94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2009 William Hart
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******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "ulong_extras.h"
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void
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fmpz_randtest(fmpz_t f, flint_rand_t state, mp_bitcnt_t bits)
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{
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ulong m;
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fmpz_randtest_unsigned(f, state, bits);
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m = n_randlimb(state);
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if (m & UWORD(1))
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fmpz_neg(f, f);
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}
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void
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fmpz_randtest_unsigned(fmpz_t f, flint_rand_t state, mp_bitcnt_t bits)
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{
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ulong m;
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m = n_randlimb(state);
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bits = n_randint(state, bits + 1);
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if (bits <= FLINT_BITS - 2)
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{
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_fmpz_demote(f);
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if (m & UWORD(3))
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*f = n_randtest_bits(state, bits);
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else
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{
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m >>= 2;
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if (bits == 0)
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*f = 0;
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else if (bits < FLINT_BITS - 2)
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*f = m & UWORD(1);
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else
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*f = COEFF_MAX;
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}
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}
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else
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{
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__mpz_struct *mpz_ptr = _fmpz_promote(f);
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_flint_rand_init_gmp(state);
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mpz_rrandomb(mpz_ptr, state->gmp_state, bits);
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_fmpz_demote_val(f);
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}
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}
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void
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fmpz_randtest_not_zero(fmpz_t f, flint_rand_t state, mp_bitcnt_t bits)
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{
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if (bits == 0)
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{
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flint_printf("Exception (fmpz_randtest_not_zero). bits == 0.\n");
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abort();
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}
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fmpz_randtest(f, state, bits);
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if (fmpz_is_zero(f))
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fmpz_one(f);
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}
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