74 lines
2.1 KiB
C
74 lines
2.1 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) 2007, 2008 William Hart
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Copyright (C) 2008 Peter Shrimpton
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Copyright (C) 2011 Fredrik Johansson
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******************************************************************************/
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#define ulong ulongxx /* interferes with system includes */
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#include <stdlib.h>
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#include <stdio.h>
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#undef ulong
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#define ulong mp_limb_t
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#include "flint.h"
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#include "ulong_extras.h"
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mp_limb_t n_randprime(flint_rand_t state, ulong bits, int proved)
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{
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mp_limb_t rand;
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if (bits < 2)
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{
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flint_printf("Exception in n_randprime: attempt to generate prime < 2!\n");
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abort();
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}
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if (bits == FLINT_BITS)
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{
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do { rand = n_randbits(state, bits); }
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while (rand >= UWORD_MAX_PRIME);
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rand = n_nextprime(rand, proved);
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}
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else if (bits == 2)
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{
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rand = 2 + n_randint(state, 2);
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}
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else
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{
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do
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{
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rand = n_randbits(state, bits);
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rand = n_nextprime(rand, proved);
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} while ((rand >> bits) > WORD(0));
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}
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return rand;
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}
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mp_limb_t n_randtest_prime(flint_rand_t state, int proved)
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{
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return n_randprime(state, 2 + n_randint(state, FLINT_BITS - 1), proved);
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}
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