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Annotation of OpenXM_contrib/gmp/mpz/tests/t-powm.c, Revision 1.1.1.1

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: }