t_ldexp.c revision 1.15
1 /* $NetBSD: t_ldexp.c,v 1.15 2016/08/25 00:26:01 maya 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 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: t_ldexp.c,v 1.15 2016/08/25 00:26:01 maya Exp $"); 33 34 #include <sys/param.h> 35 36 #include <atf-c.h> 37 38 #include <math.h> 39 #include <limits.h> 40 #include <stdio.h> 41 #include <string.h> 42 43 #define SKIP 9999 44 #define FORMAT "%23.23lg" 45 46 static const int exps[] = { 0, 1, -1, 100, -100 }; 47 48 struct ldexp_test { 49 double x; 50 int exp1; 51 int exp2; 52 const char *result; 53 }; 54 55 struct ldexp_test ldexp_basic[] = { 56 { 1.0, 5, SKIP, " 32" }, 57 { 1.0, 1022, SKIP, "4.4942328371557897693233e+307" }, 58 { 1.0, 1023, -1, "4.4942328371557897693233e+307" }, 59 { 1.0, 1023, SKIP, "8.9884656743115795386465e+307" }, 60 { 1.0, 1022, 1, "8.9884656743115795386465e+307" }, 61 { 1.0, -1022, 2045, "8.9884656743115795386465e+307" }, 62 { 1.0, -5, SKIP, " 0.03125" }, 63 { 1.0, -1021, SKIP, "4.4501477170144027661805e-308" }, 64 { 1.0, -1022, 1, "4.4501477170144027661805e-308" }, 65 { 1.0, -1022, SKIP, "2.2250738585072013830902e-308" }, 66 { 1.0, -1021, -1, "2.2250738585072013830902e-308" }, 67 { 1.0, 1023, -2045, "2.2250738585072013830902e-308" }, 68 { 1.0, 1023, -1023, " 1" }, 69 { 1.0, -1022, 1022, " 1" }, 70 { 0, 0, 0, NULL } 71 }; 72 73 struct ldexp_test ldexp_zero[] = { 74 { 0.0, -1, SKIP, " 0" }, 75 { 0.0, 0, SKIP, " 0" }, 76 { 0.0, 1, SKIP, " 0" }, 77 { 0.0, 1024, SKIP, " 0" }, 78 { 0.0, 1025, SKIP, " 0" }, 79 { 0.0, -1023, SKIP, " 0" }, 80 { 0.0, -1024, SKIP, " 0" }, 81 { 0, 0, 0, NULL } 82 }; 83 84 struct ldexp_test ldexp_infinity[] = { 85 { 1.0, 1024, -1, " inf" }, 86 { 1.0, 1024, 0, " inf" }, 87 { 1.0, 1024, 1, " inf" }, 88 { -1.0, 1024, -1, " -inf" }, 89 { -1.0, 1024, 0, " -inf" }, 90 { -1.0, 1024, 1, " -inf" }, 91 { 0, 0, 0, NULL } 92 }; 93 94 struct ldexp_test ldexp_overflow[] = { 95 { 1.0, 1024, SKIP, " inf" }, 96 { 1.0, 1023, 1, " inf" }, 97 { 1.0, -1022, 2046, " inf" }, 98 { 1.0, 1025, SKIP, " inf" }, 99 { -1.0, 1024, SKIP, " -inf" }, 100 { -1.0, 1023, 1, " -inf" }, 101 { -1.0, -1022, 2046, " -inf" }, 102 { -1.0, 1025, SKIP, " -inf" }, 103 { 0, 0, 0, NULL } 104 }; 105 106 struct ldexp_test ldexp_denormal[] = { 107 { 1.0, -1023, SKIP, "1.1125369292536006915451e-308" }, 108 { 1.0, -1022, -1, "1.1125369292536006915451e-308" }, 109 { 1.0, 1023, -2046, "1.1125369292536006915451e-308" }, 110 { 1.0, -1024, SKIP, "5.5626846462680034577256e-309" }, 111 { 1.0, -1074, SKIP, "4.9406564584124654417657e-324" }, 112 { -1.0, -1023, SKIP, "-1.1125369292536006915451e-308" }, 113 { -1.0, -1022, -1, "-1.1125369292536006915451e-308" }, 114 { -1.0, 1023, -2046, "-1.1125369292536006915451e-308" }, 115 { -1.0, -1024, SKIP, "-5.5626846462680034577256e-309" }, 116 { -1.0, -1074, SKIP, "-4.9406564584124654417657e-324" }, 117 { 0, 0, 0, NULL } 118 }; 119 120 struct ldexp_test