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974e12c1f0
Old version was 3.1.2 and is quite old: 2013-03-13 A lot has happened since then 4.0.1 is from 2018-02-07
314 lines
8.9 KiB
C
314 lines
8.9 KiB
C
/* Test file for mpz_set_fr / mpfr_get_z.
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Copyright 2004, 2006-2018 Free Software Foundation, Inc.
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Contributed by the AriC and Caramba projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "mpfr-test.h"
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static void
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check_diff (void)
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{
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int inex;
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mpfr_t x;
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mpz_t z;
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mpfr_exp_t emin;
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mpz_init (z);
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mpfr_init2 (x, 2);
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mpfr_set_ui (x, 2047, MPFR_RNDU);
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mpz_set_fr (z, x, MPFR_RNDN);
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if (mpz_cmp_ui (z, 2048) != 0)
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{
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printf ("get_z RU 2048 failed\n");
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exit (1);
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}
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mpfr_set_prec (x, 6);
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mpfr_set_str (x, "17.5", 10, MPFR_RNDN);
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inex = mpfr_get_z (z, x, MPFR_RNDN);
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if (inex <= 0 || mpz_cmp_ui (z, 18) != 0)
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{
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printf ("get_z RN 17.5 failed\n");
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exit (1);
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}
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/* save default emin */
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emin = mpfr_get_emin ();;
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mpfr_set_emin (17);
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mpfr_set_ui (x, 0, MPFR_RNDN);
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inex = mpfr_get_z (z, x, MPFR_RNDN);
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if (inex != 0 || mpz_cmp_ui (z, 0) != 0)
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{
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printf ("get_z 0 failed\n");
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exit (1);
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}
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/* restore default emin */
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mpfr_set_emin (emin);
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mpfr_clear (x);
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mpz_clear (z);
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}
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static void
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check_one (mpz_ptr z)
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{
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mpfr_exp_t emin, emax;
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int inex;
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int sh, neg;
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mpfr_t f;
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mpz_t got, ex, t;
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emin = mpfr_get_emin ();
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emax = mpfr_get_emax ();
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mpfr_init2 (f, MAX (mpz_sizeinbase (z, 2), MPFR_PREC_MIN));
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mpz_init (got);
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mpz_init (ex);
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mpz_init (t);
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for (sh = -2*GMP_NUMB_BITS ; sh < 2*GMP_NUMB_BITS ; sh++)
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{
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inex = mpfr_set_z (f, z, MPFR_RNDN); /* exact */
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MPFR_ASSERTN (inex == 0);
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inex = sh < 0 ?
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mpfr_div_2exp (f, f, -sh, MPFR_RNDN) :
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mpfr_mul_2exp (f, f, sh, MPFR_RNDN);
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MPFR_ASSERTN (inex == 0);
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for (neg = 0; neg <= 1; neg++)
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{
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int rnd;
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/* Test (-1)^neg * z * 2^sh */
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RND_LOOP_NO_RNDF (rnd)
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{
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int ex_inex, same;
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int d, fi, e;
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mpfr_flags_t flags[3] = { 0, MPFR_FLAGS_ALL ^ MPFR_FLAGS_ERANGE,
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MPFR_FLAGS_ALL }, ex_flags, gt_flags;
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if (neg)
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mpz_neg (ex, z);
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else
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mpz_set (ex, z);
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if (sh < 0)
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switch (rnd)
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{
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case MPFR_RNDN:
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mpz_set_si (t, neg ? -1 : 1);
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mpz_mul_2exp (t, t, -sh - 1);
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mpz_add (ex, ex, t);
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/* d = mpz_divisible_2exp_p (ex, -sh); */
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d = mpz_scan1 (ex, 0) >= -sh;
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mpz_tdiv_q_2exp (ex, ex, -sh);
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if (d && mpz_tstbit (ex, 0) != 0) /* even rounding */
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{
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if (neg)
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mpz_add_ui (ex, ex, 1);
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else
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mpz_sub_ui (ex, ex, 1);
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}
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break;
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case MPFR_RNDZ:
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mpz_tdiv_q_2exp (ex, ex, -sh);
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break;
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case MPFR_RNDU:
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mpz_cdiv_q_2exp (ex, ex, -sh);
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break;
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case MPFR_RNDD:
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mpz_fdiv_q_2exp (ex, ex, -sh);
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break;
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case MPFR_RNDA:
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if (neg)
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mpz_fdiv_q_2exp (ex, ex, -sh);
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else
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mpz_cdiv_q_2exp (ex, ex, -sh);
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break;
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default:
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MPFR_ASSERTN (0);
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}
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else
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mpz_mul_2exp (ex, ex, sh);
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ex_inex = - mpfr_cmp_z (f, ex);
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ex_inex = VSIGN (ex_inex);
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for (fi = 0; fi < numberof (flags); fi++)
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for (e = 0; e < 2; e++)
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{
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if (e)
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{
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mpfr_exp_t ef;
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if (MPFR_IS_ZERO (f))
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break;
