Return to t-powm_ui.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpz / tests

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

1.1     ! maekawa     1: /* Test mpz_powm_ui, 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, mod;
        !            38:   mpz_t r1, r2, base2;
        !            39:   mp_size_t base_size, mod_size;
        !            40:   mp_limb_t exp, exp2;
        !            41:   int i;
        !            42:   int reps = 10000;
        !            43:
        !            44:   if (argc == 2)
        !            45:      reps = atoi (argv[1]);
        !            46:
        !            47:   mpz_init (base);
        !            48:   mpz_init (mod);
        !            49:   mpz_init (r1);
        !            50:   mpz_init (r2);
        !            51:   mpz_init (base2);
        !            52:
        !            53:   for (i = 0; i < reps; i++)
        !            54:     {
        !            55:       base_size = urandom () % SIZE /* - SIZE/2 */;
        !            56:       mpz_random2 (base, base_size);
        !            57:
        !            58:       mpn_random2 (&exp, 1);
        !            59:
        !            60:       mod_size = urandom () % SIZE /* - SIZE/2 */;
        !            61:       mpz_random2 (mod, mod_size);
        !            62:       if (mpz_cmp_ui (mod, 0) == 0)
        !            63:        continue;
        !            64:
        !            65:       /* This is mathematically undefined.  */
        !            66:       if (mpz_cmp_ui (base, 0) == 0 && exp == 0)
        !            67:        continue;
        !            68:
        !            69: #if 0
        !            70:       putc ('\n', stderr);
        !            71:       debug_mp (base, -16);
        !            72:       debug_mp (mod, -16);
        !            73: #endif
        !            74:
        !            75:       mpz_powm_ui (r1, base, (unsigned long int) exp, mod);
        !            76:
        !            77:       mpz_set_ui (r2, 1);
        !            78:       mpz_set (base2, base);
        !            79:       exp2 = exp;
        !            80:
        !            81:       mpz_mod (r2, r2, mod);   /* needed when exp==0 and mod==1 */
        !            82:       while (exp2 != 0)
        !            83:        {
        !            84:          if (exp2 % 2 != 0)
        !            85:            {
        !            86:              mpz_mul (r2, r2, base2);
        !            87:              mpz_mod (r2, r2, mod);
        !            88:            }
        !            89:          mpz_mul (base2, base2, base2);
        !            90:          mpz_mod (base2, base2, mod);
        !            91:          exp2 = exp2 / 2;
        !            92:        }
        !            93:
        !            94: #if 0
        !            95:       debug_mp (r1, -16);
        !            96:       debug_mp (r2, -16);
        !            97: #endif
        !            98:
        !            99:       if (mpz_cmp (r1, r2) != 0)
        !           100:        abort ();
        !           101:     }
        !           102:
        !           103:   exit (0);
        !           104: }
        !           105:
        !           106: dump_abort (dividend, divisor)
        !           107:      MP_INT *dividend, *divisor;
        !           108: {
        !           109:   fprintf (stderr, "ERROR\n");
        !           110:   fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
        !           111:   fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
        !           112:   abort();
        !           113: }
        !           114:
        !           115: void
        !           116: debug_mp (x, base)
        !           117:      MP_INT *x;
        !           118: {
        !           119:   mpz_out_str (stderr, base, x); fputc ('\n', stderr);
        !           120: }