tests/lib/libm/t_atan.c

   1 /* $NetBSD: t_atan.c,v 1.9 2013/06/14 05:39:28 isaki 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
  35 static const struct {
  36         double x;
  37         double y;
  38 } values[] = {
  39         { -100, -1.560796660108231, },
  40         {  -10, -1.471127674303735, },
  41         {   -1, -M_PI / 4, },
  42         { -0.1, -0.09966865249116204, },
  43         {  0.1,  0.09966865249116204, },
  44         {    1,  M_PI / 4, },
  45         {   10,  1.471127674303735, },
  46         {  100,  1.560796660108231, },
  47 };
  48
  49 /*
  50  * atan(3)
  51  */
  52 ATF_TC(atan_nan);
  53 ATF_TC_HEAD(atan_nan, tc)
  54 {
  55         atf_tc_set_md_var(tc, "descr", "Test atan(NaN) == NaN");
  56 }
  57
  58 ATF_TC_BODY(atan_nan, tc)
  59 {
  60 #ifndef __vax__
  61         const double x = 0.0L / 0.0L;
  62
  63         if (isnan(atan(x)) == 0)
  64                 atf_tc_fail_nonfatal("atan(NaN) != NaN");
  65 #endif
  66 }
  67
  68 ATF_TC(atan_inf_neg);
  69 ATF_TC_HEAD(atan_inf_neg, tc)
  70 {
  71         atf_tc_set_md_var(tc, "descr", "Test atan(-Inf) == -pi/2");
  72 }
  73
  74 ATF_TC_BODY(atan_inf_neg, tc)
  75 {
  76 #ifndef __vax__
  77         const double x = -1.0L / 0.0L;
  78         const double eps = 1.0e-15;
  79
  80         if (fabs(atan(x) + M_PI_2) > eps)
  81                 atf_tc_fail_nonfatal("atan(-Inf) != -pi/2");
  82 #endif
  83 }
  84
  85 ATF_TC(atan_inf_pos);
  86 ATF_TC_HEAD(atan_inf_pos, tc)
  87 {
  88         atf_tc_set_md_var(tc, "descr", "Test atan(+Inf) == pi/2");
  89 }
  90
  91 ATF_TC_BODY(atan_inf_pos, tc)
  92 {
  93 #ifndef __vax__
  94         const double x = +1.0L / 0.0L;
  95         const double eps = 1.0e-15;
  96
  97         if (fabs(atan(x) - M_PI_2) > eps)
  98                 atf_tc_fail_nonfatal("atan(+Inf) != pi/2");
  99 #endif
 100 }
 101
 102 ATF_TC(atan_inrange);
 103 ATF_TC_HEAD(atan_inrange, tc)
 104 {
 105         atf_tc_set_md_var(tc, "descr", "Test atan(x) for some values");
 106 }
 107
 108 ATF_TC_BODY(atan_inrange, tc)
 109 {
 110 #ifndef __vax__
 111         const double eps = 1.0e-15;
 112         size_t i;
 113
 114         for (i = 0; i < __arraycount(values); i++) {
 115                 if (fabs(atan(values[i].x) - values[i].y) > eps)
 116                         atf_tc_fail_nonfatal("atan(%g) != %g",
 117                                 values[i].x, values[i].y);
 118         }
 119 #endif
 120 }
 121
 122 ATF_TC(atan_zero_neg);
 123 ATF_TC_HEAD(atan_zero_neg, tc)
 124 {
 125         atf_tc_set_md_var(tc, "descr", "Test atan(-0.0) == -0.0");
 126 }
 127
 128 ATF_TC_BODY(atan_zero_neg, tc)
 129 {
 130 #ifndef __vax__
 131         const double x = -0.0L;
 132         double y = atan(x);
 133
 134         if (fabs(y) > 0.0 || signbit(y) == 0)
 135                 atf_tc_fail_nonfatal("atan(-0.0) != -0.0");
 136 #endif
 137 }
 138
 139 ATF_TC(atan_zero_pos);
 140 ATF_TC_HEAD(atan_zero_pos, tc)
 141 {
 142         atf_tc_set_md_var(tc, "descr", "Test atan(+0.0) == +0.0");
 143 }
 144
 145 ATF_TC_BODY(atan_zero_pos, tc)
 146 {
 147 #ifndef __vax__
 148         const double x = 0.0L;
 149         double y = atan(x);
 150
 151         if (fabs(y) > 0.0 || signbit(y) != 0)
 152                 atf_tc_fail_nonfatal("atan(+0.0) != +0.0");
 153 #endif
 154 }
 155
 156 /*
 157  * atanf(3)
 158  */
 159 ATF_TC(atanf_nan);
