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/* Test mpf_div.
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Copyright 2004 Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "tests.h"
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void
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check_one (const char *desc, mpf_ptr got, mpf_srcptr u, mpf_srcptr v)
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{
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if (! refmpf_validate_division ("mpf_div", got, u, v))
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{
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mp_trace_base = -16;
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mpf_trace (" u", u);
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mpf_trace (" v", v);
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printf (" %s\n", desc);
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abort ();
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}
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}
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void
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check_rand (void)
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{
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unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
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gmp_randstate_ptr rands = RANDS;
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unsigned long prec;
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mpf_t got, u, v;
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int i;
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mpf_init (got);
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mpf_init (u);
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mpf_init (v);
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/* separate */
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for (i = 0; i < 100; i++)
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{
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/* got precision */
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prec = min_prec + gmp_urandomm_ui (rands, 15L);
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refmpf_set_prec_limbs (got, prec);
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/* u */
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prec = min_prec + gmp_urandomm_ui (rands, 15L);
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refmpf_set_prec_limbs (u, prec);
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do {
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mpf_random2 (u, PREC(u), (mp_exp_t) 20);
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} while (SIZ(u) == 0);
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if (gmp_urandomb_ui (rands, 1L))
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mpf_neg (u, u);
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/* v */
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prec = min_prec + gmp_urandomm_ui (rands, 15L);
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refmpf_set_prec_limbs (v, prec);
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do {
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mpf_random2 (v, PREC(v), (mp_exp_t) 20);
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} while (SIZ(v) == 0);
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if (gmp_urandomb_ui (rands, 1L))
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mpf_neg (v, v);
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switch (i % 3) {
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case 0:
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mpf_div (got, u, v);
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check_one ("separate", got, u, v);
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break;
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case 1:
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prec = refmpf_set_overlap (got, u);
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mpf_div (got, got, v);
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check_one ("dst == u", got, u, v);
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mpf_set_prec_raw (got, prec);
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break;
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case 2:
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prec = refmpf_set_overlap (got, v);
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mpf_div (got, u, got);
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check_one ("dst == v", got, u, v);
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mpf_set_prec_raw (got, prec);
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break;
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}
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}
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mpf_clear (got);
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mpf_clear (u);
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mpf_clear (v);
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}
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/* Exercise calls mpf(x,x,x) */
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void
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check_reuse_three (void)
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{
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unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
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gmp_randstate_ptr rands = RANDS;
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unsigned long result_prec, input_prec, set_prec;
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mpf_t got;
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int i;
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mpf_init (got);
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for (i = 0; i < 8; i++)
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{
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result_prec = min_prec + gmp_urandomm_ui (rands, 15L);
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input_prec = min_prec + gmp_urandomm_ui (rands, 15L);
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set_prec = MAX (result_prec, input_prec);
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refmpf_set_prec_limbs (got, set_prec);
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/* input, non-zero, possibly negative */
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PREC(got) = input_prec;
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do {
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mpf_random2 (got, input_prec, (mp_exp_t) 20);
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} while (SIZ(got) == 0);
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if (gmp_urandomb_ui (rands, 1L))
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mpf_neg (got, got);
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PREC(got) = result_prec;
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mpf_div (got, got, got);
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/* expect exactly 1.0 always */
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ASSERT_ALWAYS (mpf_cmp_ui (got, 1L) == 0);
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PREC(got) = set_prec;
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}
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mpf_clear (got);
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}
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void
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check_various (void)
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{
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mpf_t got, u, v;
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mpf_init (got);
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mpf_init (u);
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mpf_init (v);
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/* 100/4 == 25 */
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mpf_set_prec (got, 20L);
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mpf_set_ui (u, 100L);
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mpf_set_ui (v, 4L);
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mpf_div (got, u, v);
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MPF_CHECK_FORMAT (got);
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ASSERT_ALWAYS (mpf_cmp_ui (got, 25L) == 0);
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/* 1/(2^n+1), a case where truncating the divisor would be wrong */
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mpf_set_prec (got, 500L);
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mpf_set_prec (v, 900L);
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mpf_set_ui (v, 1L);
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mpf_mul_2exp (v, v, 800L);
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mpf_add_ui (v, v, 1L);
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mpf_div (got, u, v);
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check_one ("1/2^n+1, separate", got, u, v);
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mpf_clear (got);
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mpf_clear (u);
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mpf_clear (v);
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}
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int
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main (void)
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{
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tests_start ();
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check_various ();
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check_rand ();
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check_reuse_three ();
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tests_end ();
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exit (0);
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}
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