t_scalbn.c revision 1.15
1 /* $NetBSD: t_scalbn.c,v 1.15 2018/06/03 08:39:00 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_scalbn.c,v 1.15 2018/06/03 08:39:00 maya Exp $"); 33 34 #include <math.h> 35 #include <limits.h> 36 #include <float.h> 37 #include <errno.h> 38 #include <fenv.h> 39 40 #include <atf-c.h> 41 42 static const int exps[] = { 0, 1, -1, 100, -100 }; 43 44 /* tests here do not require specific precision, so we just use double */ 45 struct testcase { 46 int exp; 47 double inval; 48 double result; 49 int error; 50 int except; 51 }; 52 struct testcase test_vals[] = { 53 { 0, 1.00085, 1.00085, 0, 0 }, 54 { 0, 0.99755, 0.99755, 0, 0 }, 55 { 0, -1.00085, -1.00085, 0, 0 }, 56 { 0, -0.99755, -0.99755, 0, 0 }, 57 { 1, 1.00085, 2.0* 1.00085, 0, 0 }, 58 { 1, 0.99755, 2.0* 0.99755, 0, 0 }, 59 { 1, -1.00085, 2.0* -1.00085, 0, 0 }, 60 { 1, -0.99755, 2.0* -0.99755, 0, 0 }, 61 62 /* 63 * We could add more corner test cases here, but we would have to 64 * add some ifdefs for the exact format and use a reliable 65 * generator program - bail for now and only do trivial stuff above. 66 */ 67 }; 68 69 /* 70 * scalbn(3) 71 */ 72 ATF_TC(scalbn_val); 73 ATF_TC_HEAD(scalbn_val, tc) 74 { 75 atf_tc_set_md_var(tc, "descr", "Test scalbn() for a few values"); 76 } 77 78 ATF_TC_BODY(scalbn_val, tc) 79 { 80 const struct testcase *tests = test_vals; 81 const size_t tcnt = __arraycount(test_vals); 82 size_t i; 83 double rv; 84 85 for (i = 0; i < tcnt; i++) { 86 errno = 0; 87 #ifndef __vax__ 88 feclearexcept(FE_ALL_EXCEPT); 89 #endif 90 rv = scalbn(tests[i].inval, tests[i].exp); 91 ATF_CHECK_EQ_MSG(errno, tests[i].error, 92 "test %zu: errno %d instead of %d", i, errno, 93 tests[i].error); 94 #ifndef __vax__ 95 ATF_CHECK_EQ_MSG(errno, tests[i].error, 96 "test %zu: fetestexcept %d instead of %d", i, 97 fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW), 98 tests[i].except); 99 #endif 100 ATF_CHECK_MSG(fabs(rv-tests[i].result)<2.0*DBL_EPSILON, 101 "test %zu: return value %g instead of %g (difference %g)", 102 i, rv, tests[i].result, tests[i].result-rv); 103 } 104 } 105 106 ATF_TC(scalbn_nan); 107 ATF_TC_HEAD(scalbn_nan, tc) 108 { 109 atf_tc_set_md_var(tc, "descr", "Test scalbn(NaN, n) == NaN"); 110 } 111 112 ATF_TC_BODY(scalbn_nan, tc) 113 { 114 const double x = 0.0L / 0.0L; 115 double y; 116 size_t i; 117 118 ATF_REQUIRE(isnan(x) != 0); 119 120 for (i = 0; i < __arraycount(exps); i++) { 121 y = scalbn(x, exps[i]); 122 ATF_CHECK(isnan(y) != 0); 123 } 124 } 125 126 ATF_TC(scalbn_inf_neg); 127 ATF_TC_HEAD(scalbn_inf_neg, tc) 128 { 129 atf_tc_set_md_var(tc, "descr", "Test scalbn(-Inf, n) == -Inf"); 130 } 131 132 ATF_TC_BODY(scalbn_inf_neg, tc) 133 { 134 const double x = -1.0L / 0.0L; 135 