ldexp_underflow[] = { 121 { 1.0, -1075, SKIP, " 0" }, 122 { 1.0, -1074, -1, " 0" }, 123 { 1.0, 1023, -2098, " 0" }, 124 { 1.0, -1076, SKIP, " 0" }, 125 { -1.0, -1075, SKIP, " -0" }, 126 { -1.0, -1074, -1, " -0" }, 127 { -1.0, 1023, -2098, " -0" }, 128 { -1.0, -1076, SKIP, " -0" }, 129 { 0, 0, 0, NULL } 130 }; 131 132 struct ldexp_test ldexp_denormal_large[] = { 133 { 1.0, -1028, 1024, " 0.0625" }, 134 { 1.0, -1028, 1025, " 0.125" }, 135 { 1.0, -1028, 1026, " 0.25" }, 136 { 1.0, -1028, 1027, " 0.5" }, 137 { 1.0, -1028, 1028, " 1" }, 138 { 1.0, -1028, 1029, " 2" }, 139 { 1.0, -1028, 1030, " 4" }, 140 { 1.0, -1028, 1040, " 4096" }, 141 { 1.0, -1028, 1050, " 4194304" }, 142 { 1.0, -1028, 1060, " 4294967296" }, 143 { 1.0, -1028, 1100, " 4722366482869645213696" }, 144 { 1.0, -1028, 1200, "5.9863107065073783529623e+51" }, 145 { 1.0, -1028, 1300, "7.5885503602567541832791e+81" }, 146 { 1.0, -1028, 1400, "9.6196304190416209014353e+111" }, 147 { 1.0, -1028, 1500, "1.2194330274671844653834e+142" }, 148 { 1.0, -1028, 1600, "1.5458150092069033378781e+172" }, 149 { 1.0, -1028, 1700, "1.9595533242629369747791e+202" }, 150 { 1.0, -1028, 1800, "2.4840289476811342962384e+232" }, 151 { 1.0, -1028, 1900, "3.1488807865122869393369e+262" }, 152 { 1.0, -1028, 2000, "3.9916806190694396233127e+292" }, 153 { 1.0, -1028, 2046, "2.808895523222368605827e+306" }, 154 { 1.0, -1028, 2047, "5.6177910464447372116541e+306" }, 155 { 1.0, -1028, 2048, "1.1235582092889474423308e+307" }, 156 { 1.0, -1028, 2049, "2.2471164185778948846616e+307" }, 157 { 1.0, -1028, 2050, "4.4942328371557897693233e+307" }, 158 { 1.0, -1028, 2051, "8.9884656743115795386465e+307" }, 159 { 0, 0, 0, NULL } 160 }; 161 162 static void 163 run_test(struct ldexp_test *table) 164 { 165 char outbuf[64]; 166 size_t i; 167 double v; 168 169 for (i = 0; table->result != NULL; table++, i++) { 170 171 v = ldexp(table->x, table->exp1); 172 173 if (table->exp2 != SKIP) 174 v = ldexp(v, table->exp2); 175 176 (void)snprintf(outbuf, sizeof(outbuf), FORMAT, v); 177 178 ATF_CHECK_STREQ_MSG(table->result, outbuf, 179 "Entry %zu:\n\tExp: \"%s\"\n\tAct: \"%s\"", 180 i, table->result, outbuf); 181 } 182 } 183 184 /* 185 * ldexp(3) 186 */ 187 ATF_TC(ldexp_exp2); 188 ATF_TC_HEAD(ldexp_exp2, tc) 189 { 190 atf_tc_set_md_var(tc, "descr", "Test ldexp(x, n) == x * exp2(n)"); 191 } 192 193 ATF_TC_BODY(ldexp_exp2, tc) 194 { 195 const double n[] = { 1, 2, 3, 10, 50, 100 }; 196 #if __DBL_MIN_10_EXP__ <= -40 197 const double eps = 1.0e-40; 198 #else 199 const double eps = __DBL_MIN__*4.0; 200 #endif 201 const double x = 12.0; 202 double y; 203 size_t i; 204 205 for (i = 0; i < __arraycount(n); i++) { 206 207 y = ldexp(x, n[i]); 208 209 if (fabs(y - (x * exp2(n[i]))) > eps) { 210 atf_tc_fail_nonfatal("ldexp(%0.01f, %0.01f) " 211 "!