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

1.1       ohara       1: /* Test mpz_powm_ui, mpz_mul. mpz_mod.
                      2:
                      3: Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001, 2002 Free Software
                      4: Foundation, Inc.
                      5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Lesser General Public License
                     19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include <stdio.h>
                     24: #include <stdlib.h>
                     25:
                     26: #include "gmp.h"
                     27: #include "gmp-impl.h"
                     28: #include "tests.h"
                     29:
                     30: void dump_abort _PROTO ((mpz_t, mpz_t));
                     31: void debug_mp _PROTO ((mpz_t, int));
                     32:
                     33: int
                     34: main (int argc, char **argv)
                     35: {
                     36:   mpz_t base, exp, mod;
                     37:   mpz_t r1, r2, base2;
                     38:   mp_size_t base_size, exp_size, mod_size;
                     39:   unsigned long int exp2;
                     40:   int i;
                     41:   int reps = 400;
                     42:   gmp_randstate_ptr rands;
                     43:   mpz_t bs;
                     44:   unsigned long bsi, size_range;
                     45:
                     46:   tests_start ();
                     47:   rands = RANDS;
                     48:
                     49:   mpz_init (bs);
                     50:
                     51:   if (argc == 2)
                     52:      reps = atoi (argv[1]);
                     53:
                     54:   mpz_init (base);
                     55:   mpz_init (exp);
                     56:   mpz_init (mod);
                     57:   mpz_init (r1);
                     58:   mpz_init (r2);
                     59:   mpz_init (base2);
                     60:
                     61:   for (i = 0; i < reps; i++)
                     62:     {
                     63:       mpz_urandomb (bs, rands, 32);
                     64:       size_range = mpz_get_ui (bs) % 13 + 2;
                     65:
                     66:       do  /* Loop until mathematically well-defined.  */
                     67:        {
                     68:          mpz_urandomb (bs, rands, size_range);
                     69:          base_size = mpz_get_ui (bs);
                     70:          mpz_rrandomb (base, rands, base_size);
                     71:
                     72:          mpz_urandomb (bs, rands, 6L);
                     73:          exp_size = mpz_get_ui (bs);
                     74:          mpz_rrandomb (exp, rands, exp_size);
                     75:          exp2 = mpz_getlimbn (exp, 0);
                     76:        }
                     77:       while (mpz_cmp_ui (base, 0) == 0 && exp2 == 0);
                     78:
                     79:       do
                     80:         {
                     81:          mpz_urandomb (bs, rands, size_range);
                     82:          mod_size = mpz_get_ui (bs);
                     83:          mpz_rrandomb (mod, rands, mod_size);
                     84:        }
                     85:       while (mpz_cmp_ui (mod, 0) == 0);
                     86:
                     87:       mpz_urandomb (bs, rands, 2);
                     88:       bsi = mpz_get_ui (bs);
                     89:       if ((bsi & 1) != 0)
                     90:        mpz_neg (base, base);
                     91:
                     92:       /* printf ("%ld %ld\n", SIZ (base), SIZ (mod)); */
                     93:
                     94: #if 0
                     95:       putc ('\n', stderr);
                     96:       debug_mp (base, -16);
                     97:       debug_mp (mod, -16);
                     98: #endif
                     99:
                    100:       mpz_powm_ui (r1, base, exp2, mod);
                    101:
                    102:       mpz_set_ui (r2, 1);
                    103:       mpz_set (base2, base);
                    104:
                    105:       mpz_mod (r2, r2, mod);   /* needed when exp==0 and mod==1 */
                    106:       while (exp2 != 0)
                    107:        {
                    108:          if (exp2 % 2 != 0)
                    109:            {
                    110:              mpz_mul (r2, r2, base2);
                    111:              mpz_mod (r2, r2, mod);
                    112:            }
                    113:          mpz_mul (base2, base2, base2);
                    114:          mpz_mod (base2, base2, mod);
                    115:          exp2 = exp2 / 2;
                    116:        }
                    117:
                    118: #if 0
                    119:       debug_mp (r1, -16);
                    120:       debug_mp (r2, -16);
                    121: #endif
                    122:
                    123:       if (mpz_cmp (r1, r2) != 0)
                    124:        {
                    125:          fprintf (stderr, "\ntest %d: Incorrect results for operands:\n", i);
                    126:          debug_mp (base, -16);
                    127:          debug_mp (exp, -16);
                    128:          debug_mp (mod, -16);
                    129:          fprintf (stderr, "mpz_powm result:\n");
                    130:          debug_mp (r1, -16);
                    131:          fprintf (stderr, "reference result:\n");
                    132:          debug_mp (r2, -16);
                    133:          abort ();
                    134:        }
                    135:     }
                    136:
                    137:   mpz_clear (bs);
                    138:   mpz_clear (base);
                    139:   mpz_clear (exp);
                    140:   mpz_clear (mod);
                    141:   mpz_clear (r1);
                    142:   mpz_clear (r2);
                    143:   mpz_clear (base2);
                    144:
                    145:   tests_end ();
                    146:   exit (0);
                    147: }
                    148:
                    149: void
                    150: dump_abort (mpz_t dividend, mpz_t divisor)
                    151: {
                    152:   fprintf (stderr, "ERROR\n");
                    153:   fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
                    154:   fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
                    155:   abort();
                    156: }
                    157:
                    158: void
                    159: debug_mp (mpz_t x, int base)
                    160: {
                    161:   mpz_out_str (stderr, base, x); fputc ('\n', stderr);
                    162: }