 160 ATF_TC_HEAD(atanf_nan, tc)
 161 {
 162         atf_tc_set_md_var(tc, "descr", "Test atanf(NaN) == NaN");
 163 }
 164
 165 ATF_TC_BODY(atanf_nan, tc)
 166 {
 167 #ifndef __vax__
 168         const float x = 0.0L / 0.0L;
 169
 170         if (isnan(atanf(x)) == 0)
 171                 atf_tc_fail_nonfatal("atanf(NaN) != NaN");
 172 #endif
 173 }
 174
 175 ATF_TC(atanf_inf_neg);
 176 ATF_TC_HEAD(atanf_inf_neg, tc)
 177 {
 178         atf_tc_set_md_var(tc, "descr", "Test atanf(-Inf) == -pi/2");
 179 }
 180
 181 ATF_TC_BODY(atanf_inf_neg, tc)
 182 {
 183 #ifndef __vax__
 184         const float x = -1.0L / 0.0L;
 185         const float eps = 1.0e-7;
 186
 187         if (fabsf(atanf(x) + M_PI_2) > eps)
 188                 atf_tc_fail_nonfatal("atanf(-Inf) != -pi/2");
 189 #endif
 190 }
 191
 192 ATF_TC(atanf_inf_pos);
 193 ATF_TC_HEAD(atanf_inf_pos, tc)
 194 {
 195         atf_tc_set_md_var(tc, "descr", "Test atanf(+Inf) == pi/2");
 196 }
 197
 198 ATF_TC_BODY(atanf_inf_pos, tc)
 199 {
 200 #ifndef __vax__
 201         const float x = +1.0L / 0.0L;
 202         const float eps = 1.0e-7;
 203
 204         if (fabsf(atanf(x) - M_PI_2) > eps)
 205                 atf_tc_fail_nonfatal("atanf(+Inf) != pi/2");
 206 #endif
 207 }
 208
 209 ATF_TC(atanf_inrange);
 210 ATF_TC_HEAD(atanf_inrange, tc)
 211 {
 212         atf_tc_set_md_var(tc, "descr", "Test atanf(x) for some values");
 213 }
 214
 215 ATF_TC_BODY(atanf_inrange, tc)
 216 {
 217 #ifndef __vax__
 218         const float eps = 1.0e-7;
 219         float x;
 220         float y;
 221         size_t i;
 222
 223         for (i = 0; i < __arraycount(values); i++) {
 224                 x = values[i].x;
 225                 y = values[i].y;
 226                 if (fabs(atanf(x) - y) > eps)
 227                         atf_tc_fail_nonfatal("atan(%g) != %g", x, y);
 228         }
 229 #endif
 230 }
 231
 232 ATF_TC(atanf_zero_neg);
 233 ATF_TC_HEAD(atanf_zero_neg, tc)
 234 {
 235         atf_tc_set_md_var(tc, "descr", "Test atanf(-0.0) == -0.0");
 236 }
 237
 238 ATF_TC_BODY(atanf_zero_neg, tc)
 239 {
 240 #ifndef __vax__
 241         const float x = -0.0L;
 242         float y = atanf(x);
 243
 244         if (fabsf(y) > 0.0 || signbit(y) == 0)
 245                 atf_tc_fail_nonfatal("atanf(-0.0) != -0.0");
 246 #endif
 247 }
 248
 249 ATF_TC(atanf_zero_pos);
 250 ATF_TC_HEAD(atanf_zero_pos, tc)
 251 {
 252         atf_tc_set_md_var(tc, "descr", "Test atanf(+0.0) == +0.0");
 253 }
 254
 255 ATF_TC_BODY(atanf_zero_pos, tc)
 256 {
 257 #ifndef __vax__
 258         const float x = 0.0L;
 259         float y = atanf(x);
 260
 261         if (fabsf(y) > 0.0 || signbit(y) != 0)
 262                 atf_tc_fail_nonfatal("atanf(+0.0) != +0.0");
 263 #endif
 264 }
 265
 266 ATF_TP_ADD_TCS(tp)
 267 {
 268
 269         ATF_TP_ADD_TC(tp, atan_nan);
 270         ATF_TP_ADD_TC(tp, atan_inf_neg);
 271         ATF_TP_ADD_TC(tp, atan_inf_pos);
 272         ATF_TP_ADD_TC(tp, atan_inrange);
 273         ATF_TP_ADD_TC(tp, atan_zero_neg);
 274         ATF_TP_ADD_TC(tp, atan_zero_pos);
 275
 276         ATF_TP_ADD_TC(tp, atanf_nan);
 277         ATF_TP_ADD_TC(tp, atanf_inf_neg);
 278         ATF_TP_ADD_TC(tp, atanf_inf_pos);
 279         ATF_TP_ADD_TC(tp, atanf_inrange);
 280         ATF_TP_ADD_TC(tp, atanf_zero_neg);
 281         ATF_TP_ADD_TC(tp, atanf_zero_pos);
 282
 283         return atf_no_error();
 284 }