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ef = MPFR_GET_EXP (f);
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set_emin (ef);
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set_emax (ef);
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}
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ex_flags = __gmpfr_flags = flags[fi];
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if (ex_inex != 0)
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ex_flags |= MPFR_FLAGS_INEXACT;
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inex = mpfr_get_z (got, f, (mpfr_rnd_t) rnd);
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inex = VSIGN (inex);
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gt_flags = __gmpfr_flags;
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set_emin (emin);
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set_emax (emax);
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same = SAME_SIGN (inex, ex_inex);
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if (mpz_cmp (got, ex) != 0 ||
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!same || gt_flags != ex_flags)
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{
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printf ("Error in check_one for sh=%d, fi=%d, %s%s\n",
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sh, fi,
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mpfr_print_rnd_mode ((mpfr_rnd_t) rnd),
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e ? ", reduced exponent range" : "");
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printf (" f = "); mpfr_dump (f);
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printf ("expected "); mpz_out_str (stdout, 10, ex);
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printf ("\n got "); mpz_out_str (stdout, 10, got);
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printf ("\nExpected inex ~ %d, got %d (%s)\n",
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ex_inex, inex, same ? "OK" : "wrong");
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printf ("Flags:\n");
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printf (" in"); flags_out (flags[fi]);
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printf ("expected"); flags_out (ex_flags);
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printf (" got"); flags_out (gt_flags);
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exit (1);
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}
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}
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}
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mpfr_neg (f, f, MPFR_RNDN);
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}
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}
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mpfr_clear (f);
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mpz_clear (got);
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mpz_clear (ex);
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mpz_clear (t);
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}
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static void
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check (void)
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{
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mpz_t z;
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mpz_init (z);
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mpz_set_ui (z, 0L);
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check_one (z);
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mpz_set_si (z, 17L);
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check_one (z);
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mpz_set_si (z, 123L);
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check_one (z);
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mpz_rrandomb (z, RANDS, 2*GMP_NUMB_BITS);
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check_one (z);
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mpz_rrandomb (z, RANDS, 5*GMP_NUMB_BITS);
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check_one (z);
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mpz_clear (z);
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}
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static void
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special (void)
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{
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int inex;
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mpfr_t x;
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mpz_t z;
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int i, fi;
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int rnd;
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mpfr_exp_t e;
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mpfr_flags_t flags[3] = { 0, MPFR_FLAGS_ALL ^ MPFR_FLAGS_ERANGE,
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MPFR_FLAGS_ALL }, ex_flags, gt_flags;
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mpfr_init2 (x, 2);
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mpz_init (z);
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RND_LOOP (rnd)
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for (i = -1; i <= 1; i++)
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for (fi = 0; fi < numberof (flags); fi++)
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{
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ex_flags = flags[fi] | MPFR_FLAGS_ERANGE;
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if (i != 0)
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mpfr_set_nan (x);
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else
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mpfr_set_inf (x, i);
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__gmpfr_flags = flags[fi];
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inex = mpfr_get_z (z, x, (mpfr_rnd_t) rnd);
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gt_flags = __gmpfr_flags;
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if (gt_flags != ex_flags || inex != 0 || mpz_cmp_ui (z, 0) != 0)
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{
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printf ("special() failed on mpfr_get_z"
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" for %s, i = %d, fi = %d\n",
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mpfr_print_rnd_mode ((mpfr_rnd_t) rnd), i, fi);
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printf ("Expected z = 0, inex = 0,");
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flags_out (ex_flags);
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printf ("Got z = ");
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mpz_out_str (stdout, 10, z);
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printf (", inex = %d,", inex);
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flags_out (gt_flags);
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exit (1);
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}
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__gmpfr_flags = flags[fi];
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e = mpfr_get_z_2exp (z, x);
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gt_flags = __gmpfr_flags;
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if (gt_flags != ex_flags || e != __gmpfr_emin ||
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mpz_cmp_ui (z, 0) != 0)
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{
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printf ("special() failed on mpfr_get_z_2exp"
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" for %s, i = %d, fi = %d\n",
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mpfr_print_rnd_mode ((mpfr_rnd_t) rnd), i, fi);
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printf ("Expected z = 0, e = %" MPFR_EXP_FSPEC "d,",
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(mpfr_eexp_t) __gmpfr_emin);
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flags_out (ex_flags);
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printf ("Got z = ");
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mpz_out_str (stdout, 10, z);
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printf (", e = %" MPFR_EXP_FSPEC "d,", (mpfr_eexp_t) e);
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flags_out (gt_flags);
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exit (1);
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}
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}
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mpfr_clear (x);
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mpz_clear (z);
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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_mpfr ();
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check ();
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check_diff ();
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special ();
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tests_end_mpfr ();
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return 0;
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}
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