= %0.01f * exp2(%0.01f)", x, n[i], x, n[i]); 212 } 213 } 214 } 215 216 ATF_TC(ldexp_nan); 217 ATF_TC_HEAD(ldexp_nan, tc) 218 { 219 atf_tc_set_md_var(tc, "descr", "Test ldexp(NaN) == NaN"); 220 } 221 222 ATF_TC_BODY(ldexp_nan, tc) 223 { 224 const double x = 0.0L / 0.0L; 225 double y; 226 size_t i; 227 228 ATF_REQUIRE(isnan(x) != 0); 229 230 for (i = 0; i < __arraycount(exps); i++) { 231 y = ldexp(x, exps[i]); 232 ATF_CHECK(isnan(y) != 0); 233 } 234 } 235 236 ATF_TC(ldexp_inf_neg); 237 ATF_TC_HEAD(ldexp_inf_neg, tc) 238 { 239 atf_tc_set_md_var(tc, "descr", "Test ldexp(-Inf) == -Inf"); 240 } 241 242 ATF_TC_BODY(ldexp_inf_neg, tc) 243 { 244 const double x = -1.0L / 0.0L; 245 size_t i; 246 247 for (i = 0; i < __arraycount(exps); i++) 248 ATF_CHECK(ldexp(x, exps[i]) == x); 249 } 250 251 ATF_TC(ldexp_inf_pos); 252 ATF_TC_HEAD(ldexp_inf_pos, tc) 253 { 254 atf_tc_set_md_var(tc, "descr", "Test ldexp(+Inf) == +Inf"); 255 } 256 257 ATF_TC_BODY(ldexp_inf_pos, tc) 258 { 259 const double x = 1.0L / 0.0L; 260 size_t i; 261 262 for (i = 0; i < __arraycount(exps); i++) 263 ATF_CHECK(ldexp(x, exps[i]) == x); 264 } 265 266 ATF_TC(ldexp_zero_neg); 267 ATF_TC_HEAD(ldexp_zero_neg, tc) 268 { 269 atf_tc_set_md_var(tc, "descr", "Test ldexp(-0.0) == -0.0"); 270 } 271 272 ATF_TC_BODY(ldexp_zero_neg, tc) 273 { 274 const double x = -0.0L; 275 double y; 276 size_t i; 277 278 ATF_REQUIRE(signbit(x) != 0); 279 280 for (i = 0; i < __arraycount(exps); i++) { 281 y = ldexp(x, exps[i]); 282 ATF_CHECK(x == y); 283 ATF_CHECK(signbit(y) != 0); 284 } 285 } 286 287 ATF_TC(ldexp_zero_pos); 288 ATF_TC_HEAD(ldexp_zero_pos, tc) 289 { 290 atf_tc_set_md_var(tc, "descr", "Test ldexp(+0.0) == +0.0"); 291 } 292 293 ATF_TC_BODY(ldexp_zero_pos, tc) 294 { 295 const double x = 0.0L; 296 double y; 297 size_t i; 298 299 ATF_REQUIRE(signbit(x) == 0); 300 301 for (i = 0; i < __arraycount(exps); i++) { 302 y = ldexp(x, exps[i]); 303 ATF_CHECK(x == y); 304 ATF_CHECK(signbit(y) == 0); 305 } 306 } 307 308 /* 309 * ldexpf(3) 310 */ 311 312 ATF_TC(ldexpf_exp2f); 313 ATF_TC_HEAD(ldexpf_exp2f, tc) 314 { 315 atf_tc_set_md_var(tc, "descr", "Test ldexpf(x, n) == x * exp2f(n)"); 316 } 317 318 ATF_TC_BODY(ldexpf_exp2f, tc) 319 { 320 const float n[] = { 1, 2, 3, 10, 50, 100 }; 321 const float eps = 1.0e-9; 322 const float x = 12.0; 323 float y; 324 size_t i; 325 326 for (i = 0; i < __arraycount(n); i++) { 327 328 y = ldexpf(x, n[i]); 329 330 if (fabsf(y - (x * exp2f(n[i]))) > eps) { 331 atf_tc_fail_nonfatal("ldexpf(%0.01f, %0.01f) " 332 "!= %0.01f * exp2f(%0.01f)", x, n[i], x, n[i]); 333 } 334 } 335 } 336 337 ATF_TC(ldexpf_nan); 338 ATF_TC_HEAD(ldexpf_nan, tc) 339 { 340 atf_tc_set_md_var(tc, "descr", "Test ldexpf(NaN) == NaN"); 341 } 342 343 ATF_TC_BODY(ldexpf_nan, tc) 344 { 345 const float x = 0.0L / 0.0L; 346 float y; 347 size_t i; 348 349 ATF_REQUIRE(isnan(x) != 0); 350 351 for (i = 0; i < __arraycount(exps); i++) { 352 y = ldexpf(x, exps[i]); 353 ATF_CHECK(isnan(y) != 0); 354 } 355 } 356 357 ATF_TC(ldexpf_inf_neg); 358 ATF_TC_HEAD(ldexpf_inf_neg, tc) 