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Annotation of OpenXM_contrib/gmp/mpf/random2.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpf_random2 -- Generate a positive random mpf_t of specified size, with
                      2:    long runs of consecutive ones and zeros in the binary representation.
                      3:    Intended for testing of other MP routines.
                      4:
1.1.1.3 ! ohara       5: Copyright 1995, 1996, 2001, 2002 Free Software Foundation, Inc.
1.1       maekawa     6:
                      7: This file is part of the GNU MP Library.
                      8:
                      9: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2   maekawa    10: it under the terms of the GNU Lesser General Public License as published by
                     11: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    12: option) any later version.
                     13:
                     14: The GNU MP Library is distributed in the hope that it will be useful, but
                     15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2   maekawa    16: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    17: License for more details.
                     18:
1.1.1.2   maekawa    19: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    20: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     22: MA 02111-1307, USA. */
                     23:
                     24: #include "gmp.h"
                     25: #include "gmp-impl.h"
                     26:
                     27:
                     28: void
                     29: mpf_random2 (mpf_ptr x, mp_size_t size, mp_exp_t exp)
                     30: {
                     31:   mp_size_t asize;
                     32:   mp_size_t prec = x->_mp_prec;
1.1.1.3 ! ohara      33:   mp_limb_t elimb;
1.1       maekawa    34:
                     35:   asize = ABS (size);
                     36:   if (asize != 0)
                     37:     {
                     38:       if (asize > prec + 1)
                     39:        asize = prec + 1;
                     40:
                     41:       mpn_random2 (x->_mp_d, asize);
                     42:     }
                     43:
                     44:   if (exp != 0)
1.1.1.3 ! ohara      45:     {
        !            46:       _gmp_rand (&elimb, RANDS, GMP_NUMB_BITS);
        !            47:       exp = elimb % (2 * exp) - exp;
        !            48:     }
1.1       maekawa    49:   x->_mp_exp = asize == 0 ? 0 : exp;
                     50:   x->_mp_size = size < 0 ? -asize : asize;
                     51: }