1 /* Test file for mpfr_div_d
2
3 Copyright 2007-2023 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 <float.h>
24
25 #include "mpfr-test.h"
26
27 static void
28 check_nans (void)
29 {
30 mpfr_t x, y;
31 int inexact;
32
33 mpfr_init2 (x, 123);
34 mpfr_init2 (y, 123);
35
36 /* nan / 1.0 is nan */
37 mpfr_set_nan (x);
38 mpfr_clear_flags ();
39 inexact = mpfr_div_d (y, x, 1.0, MPFR_RNDN);
40 MPFR_ASSERTN (inexact == 0);
41 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
42 MPFR_ASSERTN (mpfr_nan_p (y));
43
44 /* +inf / 1.0 == +inf */
45 mpfr_set_inf (x, 1);
46 mpfr_clear_flags ();
47 inexact = mpfr_div_d (y, x, 1.0, MPFR_RNDN);
48 MPFR_ASSERTN (inexact == 0);
49 MPFR_ASSERTN (__gmpfr_flags == 0);
50 MPFR_ASSERTN (mpfr_inf_p (y));
51 MPFR_ASSERTN (MPFR_IS_POS (y));
52
53 /* -inf / 1.0 == -inf */
54 mpfr_set_inf (x, -1);
55 mpfr_clear_flags ();
56 inexact = mpfr_div_d (y, x, 1.0, MPFR_RNDN);
57 MPFR_ASSERTN (inexact == 0);
58 MPFR_ASSERTN (__gmpfr_flags == 0);
59 MPFR_ASSERTN (mpfr_inf_p (y));
60 MPFR_ASSERTN (MPFR_IS_NEG (y));
61
62 /* 0.0 / 0.0 is nan */
63 mpfr_set_ui (x, 0, MPFR_RNDN);
64 mpfr_clear_flags ();
65 inexact = mpfr_div_d (y, x, 0.0, MPFR_RNDN);
66 MPFR_ASSERTN (inexact == 0);
67 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
68 MPFR_ASSERTN (mpfr_nan_p (y));
69
70 /* 1.0 / 0.0 == +inf */
71 mpfr_set_ui (x, 1, MPFR_RNDN);
72 mpfr_clear_flags ();
73 inexact = mpfr_div_d (y, x, 0.0, MPFR_RNDN);
74 MPFR_ASSERTN (inexact == 0);
75 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0);
76 MPFR_ASSERTN (mpfr_inf_p (y));
77 MPFR_ASSERTN (MPFR_IS_POS (y));
78
79 /* -1.0 / 0.0 == -inf */
80 mpfr_set_si (x, -1, MPFR_RNDN);
81 mpfr_clear_flags ();
82 inexact = mpfr_div_d (y, x, 0.0, MPFR_RNDN);
83 MPFR_ASSERTN (inexact == 0);
84 MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0);
85 MPFR_ASSERTN (mpfr_inf_p (y));
86 MPFR_ASSERTN (MPFR_IS_NEG (y));
87
88 mpfr_clear (x);
89 mpfr_clear (y);
90 }
91
92 #define TEST_FUNCTION mpfr_div_d
93 #define DOUBLE_ARG2
94 #define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1, RANDS)
95 #include "tgeneric.c"
96
97 int
98 main (void)
99 {
100 mpfr_t x, y, z;
101 double d;
102 int inexact;
103
104 tests_start_mpfr ();
105
106 /* check with enough precision */
107 mpfr_init2 (x, IEEE_DBL_MANT_DIG);
108 mpfr_init2 (y, IEEE_DBL_MANT_DIG);
109 mpfr_init2 (z, IEEE_DBL_MANT_DIG);
110
111 mpfr_set_str (y, "4096", 10, MPFR_RNDN);
112 d = 0.125;
113 mpfr_clear_flags ();
114 inexact = mpfr_div_d (x, y, d, MPFR_RNDN);
115 if (inexact != 0)
116 {
117 printf ("Inexact flag error in mpfr_div_d\n");
118 exit (1);
119 }
120 mpfr_set_str (z, "32768", 10, MPFR_RNDN);
121 if (mpfr_cmp (z, x))
122 {
123 printf ("Error in mpfr_div_d (");
124 mpfr_out_str (stdout, 10, 0, y, MPFR_RNDN);
125 printf (" + %.20g)\nexpected ", d);
126 mpfr_out_str (stdout, 10, 0, z, MPFR_RNDN);
127 printf ("\ngot ");
128 mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
129 printf ("\n");
130 exit (1);
131 }
132 mpfr_clears (x, y, z, (mpfr_ptr) 0);
133
134 check_nans ();
135
136 test_generic (MPFR_PREC_MIN, 1000, 100);
137
138 tests_end_mpfr ();
139 return 0;
140 }