tests/lib/libm/t_atan.c

   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 }