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Annotation of OpenXM_contrib/gmp/randlc2x.c, Revision 1.1.1.1

1.1       maekawa     1: /* gmp_randinit_lc_2exp (state, a, c, m2exp) -- Initialize random
                      2:    state STATE for a linear congruential generator with multiplier A,
                      3:    adder C, and modulus 2 ^ M2EXP.
                      4:
                      5: Copyright (C) 2000  Free Software Foundation, Inc.
                      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
                     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
                     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
                     16: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     17: License for more details.
                     18:
                     19: You should have received a copy of the GNU Lesser General Public License
                     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: void
                     28: #if __STDC__
                     29: gmp_randinit_lc_2exp (gmp_randstate_t rstate,
                     30:                      mpz_t a,
                     31:                      unsigned long int c,
                     32:                      unsigned long int m2exp)
                     33: #else
                     34: gmp_randinit_lc_2exp (rstate, a, c, m2exp)
                     35:      gmp_randstate_t rstate;
                     36:      mpz_t a;
                     37:      unsigned long int c;
                     38:      unsigned long int m2exp;
                     39: #endif
                     40: {
                     41:   mpz_init_set_ui (rstate->seed, 1);
                     42:   _mpz_realloc (rstate->seed, m2exp / BITS_PER_MP_LIMB
                     43:                + (m2exp % BITS_PER_MP_LIMB != 0));
                     44:
                     45:   /* Allocate algorithm specific data. */
                     46:   rstate->algdata.lc = (__gmp_randata_lc *)
                     47:     (*_mp_allocate_func) (sizeof (__gmp_randata_lc));
                     48:
                     49:   mpz_init_set (rstate->algdata.lc->a, a);
                     50:   rstate->algdata.lc->c = c;
                     51:
                     52:   /* Cover weird case where m2exp is 0, which means that m is used
                     53:      instead of m2exp.  */
                     54:   if (m2exp == 0)
                     55:     mpz_init_set_ui (rstate->algdata.lc->m, 0);
                     56:   rstate->algdata.lc->m2exp = m2exp;
                     57:
                     58:   rstate->alg = GMP_RAND_ALG_LC;
                     59: }