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      1 /* $NetBSD: t_atan.c,v 1.15 2014/03/17 11:08:11 martin 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 static const struct {
     37 	double x;
     38 	double y;
     39 } values[] = {
     40 #ifndef __vax__
     41 	/* vax has no +/- INF */
     42 	{ T_LIBM_MINUS_INF, -M_PI / 2 },
     43 	{ T_LIBM_PLUS_INF,   M_PI / 2 },
     44 #endif
     45 	{ -100, -1.560796660108231, },
     46 	{  -10, -1.471127674303735, },
     47 	{   -1, -M_PI / 4, },
     48 	{ -0.1, -0.09966865249116204, },
     49 	{  0.1,  0.09966865249116204, },
     50 	{    1,  M_PI / 4, },
     51 	{   10,  1.471127674303735, },
     52 	{  100,  1.560796660108231, },
     53 };
     54 
     55 /*
     56  * atan(3)
     57  */
     58 ATF_LIBM_TEST(atan_nan, "Test atan/atanf(NaN) == NaN")
     59 {
     60 #ifdef T_LIBM_NAN
     61 	T_LIBM_CHECK_NAN(0, atan, T_LIBM_NAN);
     62 	T_LIBM_CHECK_NAN(0, atanf, T_LIBM_NAN);
     63 #else
     64 	atf_tc_skip("no NaN on this machine");
     65 #endif
     66 }
     67 
     68 ATF_LIBM_TEST(atan_inrange, "Test atan/atanf(x) for some values")
     69 {
     70 	unsigned int i;
     71 
     72 	for (i = 0; i < __arraycount(values); i++) {
     73 		T_LIBM_CHECK(i, atan, values[i].x, values[i].y, 1.0e-15);
     74 		T_LIBM_CHECK(i, atanf, values[i].x, values[i].y, 1.0e-7);
     75 	}
     76 }
     77 
     78 ATF_LIBM_TEST(atan_zero_neg, "Test atan/atanf(-0.0) == -0.0")
     79 {
     80 
     81 	T_LIBM_CHECK_MINUS_ZERO(0, atan, -0.0);
     82 	T_LIBM_CHECK_MINUS_ZERO(0, atanf, -0.0);
     83 }
     84 
     85 ATF_LIBM_TEST(atan_zero_pos, "Test atan/atanf(+0.0) == +0.0")
     86 {
     87 
     88 	T_LIBM_CHECK_PLUS_ZERO(0, atan, +0.0);
     89 	T_LIBM_CHECK_PLUS_ZERO(0, atanf, +0.0);
     90 }
     91 
     92 ATF_TP_ADD_TCS(tp)
     93 {
     94 
     95 	ATF_TP_ADD_TC(tp, atan_nan);
     96 	ATF_TP_ADD_TC(tp, atan_inrange);
     97 	ATF_TP_ADD_TC(tp, atan_zero_neg);
     98 	ATF_TP_ADD_TC(tp, atan_zero_pos);
     99 
    100 	return atf_no_error();
    101 }
    102