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4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* mpf_random2 -- 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, 2001-2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP 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 General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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void
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mpf_random2 (mpf_ptr x, 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_random2 (PTR(x), xn);
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/* Generate random exponent. */
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_gmp_rand (&elimb, RANDS, 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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