1/* Test file for mpfr_set_z.
2
3Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4Contributed by the Arenaire and Cacao projects, INRIA.
5
6This file is part of the GNU MPFR Library.
7
8The GNU MPFR Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MPFR Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
20http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23#include <stdio.h>
24#include <stdlib.h>
25#include <limits.h>
26
27#include "mpfr-test.h"
28
29static void check0(void)
30{
31  mpz_t y;
32  mpfr_t x;
33  int inexact, r;
34
35  /* Check for +0 */
36  mpfr_init (x);
37  mpz_init (y);
38  mpz_set_si (y, 0);
39  for(r = 0; r < MPFR_RND_MAX; r++)
40    {
41      inexact = mpfr_set_z (x, y, (mpfr_rnd_t) r);
42      if (!MPFR_IS_ZERO(x) || !MPFR_IS_POS(x) || inexact)
43        {
44          printf("mpfr_set_z(x,0) failed for %s\n",
45                 mpfr_print_rnd_mode ((mpfr_rnd_t) r));
46          exit(1);
47        }
48    }
49  mpfr_clear(x);
50  mpz_clear(y);
51}
52
53/* FIXME: It'd be better to examine the actual data in an mpfr_t to see that
54   it's as expected.  Comparing mpfr_set_z with mpfr_cmp or against
55   mpfr_get_si is a rather indirect test of a low level routine.  */
56
57static void
58check (long i, mpfr_rnd_t rnd)
59{
60  mpfr_t f;
61  mpz_t z;
62
63  mpfr_init2 (f, 8 * sizeof(long));
64  mpz_init (z);
65  mpz_set_ui (z, i);
66  mpfr_set_z (f, z, rnd);
67  if (mpfr_get_si (f, MPFR_RNDZ) != i)
68    {
69      printf ("Error in mpfr_set_z for i=%ld rnd_mode=%d\n", i, rnd);
70      exit (1);
71    }
72  mpfr_clear (f);
73  mpz_clear (z);
74}
75
76static void
77check_large (void)
78{
79  mpz_t z;
80  mpfr_t x, y;
81  mpfr_exp_t emax, emin;
82
83  mpz_init (z);
84  mpfr_init2 (x, 160);
85  mpfr_init2 (y, 160);
86
87  mpz_set_str (z, "77031627725494291259359895954016675357279104942148788042", 10);
88  mpfr_set_z (x, z, MPFR_RNDN);
89  mpfr_set_str_binary (y, "0.1100100100001111110110101010001000100001011010001100001000110100110001001100011001100010100010111000000011011100000111001101000100101001000000100100111000001001E186");
90  if (mpfr_cmp (x, y))
91    {
92      printf ("Error in mpfr_set_z on large input\n");
93      exit (1);
94    }
95
96  /* check overflow */
97  emax = mpfr_get_emax ();
98  set_emax (2);
99  mpz_set_str (z, "7", 10);
100  mpfr_set_z (x, z, MPFR_RNDU);
101  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
102  set_emax (3);
103  mpfr_set_prec (x, 2);
104  mpz_set_str (z, "7", 10);
105  mpfr_set_z (x, z, MPFR_RNDU);
106  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
107  set_emax (emax);
108
109  /* check underflow */
110  emin = mpfr_get_emin ();
111  set_emin (3);
112  mpz_set_str (z, "1", 10);
113  mpfr_set_z (x, z, MPFR_RNDZ);
114  MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
115  set_emin (2);
116  mpfr_set_z (x, z, MPFR_RNDN);
117  MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
118  set_emin (emin);
119
120  mpz_clear (z);
121
122  mpfr_clear (x);
123  mpfr_clear (y);
124}
125
126int
127main (int argc, char *argv[])
128{
129  long j;
130
131  tests_start_mpfr ();
132
133  check_large ();
134  check (0, MPFR_RNDN);
135  for (j = 0; j < 200000; j++)
136    check (randlimb () & LONG_MAX, RND_RAND ());
137  check0 ();
138
139  tests_end_mpfr ();
140
141  return 0;
142}
143