359 { 360 atf_tc_set_md_var(tc, "descr", "Test ldexpf(-Inf) == -Inf"); 361 } 362 363 ATF_TC_BODY(ldexpf_inf_neg, tc) 364 { 365 const float x = -1.0L / 0.0L; 366 size_t i; 367 368 for (i = 0; i < __arraycount(exps); i++) 369 ATF_CHECK(ldexpf(x, exps[i]) == x); 370 } 371 372 ATF_TC(ldexpf_inf_pos); 373 ATF_TC_HEAD(ldexpf_inf_pos, tc) 374 { 375 atf_tc_set_md_var(tc, "descr", "Test ldexpf(+Inf) == +Inf"); 376 } 377 378 ATF_TC_BODY(ldexpf_inf_pos, tc) 379 { 380 const float x = 1.0L / 0.0L; 381 size_t i; 382 383 for (i = 0; i < __arraycount(exps); i++) 384 ATF_CHECK(ldexpf(x, exps[i]) == x); 385 } 386 387 ATF_TC(ldexpf_zero_neg); 388 ATF_TC_HEAD(ldexpf_zero_neg, tc) 389 { 390 atf_tc_set_md_var(tc, "descr", "Test ldexpf(-0.0) == -0.0"); 391 } 392 393 ATF_TC_BODY(ldexpf_zero_neg, tc) 394 { 395 const float x = -0.0L; 396 float y; 397 size_t i; 398 399 ATF_REQUIRE(signbit(x) != 0); 400 401 for (i = 0; i < __arraycount(exps); i++) { 402 y = ldexpf(x, exps[i]); 403 ATF_CHECK(x == y); 404 ATF_CHECK(signbit(y) != 0); 405 } 406 } 407 408 ATF_TC(ldexpf_zero_pos); 409 ATF_TC_HEAD(ldexpf_zero_pos, tc) 410 { 411 atf_tc_set_md_var(tc, "descr", "Test ldexpf(+0.0) == +0.0"); 412 } 413 414 ATF_TC_BODY(ldexpf_zero_pos, tc) 415 { 416 const float x = 0.0L; 417 float y; 418 size_t i; 419 420 ATF_REQUIRE(signbit(x) == 0); 421 422 for (i = 0; i < __arraycount(exps); i++) { 423 y = ldexpf(x, exps[i]); 424 ATF_CHECK(x == y); 425 ATF_CHECK(signbit(y) == 0); 426 } 427 } 428 429 #define TEST(name, desc) \ 430 ATF_TC(name); \ 431 ATF_TC_HEAD(name, tc) \ 432 { \ 433 \ 434 atf_tc_set_md_var(tc, "descr", \ 435 "Test ldexp(3) for " ___STRING(desc)); \ 436 } \ 437 ATF_TC_BODY(name, tc) \ 438 { \ 439 if (strcmp("vax", MACHINE_ARCH) == 0) \ 440 atf_tc_skip("Test not valid for " MACHINE_ARCH); \ 441 run_test(name); \ 442 } 443 444 TEST(ldexp_basic, basics) 445 TEST(ldexp_zero, zero) 446 TEST(ldexp_infinity, infinity) 447 TEST(ldexp_overflow, overflow) 448 TEST(ldexp_denormal, denormal) 449 TEST(ldexp_denormal_large, large) 450 TEST(ldexp_underflow, underflow) 451 452 ATF_TP_ADD_TCS(tp) 453 { 454 455 ATF_TP_ADD_TC(tp, ldexp_basic); 456 ATF_TP_ADD_TC(tp, ldexp_zero); 457 ATF_TP_ADD_TC(tp, ldexp_infinity); 458 ATF_TP_ADD_TC(tp, ldexp_overflow); 459 ATF_TP_ADD_TC(tp, ldexp_denormal); 460 ATF_TP_ADD_TC(tp, ldexp_underflow); 461 ATF_TP_ADD_TC(tp, ldexp_denormal_large); 462 463 ATF_TP_ADD_TC(tp, ldexp_exp2); 464 ATF_TP_ADD_TC(tp, ldexp_nan); 465 ATF_TP_ADD_TC(tp, ldexp_inf_neg); 466 ATF_TP_ADD_TC(tp, ldexp_inf_pos); 467 ATF_TP_ADD_TC(tp, ldexp_zero_neg); 468 ATF_TP_ADD_TC(tp, ldexp_zero_pos); 469 470 ATF_TP_ADD_TC(tp, ldexpf_exp2f); 471 ATF_TP_ADD_TC(tp, ldexpf_nan); 472 ATF_TP_ADD_TC(tp, ldexpf_inf_neg); 473 ATF_TP_ADD_TC(tp, ldexpf_inf_pos); 474 ATF_TP_ADD_TC(tp, ldexpf_zero_neg); 475 ATF_TP_ADD_TC(tp, ldexpf_zero_pos); 476 477 return atf_no_error(); 478 } 479
Indexes created Fri Sep 26 20:09:58 GMT 2025