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