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

82 lines
2.2 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) 2011 Fredrik Johansson
******************************************************************************/
#include "fmpq.h"
void
_fmpq_randtest(fmpz_t num, fmpz_t den, flint_rand_t state, mp_bitcnt_t bits)
{
mp_limb_t x = n_randlimb(state);
fmpz_randtest(num, state, bits);
fmpz_randtest_not_zero(den, state, bits);
switch (x % 16)
{
case 0:
fmpz_set_si(num, 1);
break;
case 1:
fmpz_set_si(num, -1);
break;
case 2:
fmpz_set_si(num, 2);
break;
case 3:
fmpz_set_si(num, -2);
break;
}
switch ((x / 16) % 16)
{
case 0:
fmpz_set_si(den, 1);
break;
case 2:
fmpz_set_si(den, 2);
break;
}
_fmpq_canonicalise(num, den);
}
void fmpq_randtest(fmpq_t res, flint_rand_t state, mp_bitcnt_t bits)
{
_fmpq_randtest(fmpq_numref(res), fmpq_denref(res), state, bits);
}
void fmpq_randtest_not_zero(fmpq_t f, flint_rand_t state, mp_bitcnt_t bits)
{
if (bits == 0)
{
flint_printf("Exception (fmpq_randtest_not_zero). bits == 0.\n");
abort();
}
do {
fmpq_randtest(f, state, bits);
} while (fmpq_is_zero(f));
}