Return to t-fdiv.c CVS log

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

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

1.1       ohara       1: /* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_fdiv_qr, mpz_fdiv_q,
                      2:    mpz_fdiv_r, mpz_mul.
                      3:
                      4: Copyright 1993, 1994, 1996, 2000, 2001 Free Software 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 dividend, divisor;
                     37:   mpz_t quotient, remainder;
                     38:   mpz_t quotient2, remainder2;
                     39:   mpz_t temp;
                     40:   mp_size_t dividend_size, divisor_size;
                     41:   int i;
                     42:   int reps = 200;
                     43:   gmp_randstate_ptr rands;
                     44:   mpz_t bs;
                     45:   unsigned long bsi, size_range;
                     46:
                     47:   tests_start ();
                     48:   rands = RANDS;
                     49:
                     50:   mpz_init (bs);
                     51:
                     52:   if (argc == 2)
                     53:      reps = atoi (argv[1]);
                     54:
                     55:   mpz_init (dividend);
                     56:   mpz_init (divisor);
                     57:   mpz_init (quotient);
                     58:   mpz_init (remainder);
                     59:   mpz_init (quotient2);
                     60:   mpz_init (remainder2);
                     61:   mpz_init (temp);
                     62:
                     63:   for (i = 0; i < reps; i++)
                     64:     {
                     65:       mpz_urandomb (bs, rands, 32);
                     66:       size_range = mpz_get_ui (bs) % 16 + 2; /* 0..131071 bit operands */
                     67:
                     68:       do
                     69:        {
                     70:          mpz_urandomb (bs, rands, size_range);
                     71:          divisor_size = mpz_get_ui (bs);
                     72:          mpz_rrandomb (divisor, rands, divisor_size);
                     73:        }
                     74:       while (mpz_sgn (divisor) == 0);
                     75:
                     76:       mpz_urandomb (bs, rands, size_range);
                     77:       dividend_size = mpz_get_ui (bs) + divisor_size;
                     78:       mpz_rrandomb (dividend, rands, dividend_size);
                     79:
                     80:       mpz_urandomb (bs, rands, 2);
                     81:       bsi = mpz_get_ui (bs);
                     82:       if ((bsi & 1) != 0)
                     83:        mpz_neg (dividend, dividend);
                     84:       if ((bsi & 2) != 0)
                     85:        mpz_neg (divisor, divisor);
                     86:
                     87:       /* printf ("%ld %ld\n", SIZ (dividend), SIZ (divisor)); */
                     88:
                     89:       mpz_fdiv_qr (quotient, remainder, dividend, divisor);
                     90:       mpz_fdiv_q (quotient2, dividend, divisor);
                     91:       mpz_fdiv_r (remainder2, dividend, divisor);
                     92:
                     93:       /* First determine that the quotients and remainders computed
                     94:         with different functions are equal.  */
                     95:       if (mpz_cmp (quotient, quotient2) != 0)
                     96:        dump_abort (dividend, divisor);
                     97:       if (mpz_cmp (remainder, remainder2) != 0)
                     98:        dump_abort (dividend, divisor);
                     99:
                    100:       /* Check if the sign of the quotient is correct.  */
                    101:       if (mpz_cmp_ui (quotient, 0) != 0)
                    102:        if ((mpz_cmp_ui (quotient, 0) < 0)
                    103:            != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0))
                    104:        dump_abort (dividend, divisor);
                    105:
                    106:       /* Check if the remainder has the same sign as the divisor
                    107:         (quotient rounded towards minus infinity).  */
                    108:       if (mpz_cmp_ui (remainder, 0) != 0)
                    109:        if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (divisor, 0) < 0))
                    110:          dump_abort (dividend, divisor);
                    111:
                    112:       mpz_mul (temp, quotient, divisor);
                    113:       mpz_add (temp, temp, remainder);
                    114:       if (mpz_cmp (temp, dividend) != 0)
                    115:        dump_abort (dividend, divisor);
                    116:
                    117:       mpz_abs (temp, divisor);
                    118:       mpz_abs (remainder, remainder);
                    119:       if (mpz_cmp (remainder, temp) >= 0)
                    120:        dump_abort (dividend, divisor);
                    121:     }
                    122:
                    123:   mpz_clear (bs);
                    124:   mpz_clear (dividend);
                    125:   mpz_clear (divisor);
                    126:   mpz_clear (quotient);
                    127:   mpz_clear (remainder);
                    128:   mpz_clear (quotient2);
                    129:   mpz_clear (remainder2);
                    130:   mpz_clear (temp);
                    131:
                    132:   tests_end ();
                    133:   exit (0);
                    134: }
                    135:
                    136: void
                    137: dump_abort (mpz_t dividend, mpz_t divisor)
                    138: {
                    139:   fprintf (stderr, "ERROR\n");
                    140:   fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
                    141:   fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
                    142:   abort();
                    143: }
                    144:
                    145: void
                    146: debug_mp (mpz_t x, int base)
                    147: {
                    148:   mpz_out_str (stderr, base, x); fputc ('\n', stderr);
                    149: }