t-dm2exp.c
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上传日期:2022-08-06
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- /* Test mpf_div, mpf_div_2exp, mpf_mul_2exp.
- Copyright 1996, 2000, 2001 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- #ifndef SIZE
- #define SIZE 16
- #endif
- int
- main (int argc, char **argv)
- {
- int reps = 100000;
- int i;
- mpf_t u, v, w1, w2, w3;
- mp_size_t bprec = 100;
- mpf_t rerr, limit_rerr;
- mp_size_t un;
- mp_exp_t ue;
- tests_start ();
- if (argc > 1)
- {
- reps = strtol (argv[1], 0, 0);
- if (argc > 2)
- bprec = strtol (argv[2], 0, 0);
- }
- mpf_set_default_prec (bprec);
- mpf_init (rerr);
- mpf_init (limit_rerr);
- mpf_init (u);
- mpf_init (v);
- mpf_init (w1);
- mpf_init (w2);
- mpf_init (w3);
- for (i = 0; i < reps; i++)
- {
- unsigned long int res_prec;
- unsigned long int pow2;
- res_prec = urandom () % (bprec + 100);
- mpf_set_prec (w1, res_prec);
- mpf_set_prec (w2, res_prec);
- mpf_set_prec (w3, res_prec);
- mpf_set_ui (limit_rerr, 1);
- mpf_div_2exp (limit_rerr, limit_rerr, res_prec);
- pow2 = urandom () % 0x10000;
- mpf_set_ui (v, 1);
- mpf_mul_2exp (v, v, pow2);
- un = urandom () % (2 * SIZE) - SIZE;
- ue = urandom () % SIZE;
- mpf_random2 (u, un, ue);
- mpf_div_2exp (w1, u, pow2);
- mpf_div (w2, u, v);
- mpf_reldiff (rerr, w1, w2);
- if (mpf_cmp (rerr, limit_rerr) > 0)
- {
- printf ("ERROR in mpf_div or mpf_div_2exp after %d testsn", i);
- printf (" u = "); mpf_dump (u);
- printf (" v = "); mpf_dump (v);
- printf (" w1 = "); mpf_dump (w1);
- printf (" w2 = "); mpf_dump (w2);
- abort ();
- }
- mpf_mul_2exp (w3, w1, pow2);
- mpf_reldiff (rerr, u, w3);
- if (mpf_cmp (rerr, limit_rerr) > 0)
- {
- printf ("ERROR in mpf_mul_2exp after %d testsn", i);
- printf (" u = "); mpf_dump (u);
- printf (" v = "); mpf_dump (v);
- printf (" w1 = "); mpf_dump (w1);
- printf (" w3 = "); mpf_dump (w3);
- abort ();
- }
- }
- mpf_clear (rerr);
- mpf_clear (limit_rerr);
- mpf_clear (u);
- mpf_clear (v);
- mpf_clear (w1);
- mpf_clear (w2);
- mpf_clear (w3);
- tests_end ();
- exit (0);
- }