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 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, 0.141539473324427, }, 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 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 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