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

1.1       maekawa     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 (C) 1993, 1994, 1996 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 Library General Public License as published by
                     10: the Free Software Foundation; either version 2 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 Library General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Library 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 "gmp.h"
                     25: #include "gmp-impl.h"
                     26: #include "urandom.h"
                     27:
                     28: void debug_mp ();
                     29:
                     30: #ifndef SIZE
                     31: #define SIZE 16
                     32: #endif
                     33:
                     34: main (argc, argv)
                     35:      int argc;
                     36:      char **argv;
                     37: {
                     38:   mpz_t dividend, divisor;
                     39:   mpz_t quotient, remainder;
                     40:   mpz_t quotient2, remainder2;
                     41:   mpz_t temp;
                     42:   mp_size_t dividend_size, divisor_size;
                     43:   int i;
                     44:   int reps = 100000;
                     45:
                     46:   if (argc == 2)
                     47:      reps = atoi (argv[1]);
                     48:
                     49:   mpz_init (dividend);
                     50:   mpz_init (divisor);
                     51:   mpz_init (quotient);
                     52:   mpz_init (remainder);
                     53:   mpz_init (quotient2);
                     54:   mpz_init (remainder2);
                     55:   mpz_init (temp);
                     56:
                     57:   for (i = 0; i < reps; i++)
                     58:     {
                     59:       dividend_size = urandom () % SIZE - SIZE/2;
                     60:       mpz_random2 (dividend, dividend_size);
                     61:
                     62:       divisor_size = urandom () % SIZE - SIZE/2;
                     63:       mpz_random2 (divisor, divisor_size);
                     64:       if (mpz_cmp_ui (divisor, 0) == 0)
                     65:        continue;
                     66:
                     67:       mpz_fdiv_qr (quotient, remainder, dividend, divisor);
                     68:       mpz_fdiv_q (quotient2, dividend, divisor);
                     69:       mpz_fdiv_r (remainder2, dividend, divisor);
                     70:
                     71:       /* First determine that the quotients and remainders computed
                     72:         with different functions are equal.  */
                     73:       if (mpz_cmp (quotient, quotient2) != 0)
                     74:        dump_abort (dividend, divisor);
                     75:       if (mpz_cmp (remainder, remainder2) != 0)
                     76:        dump_abort (dividend, divisor);
                     77:
                     78:       /* Check if the sign of the quotient is correct.  */
                     79:       if (mpz_cmp_ui (quotient, 0) != 0)
                     80:        if ((mpz_cmp_ui (quotient, 0) < 0)
                     81:            != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0))
                     82:        dump_abort (dividend, divisor);
                     83:
                     84:       /* Check if the remainder has the same sign as the divisor
                     85:         (quotient rounded towards minus infinity).  */
                     86:       if (mpz_cmp_ui (remainder, 0) != 0)
                     87:        if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (divisor, 0) < 0))
                     88:          dump_abort (dividend, divisor);
                     89:
                     90:       mpz_mul (temp, quotient, divisor);
                     91:       mpz_add (temp, temp, remainder);
                     92:       if (mpz_cmp (temp, dividend) != 0)
                     93:        dump_abort (dividend, divisor);
                     94:
                     95:       mpz_abs (temp, divisor);
                     96:       mpz_abs (remainder, remainder);
                     97:       if (mpz_cmp (remainder, temp) >= 0)
                     98:        dump_abort (dividend, divisor);
                     99:     }
                    100:
                    101:   exit (0);
                    102: }
                    103:
                    104: dump_abort (dividend, divisor)
                    105:      mpz_t dividend, divisor;
                    106: {
                    107:   fprintf (stderr, "ERROR\n");
                    108:   fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
                    109:   fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
                    110:   abort();
                    111: }
                    112:
                    113: void
                    114: debug_mp (x, base)
                    115:      mpz_t x;
                    116: {
                    117:   mpz_out_str (stderr, base, x); fputc ('\n', stderr);
                    118: }