Home | History | Annotate | Line # | Download | only in tests
tset_z.c revision 1.1.1.6 
      1 /* Test file for mpfr_set_z.
      2 
      3 Copyright 1999, 2001-2023 Free Software Foundation, Inc.
      4 Contributed by the AriC and Caramba projects, INRIA.
      5 
      6 This file is part of the GNU MPFR Library.
      7 
      8 The GNU MPFR Library is free software; you can redistribute it and/or modify
      9 it under the terms of the GNU Lesser General Public License as published by
     10 the Free Software Foundation; either version 3 of the License, or (at your
     11 option) any later version.
     12 
     13 The GNU MPFR Library is distributed in the hope that it will be useful, but
     14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     15 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
     16 License for more details.
     17 
     18 You should have received a copy of the GNU Lesser General Public License
     19 along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
     20 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
     21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
     22 
     23 #include "mpfr-test.h"
     24 
     25 static void check0(void)
     26 {
     27   mpz_t y;
     28   mpfr_t x;
     29   int inexact, r;
     30 
     31   /* Check for +0 */
     32   mpfr_init (x);
     33   mpz_init (y);
     34   mpz_set_si (y, 0);
     35   RND_LOOP (r)
     36     {
     37       inexact = mpfr_set_z (x, y, (mpfr_rnd_t) r);
     38       if (!MPFR_IS_ZERO(x) || !MPFR_IS_POS(x) || inexact)
     39         {
     40           printf("mpfr_set_z(x,0) failed for %s\n",
     41                  mpfr_print_rnd_mode ((mpfr_rnd_t) r));
     42           exit(1);
     43         }
     44     }
     45   mpfr_clear(x);
     46   mpz_clear(y);
     47 }
     48 
     49 /* FIXME: It'd be better to examine the actual data in an mpfr_t to see that
     50    it's as expected.  Comparing mpfr_set_z with mpfr_cmp or against
     51    mpfr_get_si is a rather indirect test of a low level routine.  */
     52 
     53 static void
     54 check (long i, mpfr_rnd_t rnd)
     55 {
     56   mpfr_t f;
     57   mpz_t z;
     58 
     59   mpfr_init2 (f, 8 * sizeof(long));
     60   mpz_init (z);
     61   mpz_set_ui (z, i);
     62   mpfr_set_z (f, z, rnd);
     63   if (mpfr_get_si (f, MPFR_RNDZ) != i)
     64     {
     65       printf ("Error in mpfr_set_z for i=%ld rnd_mode=%d\n", i, rnd);
     66       exit (1);
     67     }
     68   mpfr_clear (f);
     69   mpz_clear (z);
     70 }
     71 
     72 static void
     73 check_large (void)
     74 {
     75   mpz_t z;
     76   mpfr_t x, y;
     77   mpfr_exp_t emax, emin;
     78 
     79   mpz_init (z);
     80   mpfr_init2 (x, 160);
     81   mpfr_init2 (y, 160);
     82 
     83   mpz_set_str (z, "77031627725494291259359895954016675357279104942148788042", 10);
     84   mpfr_set_z (x, z, MPFR_RNDN);
     85   mpfr_set_str_binary (y, "0.1100100100001111110110101010001000100001011010001100001000110100110001001100011001100010100010111000000011011100000111001101000100101001000000100100111000001001E186");
     86   if (mpfr_cmp (x, y))
     87     {
     88       printf ("Error in mpfr_set_z on large input\n");
     89       exit (1);
     90     }
     91 
     92   /* check overflow */
     93   emax = mpfr_get_emax ();
     94   set_emax (2);
     95   mpz_set_str (z, "7", 10);
     96   mpfr_set_z (x, z, MPFR_RNDU);
     97   MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
     98   set_emax (3);
     99   mpfr_set_prec (x, 2);
    100   mpz_set_str (z, "7", 10);
    101   mpfr_set_z (x, z, MPFR_RNDU);
    102   MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
    103   set_emax (emax);
    104 
    105   /* check underflow */
    106   emin = mpfr_get_emin ();
    107   set_emin (3);
    108   mpz_set_str (z, "1", 10);
    109   mpfr_set_z (x, z, MPFR_RNDZ);
    110   MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
    111   set_emin (2);
    112   mpfr_set_z (x, z, MPFR_RNDN);
    113   MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
    114   set_emin (emin);
    115 
    116   mpz_clear (z);
    117 
    118   mpfr_clear (x);
    119   mpfr_clear (y);
    120 }
    121 
    122 int
    123 main (int argc, char *argv[])
    124 {
    125   long j;
    126 
    127   tests_start_mpfr ();
    128 
    129   check_large ();
    130   check (0, MPFR_RNDN);
    131   for (j = 0; j < 200000; j++)
    132     check (randlimb () & LONG_MAX, RND_RAND ());
    133   check0 ();
    134 
    135   tests_end_mpfr ();
    136 
    137   return 0;
    138 }
    139