t_acos.c revision 272458 
1/* $NetBSD: t_acos.c,v 1.10 2014/03/05 20:14:46 dsl 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
40ATF_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
62ATF_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, 0.141539473324427, },
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
91ATF_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
97ATF_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