_fmpz_vec_randtest_unsigned(poly->coeffs, state, len, (bits + 1) / 2);
_fmpz_vec_scalar_mul_fmpz(poly->coeffs, poly->coeffs, len, x);
fmpz_clear(x);
}
if (m & UWORD(2))
{
fmpz_randtest_not_zero(poly->den, state, FLINT_MAX(bits, 1));
fmpz_abs(poly->den, poly->den);
fmpq_poly_canonicalise(poly);
}
else
{
fmpz_one(poly->den);
_fmpq_poly_normalise(poly);
}
}
void fmpq_poly_randtest_not_zero(fmpq_poly_t f, flint_rand_t state,
slong len, mp_bitcnt_t bits)
{
if ((bits == 0) | (len == 0))
{
flint_printf("Exception (fmpq_poly_randtest_not_zeo). bits == 0.\n");
abort();
}
fmpq_poly_randtest(f, state, len, bits);
if (f->length == 0)
fmpq_poly_set_ui(f, 1);
}