61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* mpf_rrandomb -- Generate a positive random mpf_t of specified size, with
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long runs of consecutive ones and zeros in the binary representation.
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Intended for testing of other MP routines.
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Copyright 1995, 1996, 2001, 2002, 2003 Free Software Foundation, Inc.
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Copyright 2009 Jason Moxham
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This file is part of the MPIR Library.
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The MPIR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or (at
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your option) any later version.
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The MPIR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the MPIR Library; see the file COPYING.LIB. If not, write
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to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "mpir.h"
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#include "gmp-impl.h"
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void
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mpf_rrandomb (mpf_ptr x, gmp_randstate_t rnd,mp_size_t xs, mp_exp_t exp)
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{
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mp_size_t xn;
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mp_size_t prec;
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mp_limb_t elimb;
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xn = ABS (xs);
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prec = PREC(x);
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if (xn == 0)
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{
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EXP(x) = 0;
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SIZ(x) = 0;
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return;
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}
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if (xn > prec + 1)
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xn = prec + 1;
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/* General random mantissa. */
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mpn_rrandom (PTR(x), rnd, xn);
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/* Generate random exponent. */
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_gmp_rand (&elimb, rnd, GMP_NUMB_BITS);
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exp = ABS (exp);
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exp = elimb % (2 * exp + 1) - exp;
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EXP(x) = exp;
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SIZ(x) = xs < 0 ? -xn : xn;
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}
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