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Annotation of OpenXM_contrib/gmp/randlc2x.c, Revision 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: }