t-div.c
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上传日期:2022-08-06
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- /* Test mpf_div.
- Copyright 2004 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"
- void
- check_one (const char *desc, mpf_ptr got, mpf_srcptr u, mpf_srcptr v)
- {
- if (! refmpf_validate_division ("mpf_div", got, u, v))
- {
- mp_trace_base = -16;
- mpf_trace (" u", u);
- mpf_trace (" v", v);
- printf (" %sn", desc);
- abort ();
- }
- }
- void
- check_rand (void)
- {
- unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
- gmp_randstate_ptr rands = RANDS;
- unsigned long prec;
- mpf_t got, u, v;
- int i;
- mpf_init (got);
- mpf_init (u);
- mpf_init (v);
- /* separate */
- for (i = 0; i < 100; i++)
- {
- /* got precision */
- prec = min_prec + gmp_urandomm_ui (rands, 15L);
- refmpf_set_prec_limbs (got, prec);
- /* u */
- prec = min_prec + gmp_urandomm_ui (rands, 15L);
- refmpf_set_prec_limbs (u, prec);
- do {
- mpf_random2 (u, PREC(u), (mp_exp_t) 20);
- } while (SIZ(u) == 0);
- if (gmp_urandomb_ui (rands, 1L))
- mpf_neg (u, u);
- /* v */
- prec = min_prec + gmp_urandomm_ui (rands, 15L);
- refmpf_set_prec_limbs (v, prec);
- do {
- mpf_random2 (v, PREC(v), (mp_exp_t) 20);
- } while (SIZ(v) == 0);
- if (gmp_urandomb_ui (rands, 1L))
- mpf_neg (v, v);
- switch (i % 3) {
- case 0:
- mpf_div (got, u, v);
- check_one ("separate", got, u, v);
- break;
- case 1:
- prec = refmpf_set_overlap (got, u);
- mpf_div (got, got, v);
- check_one ("dst == u", got, u, v);
- mpf_set_prec_raw (got, prec);
- break;
- case 2:
- prec = refmpf_set_overlap (got, v);
- mpf_div (got, u, got);
- check_one ("dst == v", got, u, v);
- mpf_set_prec_raw (got, prec);
- break;
- }
- }
- mpf_clear (got);
- mpf_clear (u);
- mpf_clear (v);
- }
- /* Exercise calls mpf(x,x,x) */
- void
- check_reuse_three (void)
- {
- unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
- gmp_randstate_ptr rands = RANDS;
- unsigned long result_prec, input_prec, set_prec;
- mpf_t got;
- int i;
- mpf_init (got);
- for (i = 0; i < 8; i++)
- {
- result_prec = min_prec + gmp_urandomm_ui (rands, 15L);
- input_prec = min_prec + gmp_urandomm_ui (rands, 15L);
- set_prec = MAX (result_prec, input_prec);
- refmpf_set_prec_limbs (got, set_prec);
- /* input, non-zero, possibly negative */
- PREC(got) = input_prec;
- do {
- mpf_random2 (got, input_prec, (mp_exp_t) 20);
- } while (SIZ(got) == 0);
- if (gmp_urandomb_ui (rands, 1L))
- mpf_neg (got, got);
- PREC(got) = result_prec;
- mpf_div (got, got, got);
- /* expect exactly 1.0 always */
- ASSERT_ALWAYS (mpf_cmp_ui (got, 1L) == 0);
- PREC(got) = set_prec;
- }
- mpf_clear (got);
- }
- void
- check_various (void)
- {
- mpf_t got, u, v;
- mpf_init (got);
- mpf_init (u);
- mpf_init (v);
- /* 100/4 == 25 */
- mpf_set_prec (got, 20L);
- mpf_set_ui (u, 100L);
- mpf_set_ui (v, 4L);
- mpf_div (got, u, v);
- MPF_CHECK_FORMAT (got);
- ASSERT_ALWAYS (mpf_cmp_ui (got, 25L) == 0);
- /* 1/(2^n+1), a case where truncating the divisor would be wrong */
- mpf_set_prec (got, 500L);
- mpf_set_prec (v, 900L);
- mpf_set_ui (v, 1L);
- mpf_mul_2exp (v, v, 800L);
- mpf_add_ui (v, v, 1L);
- mpf_div (got, u, v);
- check_one ("1/2^n+1, separate", got, u, v);
- mpf_clear (got);
- mpf_clear (u);
- mpf_clear (v);
- }
- int
- main (void)
- {
- tests_start ();
- check_various ();
- check_rand ();
- check_reuse_three ();
- tests_end ();
- exit (0);
- }