1 /* $NetBSD: t_acos.c,v 1.11 2018/11/07 03:59:36 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <atf-c.h>
33 #include <math.h>
34 #include "t_libm.h"
35
36 /*
37 * acos(3) and acosf(3)
38 */
39
40 ATF_LIBM_TEST(acos_is_nan, "Test acos/acosf(x) == NaN, x = NaN, +/-Inf, ![-1..1]")
41 {
42 static const double x[] = {
43 -1.000000001, 1.000000001,
44 -1.0000001, 1.0000001,
45 -1.1, 1.1,
46 #ifndef __vax__
47 T_LIBM_NAN,
48 T_LIBM_MINUS_INF, T_LIBM_PLUS_INF,
49 #endif
50 };
51 unsigned int i;
52
53 for (i = 0; i < __arraycount(x); i++) {
54 T_LIBM_CHECK_NAN(i, acos, x[i]);
55 if (i < 2)
56 /* Values are too small for float */
57 continue;
58 T_LIBM_CHECK_NAN(i, acosf, x[i]);
59 }
60 }
61
62 ATF_LIBM_TEST(acos_inrange, "Test acos/acosf(x) for some valid values")
63 {
64 static const struct {
65 double x;
66 double y;
67 } values[] = {
68 { -1, M_PI, },
69 { -0.99, 3.000053180265366, },
70 { -0.5, 2.094395102393195, },
71 { -0.1, 1.670963747956456, },
72 { 0, M_PI / 2, },
73 { 0.1, 1.470628905633337, },
74 { 0.5, 1.047197551196598, },
75 { 0.99, 0.1415394733244273, },
76 };
77 unsigned int i;
78
79 /*
80 * Note that acos(x) might be calculated as atan2(sqrt(1-x*x),x).
81 * This means that acos(-1) is atan2(+0,-1), if the sign is wrong
82 * the value will be -M_PI (atan2(-0,-1)) not M_PI.
83 */
84
85 for (i = 0; i < __arraycount(values); i++) {
86 T_LIBM_CHECK(i, acos, values[i].x, values[i].y, 1.0e-15);
87 T_LIBM_CHECK(i, acosf, values[i].x, values[i].y, 1.0e-5);
88 }
89 }
90
91 ATF_LIBM_TEST(acos_is_plus_zero, "Test acosf(1.0) == +0.0")
92 {
93 T_LIBM_CHECK_PLUS_ZERO(0, acos, 1.0);
94 T_LIBM_CHECK_PLUS_ZERO(0, acosf, 1.0);
95 }
96
ATF_TP_ADD_TCS(tp)97 ATF_TP_ADD_TCS(tp)
98 {
99
100 ATF_TP_ADD_TC(tp, acos_inrange);
101 ATF_TP_ADD_TC(tp, acos_is_nan);
102 ATF_TP_ADD_TC(tp, acos_is_plus_zero);
103
104 return atf_no_error();
105 }
106