1 /* Test file for mpfr_tanh.
2
3 Copyright 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 #define TEST_FUNCTION mpfr_tanh
26 #define TEST_RANDOM_EMIN -36
27 #define TEST_RANDOM_EMAX 36
28 #include "tgeneric.c"
29
30 static void
31 special (void)
32 {
33 mpfr_t x;
34
35 mpfr_init (x);
36
37 mpfr_set_nan (x);
38 mpfr_tanh (x, x, MPFR_RNDN);
39 MPFR_ASSERTN(mpfr_nan_p (x));
40
41 mpfr_set_inf (x, 1);
42 mpfr_tanh (x, x, MPFR_RNDN);
43 MPFR_ASSERTN(mpfr_cmp_ui (x, 1) == 0);
44
45 mpfr_set_inf (x, -1);
46 mpfr_tanh (x, x, MPFR_RNDN);
47 MPFR_ASSERTN(mpfr_cmp_si (x, -1) == 0);
48
49 mpfr_set_prec (x, 10);
50 mpfr_set_str_binary (x, "-0.1001011001");
51 mpfr_tanh (x, x, MPFR_RNDN);
52 MPFR_ASSERTN(mpfr_cmp_si_2exp (x, -135, -8) == 0);
53
54 mpfr_clear (x);
55 }
56
57 static void
58 special_overflow (void)
59 {
60 mpfr_t x, y;
61 int i;
62 mpfr_exp_t emin, emax;
63
64 emin = mpfr_get_emin ();
65 emax = mpfr_get_emax ();
66
67 mpfr_clear_overflow ();
68 set_emin (-125);
69 set_emax (128);
70 mpfr_init2 (x, 24);
71 mpfr_init2 (y, 24);
72
73 mpfr_set_str_binary (x, "0.101100100000000000110100E7");
74 i = mpfr_tanh (y, x, MPFR_RNDN);
75 if (mpfr_cmp_ui (y, 1) || i != 1)
76 {
77 printf("Overflow error (1). i=%d\ny=", i);
78 mpfr_dump (y);
79 exit (1);
80 }
81 MPFR_ASSERTN (!mpfr_overflow_p ());
82
83 i = mpfr_tanh (y, x, MPFR_RNDZ);
84 if (mpfr_cmp_str (y, "0.111111111111111111111111E0", 2, MPFR_RNDN)
85 || i != -1)
86 {
87 printf("Overflow error (2).i=%d\ny=", i);
88 mpfr_dump (y);
89 exit (1);
90 }
91 MPFR_ASSERTN (!mpfr_overflow_p ());
92
93 set_emin (emin);
94 set_emax (emax);
95
96 mpfr_set_str_binary (x, "0.1E1000000000");
97 i = mpfr_tanh (y, x, MPFR_RNDN);
98 if (mpfr_cmp_ui (y, 1) || i != 1)
99 {
100 printf("Overflow error (3). i=%d\ny=", i);
101 mpfr_dump (y);
102 exit (1);
103 }
104 MPFR_ASSERTN (!mpfr_overflow_p ());
105 mpfr_set_str_binary (x, "-0.1E1000000000");
106 i = mpfr_tanh (y, x, MPFR_RNDU);
107 if (mpfr_cmp_str (y, "-0.111111111111111111111111E0", 2, MPFR_RNDN)
108 || i != 1)
109 {
110 printf("Overflow error (4). i=%d\ny=", i);
111 mpfr_dump (y);
112 exit (1);
113 }
114
115 mpfr_clear (y);
116 mpfr_clear (x);
117 }
118
119 /* This test was generated from bad_cases, with input y=-7.778@-1 = -3823/8192.
120 For the x value below, we have atanh(y) < x, thus since tanh() is increasing,
121 y < tanh(x), and thus tanh(x) rounded toward zero should give -3822/8192. */
122 static void
123 bug20171218 (void)
124 {
125 mpfr_t x, y, z;
126 mpfr_init2 (x, 813);
127 mpfr_init2 (y, 12);
128 mpfr_init2 (z, 12);
129 mpfr_set_str (x, "-8.17cd20bfc17ae00935dc3abad8e17ab43d3ef7740c320798eefb93191f4a62dba9a2daa5efb6eace21130abd87e3ee2eadd2ad8ddae883d2f2db5dee1ac7ce3c59d16eca09e2ca3f21dc2a0386c037a0d3972e62d5b6e82446032020705553c566b1df24f40@-1", 16, MPFR_RNDN);
130 mpfr_tanh (y, x, MPFR_RNDZ);
131 mpfr_set_str (z, "-7.770@-1", 16, MPFR_RNDN);
132 MPFR_ASSERTN(mpfr_equal_p (y, z));
133 mpfr_clear (x);
134 mpfr_clear (y);
135 mpfr_clear (z);
136 }
137
138 int
139 main (int argc, char *argv[])
140 {
141 tests_start_mpfr ();
142
143 bug20171218 ();
144 special_overflow ();
145 special ();
146
147 test_generic (MPFR_PREC_MIN, 100, 100);
148
149 data_check ("data/tanh", mpfr_tanh, "mpfr_tanh");
150 bad_cases (mpfr_tanh, mpfr_atanh, "mpfr_tanh", 256, -128, 0,
151 4, 128, 800, 100);
152
153 tests_end_mpfr ();
154 return 0;
155 }