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Annotation of OpenXM_contrib/gmp/mpz/tests/t-2exp.c, Revision 1.1.1.1

1.1       maekawa     1: /* Test mpz_ui_pow_ui, mpz_fdiv_q, mpz_fdiv_q_2exp, mpz_fdiv_r,
                      2:    mpz_fdiv_r_2exp, and mpz_mul_2exp.
                      3:
                      4: Copyright (C) 1997, 1999, 2000 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 "gmp.h"
                     25: #include "gmp-impl.h"
                     26: #include "longlong.h"
                     27: #include "urandom.h"
                     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 x, r1, r2, q1, q2, d, t;
                     38:   unsigned long int c;
                     39:   int test;
                     40:   int ntests = 100000;
                     41:
                     42:   if (argc == 2)
                     43:      ntests = atoi (argv[1]);
                     44:
                     45:   mpz_init (x);
                     46:   mpz_init (q1);
                     47:   mpz_init (q2);
                     48:   mpz_init (r1);
                     49:   mpz_init (r2);
                     50:   mpz_init (d);
                     51:   mpz_init (t);
                     52:
                     53:   for (test = 1; test <= ntests; test++)
                     54:     {
                     55:       mpz_random2 (x, urandom () % (2 * SIZE) - SIZE);
                     56:       c = urandom () % (3 * SIZE / 2 * BITS_PER_MP_LIMB);
                     57:       mpz_ui_pow_ui (d, (unsigned long) 2, c);
                     58:
                     59:       mpz_fdiv_q (q1, x, d);
                     60:       mpz_fdiv_q_2exp (q2, x, c);
                     61:       mpz_fdiv_r (r1, x, d);
                     62:       mpz_fdiv_r_2exp (r2, x, c);
                     63:
                     64:       if (mpz_cmp (q1, q2) != 0 || mpz_cmp (r1, r2) != 0)
                     65:        abort ();
                     66:
                     67:       mpz_mul_2exp (t, q1, c);
                     68:       mpz_add (t, t, r1);
                     69:       if (mpz_cmp (t, x) != 0)
                     70:        abort ();
                     71:
                     72:       if (mpz_cmp (r1, d) >= 0)
                     73:        abort ();
                     74:     }
                     75:
                     76:   exit (0);
                     77: }