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Annotation of OpenXM_contrib/gmp/mpz/tests/t-powm.c, Revision 1.1

1.1     ! maekawa     1: /* Test mpz_powm, mpz_mul. mpz_mod, mpz_mod_ui, mpz_div_ui.
        !             2:
        !             3: Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include <stdio.h>
        !            23: #include "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25: #include "urandom.h"
        !            26:
        !            27: void debug_mp ();
        !            28:
        !            29: #ifndef SIZE
        !            30: #define SIZE 8
        !            31: #endif
        !            32:
        !            33: main (argc, argv)
        !            34:      int argc;
        !            35:      char **argv;
        !            36: {
        !            37:   mpz_t base, exp, mod;
        !            38:   mpz_t r1, r2, t1, exp2, base2;
        !            39:   mp_size_t base_size, exp_size, mod_size;
        !            40:   int i;
        !            41:   int reps = 10000;
        !            42:
        !            43:   if (argc == 2)
        !            44:      reps = atoi (argv[1]);
        !            45:
        !            46:   mpz_init (base);
        !            47:   mpz_init (exp);
        !            48:   mpz_init (mod);
        !            49:   mpz_init (r1);
        !            50:   mpz_init (r2);
        !            51:   mpz_init (t1);
        !            52:   mpz_init (exp2);
        !            53:   mpz_init (base2);
        !            54:
        !            55:   for (i = 0; i < reps; i++)
        !            56:     {
        !            57:       base_size = urandom () % SIZE - SIZE/2;
        !            58:       mpz_random2 (base, base_size);
        !            59:
        !            60:       exp_size = urandom () % SIZE;
        !            61:       mpz_random2 (exp, exp_size);
        !            62:
        !            63:       mod_size = urandom () % SIZE /* - SIZE/2 */;
        !            64:       mpz_random2 (mod, mod_size);
        !            65:       if (mpz_cmp_ui (mod, 0) == 0)
        !            66:        continue;
        !            67:
        !            68:       /* This is mathematically undefined.  */
        !            69:       if (mpz_cmp_ui (base, 0) == 0 && mpz_cmp_ui (exp, 0) == 0)
        !            70:        continue;
        !            71:
        !            72: #if 0
        !            73:       putc ('\n', stderr);
        !            74:       debug_mp (base, -16);
        !            75:       debug_mp (exp, -16);
        !            76:       debug_mp (mod, -16);
        !            77: #endif
        !            78:
        !            79:       mpz_powm (r1, base, exp, mod);
        !            80:
        !            81:       mpz_set_ui (r2, 1);
        !            82:       mpz_set (base2, base);
        !            83:       mpz_set (exp2, exp);
        !            84:
        !            85:       mpz_mod (r2, r2, mod);   /* needed when exp==0 and mod==1 */
        !            86:       while (mpz_cmp_ui (exp2, 0) != 0)
        !            87:        {
        !            88:          mpz_mod_ui (t1, exp2, 2);
        !            89:          if (mpz_cmp_ui (t1, 0) != 0)
        !            90:            {
        !            91:              mpz_mul (r2, r2, base2);
        !            92:              mpz_mod (r2, r2, mod);
        !            93:            }
        !            94:          mpz_mul (base2, base2, base2);
        !            95:          mpz_mod (base2, base2, mod);
        !            96:          mpz_div_ui (exp2, exp2, 2);
        !            97:        }
        !            98:
        !            99: #if 0
        !           100:       debug_mp (r1, -16);
        !           101:       debug_mp (r2, -16);
        !           102: #endif
        !           103:
        !           104:       if (mpz_cmp (r1, r2) != 0)
        !           105:        abort ();
        !           106:     }
        !           107:
        !           108:   exit (0);
        !           109: }
        !           110:
        !           111: dump_abort (dividend, divisor)
        !           112:      MP_INT *dividend, *divisor;
        !           113: {
        !           114:   fprintf (stderr, "ERROR\n");
        !           115:   fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
        !           116:   fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
        !           117:   abort();
        !           118: }
        !           119:
        !           120: void
        !           121: debug_mp (x, base)
        !           122:      MP_INT *x;
        !           123: {
        !           124:   mpz_out_str (stderr, base, x); fputc ('\n', stderr);
        !           125: }