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/* $NetBSD: t_acos.c,v 1.10 2014/03/05 20:14:46 dsl Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jukka Ruohonen.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <atf-c.h>
#include <math.h>
#include "t_libm.h"
/*
* acos(3) and acosf(3)
*/
ATF_LIBM_TEST(acos_is_nan, "Test acos/acosf(x) == NaN, x = NaN, +/-Inf, ![-1..1]")
{
static const double x[] = {
-1.000000001, 1.000000001,
-1.0000001, 1.0000001,
-1.1, 1.1,
#ifndef __vax__
T_LIBM_NAN,
T_LIBM_MINUS_INF, T_LIBM_PLUS_INF,
#endif
};
unsigned int i;
for (i = 0; i < __arraycount(x); i++) {
T_LIBM_CHECK_NAN(i, acos, x[i]);
if (i < 2)
/* Values are too small for float */
continue;
T_LIBM_CHECK_NAN(i, acosf, x[i]);
}
}
ATF_LIBM_TEST(acos_inrange, "Test acos/acosf(x) for some valid values")
{
static const struct {
double x;
double y;
} values[] = {
{ -1, M_PI, },
{ -0.99, 3.000053180265366, },
{ -0.5, 2.094395102393195, },
{ -0.1, 1.670963747956456, },
{ 0, M_PI / 2, },
{ 0.1, 1.470628905633337, },
{ 0.5, 1.047197551196598, },
{ 0.99, 0.141539473324427, },
};
unsigned int i;
/*
* Note that acos(x) might be calculated as atan2(sqrt(1-x*x),x).
* This means that acos(-1) is atan2(+0,-1), if the sign is wrong
* the value will be -M_PI (atan2(-0,-1)) not M_PI.
*/
for (i = 0; i < __arraycount(values); i++) {
T_LIBM_CHECK(i, acos, values[i].x, values[i].y, 1.0e-15);
T_LIBM_CHECK(i, acosf, values[i].x, values[i].y, 1.0e-5);
}
}
ATF_LIBM_TEST(acos_is_plus_zero, "Test acosf(1.0) == +0.0")
{
T_LIBM_CHECK_PLUS_ZERO(0, acos, 1.0);
T_LIBM_CHECK_PLUS_ZERO(0, acosf, 1.0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, acos_inrange);
ATF_TP_ADD_TC(tp, acos_is_nan);
ATF_TP_ADD_TC(tp, acos_is_plus_zero);
return atf_no_error();
}
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