1/* Test file for mpfr_div_d
2
3Copyright 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 <float.h>
26
27#include "mpfr-test.h"
28
29#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0)
30
31static void
32check_nans (void)
33{
34  mpfr_t  x, y;
35  int inexact;
36
37  mpfr_init2 (x, 123);
38  mpfr_init2 (y, 123);
39
40  /* nan / 1.0 is nan */
41  mpfr_set_nan (x);
42  mpfr_clear_flags ();
43  inexact = mpfr_div_d (y, x, 1.0, MPFR_RNDN);
44  MPFR_ASSERTN (inexact == 0);
45  MPFR_ASSERTN ((__gmpfr_flags ^ MPFR_FLAGS_NAN) == 0);
46  MPFR_ASSERTN (mpfr_nan_p (y));
47
48  /* +inf / 1.0 == +inf */
49  mpfr_set_inf (x, 1);
50  mpfr_clear_flags ();
51  inexact = mpfr_div_d (y, x, 1.0, MPFR_RNDN);
52  MPFR_ASSERTN (inexact == 0);
53  MPFR_ASSERTN (__gmpfr_flags == 0);
54  MPFR_ASSERTN (mpfr_inf_p (y));
55  MPFR_ASSERTN (MPFR_IS_POS (y));
56
57  /* -inf / 1.0 == -inf */
58  mpfr_set_inf (x, -1);
59  mpfr_clear_flags ();
60  inexact = mpfr_div_d (y, x, 1.0, MPFR_RNDN);
61  MPFR_ASSERTN (inexact == 0);
62  MPFR_ASSERTN (__gmpfr_flags == 0);
63  MPFR_ASSERTN (mpfr_inf_p (y));
64  MPFR_ASSERTN (MPFR_IS_NEG (y));
65
66  /* 0.0 / 0.0 is nan */
67  mpfr_set_d (x, 0.0, MPFR_RNDN);
68  mpfr_clear_flags ();
69  inexact = mpfr_div_d (y, x, 0.0, MPFR_RNDN);
70  MPFR_ASSERTN (inexact == 0);
71  MPFR_ASSERTN ((__gmpfr_flags ^ MPFR_FLAGS_NAN) == 0);
72  MPFR_ASSERTN (mpfr_nan_p (y));
73
74  mpfr_clear (x);
75  mpfr_clear (y);
76}
77
78#define TEST_FUNCTION mpfr_sub_d
79#define DOUBLE_ARG2
80#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS)
81#include "tgeneric.c"
82
83int
84main (void)
85{
86  mpfr_t x, y, z;
87  double d;
88  int inexact;
89
90  tests_start_mpfr ();
91
92  /* check with enough precision */
93  mpfr_init2 (x, IEEE_DBL_MANT_DIG);
94  mpfr_init2 (y, IEEE_DBL_MANT_DIG);
95  mpfr_init2 (z, IEEE_DBL_MANT_DIG);
96
97  mpfr_set_str (y, "4096", 10, MPFR_RNDN);
98  d = 0.125;
99  mpfr_clear_flags ();
100  inexact = mpfr_div_d (x, y, d, MPFR_RNDN);
101  if (inexact != 0)
102    {
103      printf ("Inexact flag error in mpfr_div_d\n");
104      exit (1);
105    }
106  mpfr_set_str (z, "32768", 10, MPFR_RNDN);
107  if (mpfr_cmp (z, x))
108    {
109      printf ("Error in mpfr_div_d (");
110      mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN);
111      printf (" + %.20g)\nexpected ", d);
112      mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN);
113      printf ("\ngot     ");
114      mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
115      printf ("\n");
116      exit (1);
117    }
118  mpfr_clears (x, y, z, (mpfr_ptr) 0);
119
120  check_nans ();
121
122  test_generic (2, 1000, 100);
123
124  tests_end_mpfr ();
125  return 0;
126}
127
128#else
129
130int
131main (void)
132{
133  printf ("Warning! Test disabled for this MPFR version.\n");
134  return 0;
135}
136
137#endif
138