1/* Test file for mpfr_mul_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_mul_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_mul_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 * 0.0 is nan */
58  mpfr_clear_flags();
59  inexact = mpfr_mul_d (y, x, 0.0, MPFR_RNDN);
60  MPFR_ASSERTN (inexact == 0);
61  MPFR_ASSERTN ((__gmpfr_flags ^ MPFR_FLAGS_NAN) == 0);
62  MPFR_ASSERTN (mpfr_nan_p (y));
63
64  /* -inf * 1.0 == -inf */
65  mpfr_set_inf (x, -1);
66  mpfr_clear_flags();
67  inexact = mpfr_mul_d (y, x, 1.0, MPFR_RNDN);
68  MPFR_ASSERTN (inexact == 0);
69  MPFR_ASSERTN (__gmpfr_flags == 0);
70  MPFR_ASSERTN (mpfr_inf_p (y));
71  MPFR_ASSERTN (MPFR_IS_NEG (y));
72
73  mpfr_clear (x);
74  mpfr_clear (y);
75}
76
77#define TEST_FUNCTION mpfr_mul_d
78#define DOUBLE_ARG2
79#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS)
80#include "tgeneric.c"
81
82int
83main (void)
84{
85  mpfr_t x, y, z;
86  double d;
87  int inexact;
88
89  tests_start_mpfr ();
90
91  /* check with enough precision */
92  mpfr_init2 (x, IEEE_DBL_MANT_DIG);
93  mpfr_init2 (y, IEEE_DBL_MANT_DIG);
94  mpfr_init2 (z, IEEE_DBL_MANT_DIG);
95
96  mpfr_set_str (y, "4096", 10, MPFR_RNDN);
97  d = 0.125;
98  mpfr_clear_flags ();
99  inexact = mpfr_mul_d (x, y, d, MPFR_RNDN);
100  if (inexact != 0)
101    {
102      printf ("Inexact flag error in mpfr_mul_d\n");
103      exit (1);
104    }
105  mpfr_set_str (z, "512", 10, MPFR_RNDN);
106  if (mpfr_cmp (z, x))
107    {
108      printf ("Error in mpfr_mul_d (");
109      mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN);
110      printf (" + %.20g)\nexpected ", d);
111      mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN);
112      printf ("\ngot     ");
113      mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
114      printf ("\n");
115      exit (1);
116    }
117  mpfr_clears (x, y, z, (mpfr_ptr) 0);
118
119  check_nans ();
120
121  test_generic (2, 1000, 100);
122
123  tests_end_mpfr ();
124  return 0;
125}
126
127#else
128
129int
130main (void)
131{
132  printf ("Warning! Test disabled for this MPFR version.\n");
133  return 0;
134}
135
136#endif
137