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Annotation of OpenXM_contrib/gmp/mpf/tests/t-dm2exp.c, Revision 1.1.1.1

1.1       maekawa     1: /* Test mpf_div, mpf_div_2exp, mpf_mul_2exp.
                      2:
                      3: Copyright (C) 1996 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Library General Public License as published by
                      9: the Free Software Foundation; either version 2 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Library General Public License
                     18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include <stdio.h>
                     23: #include "gmp.h"
                     24: #include "gmp-impl.h"
                     25: #include "urandom.h"
                     26:
                     27: #ifndef SIZE
                     28: #define SIZE 16
                     29: #endif
                     30:
                     31: main (argc, argv)
                     32:      int argc;
                     33:      char **argv;
                     34: {
                     35:   int reps = 500000;
                     36:   int i;
                     37:   mpf_t u, v, w1, w2;
                     38:   mp_size_t bprec = 100;
                     39:   mpf_t rerr, limit_rerr;
                     40:
                     41:   if (argc > 1)
                     42:     {
                     43:       reps = strtol (argv[1], 0, 0);
                     44:       if (argc > 2)
                     45:        bprec = strtol (argv[2], 0, 0);
                     46:     }
                     47:
                     48:   mpf_set_default_prec (bprec);
                     49:
                     50:   mpf_init (rerr);
                     51:   mpf_init (limit_rerr);
                     52:
                     53:   mpf_init (u);
                     54:   mpf_init (v);
                     55:   mpf_init (w1);
                     56:   mpf_init (w2);
                     57:
                     58:   for (i = 0; i < reps; i++)
                     59:     {
                     60:       mp_size_t res_prec;
                     61:       unsigned long int pow2;
                     62:
                     63:       res_prec = urandom () % (bprec + 100);
                     64:       mpf_set_prec (w1, res_prec);
                     65:       mpf_set_prec (w2, res_prec);
                     66:
                     67:       mpf_set_ui (limit_rerr, 1);
                     68:       mpf_div_2exp (limit_rerr, limit_rerr, res_prec);
                     69:
                     70:       pow2 = urandom () % 0x10000;
                     71:       mpf_set_ui (v, 1);
                     72:       mpf_mul_2exp (v, v, pow2);
                     73:
                     74:       mpf_div_2exp (w1, u, pow2);
                     75:       mpf_div (w2, u, v);
                     76:       mpf_reldiff (rerr, w1, w2);
                     77:       if (mpf_cmp (rerr, limit_rerr) > 0)
                     78:        {
                     79:          printf ("ERROR in mpf_div or mpf_div_2exp after %d tests\n", i);
                     80:          printf ("   u = "); mpf_dump (u);
                     81:          printf ("   v = "); mpf_dump (v);
                     82:          printf ("  w1 = "); mpf_dump (w1);
                     83:          printf ("  w2 = "); mpf_dump (w2);
                     84:          abort ();
                     85:        }
                     86:     }
                     87:
                     88:   exit (0);
                     89: }
                     90:
                     91: oo (x)
                     92:      mpf_t x;
                     93: {
                     94:   mp_size_t i;
                     95:   printf (" exp = %ld\n", x->_mp_exp);
                     96:   printf ("size = %d\n", x->_mp_size);
                     97:   for (i = ABS (x->_mp_size) - 1; i >= 0; i--)
                     98:     printf ("%08lX ", x->_mp_d[i]);
                     99:   printf ("\n");
                    100:   mpf_dump (x);
                    101: }