size_t i; 136 137 for (i = 0; i < __arraycount(exps); i++) 138 ATF_CHECK(scalbn(x, exps[i]) == x); 139 } 140 141 ATF_TC(scalbn_inf_pos); 142 ATF_TC_HEAD(scalbn_inf_pos, tc) 143 { 144 atf_tc_set_md_var(tc, "descr", "Test scalbn(+Inf, n) == +Inf"); 145 } 146 147 ATF_TC_BODY(scalbn_inf_pos, tc) 148 { 149 const double x = 1.0L / 0.0L; 150 size_t i; 151 152 for (i = 0; i < __arraycount(exps); i++) 153 ATF_CHECK(scalbn(x, exps[i]) == x); 154 } 155 156 ATF_TC(scalbn_ldexp); 157 ATF_TC_HEAD(scalbn_ldexp, tc) 158 { 159 atf_tc_set_md_var(tc, "descr", "Test scalbn(x, n) == ldexp(x, n)"); 160 } 161 162 ATF_TC_BODY(scalbn_ldexp, tc) 163 { 164 #if FLT_RADIX == 2 165 const double x = 2.91288191221812821; 166 double y; 167 size_t i; 168 169 for (i = 0; i < __arraycount(exps); i++) { 170 y = scalbn(x, exps[i]); 171 ATF_CHECK_MSG(y == ldexp(x, exps[i]), "test %zu: exponent=%d, " 172 "y=%g, expected %g (diff: %g)", i, exps[i], y, 173 ldexp(x, exps[i]), y - ldexp(x, exps[i])); 174 } 175 #endif 176 } 177 178 ATF_TC(scalbn_zero_neg); 179 ATF_TC_HEAD(scalbn_zero_neg, tc) 180 { 181 atf_tc_set_md_var(tc, "descr", "Test scalbn(-0.0, n) == -0.0"); 182 } 183 184 ATF_TC_BODY(scalbn_zero_neg, tc) 185 { 186 const double x = -0.0L; 187 double y; 188 size_t i; 189 190 ATF_REQUIRE(signbit(x) != 0); 191 192 for (i = 0; i < __arraycount(exps); i++) { 193 y = scalbn(x, exps[i]); 194 ATF_CHECK(x == y); 195 ATF_CHECK(signbit(y) != 0); 196 } 197 } 198 199 ATF_TC(scalbn_zero_pos); 200 ATF_TC_HEAD(scalbn_zero_pos, tc) 201 { 202 atf_tc_set_md_var(tc, "descr", "Test scalbn(+0.0, n) == +0.0"); 203 } 204 205 ATF_TC_BODY(scalbn_zero_pos, tc) 206 { 207 const double x = 0.0L; 208 double y; 209 size_t i; 210 211 ATF_REQUIRE(signbit(x) == 0); 212 213 for (i = 0; i < __arraycount(exps); i++) { 214 y = scalbn(x, exps[i]); 215 ATF_CHECK(x == y); 216 ATF_CHECK(signbit(y) == 0); 217 } 218 } 219 220 /* 221 * scalbnf(3) 222 */ 223 ATF_TC(scalbnf_val); 224 ATF_TC_HEAD(scalbnf_val, tc) 225 { 226 atf_tc_set_md_var(tc, "descr", "Test scalbnf() for a few values"); 227 } 228 229 ATF_TC_BODY(scalbnf_val, tc) 230 { 231 const struct testcase *tests = test_vals; 232 const size_t tcnt = __arraycount(test_vals); 233 size_t i; 234 double rv; 235 236 for (i = 0; i < tcnt; i++) { 237 errno = 0; 238 rv = scalbnf(tests[i].inval, tests[i].exp); 239 ATF_CHECK_EQ_MSG(errno, tests[i].error, 240 "test %zu: errno %d instead of %d", i, errno, 241 tests[i].error); 242 ATF_CHECK_MSG(fabs(rv-tests[i].result)<2.0*FLT_EPSILON, 243 "test %zu: return value %g instead of %g (difference %g)", 244 i, rv, tests[i].result, tests[i].result-rv); 245 } 246 } 247 248 ATF_TC(scalbnf_nan); 249 ATF_TC_HEAD(scalbnf_nan, tc) 250 { 251 atf_tc_set_md_var(tc, "descr", "Test scalbnf(NaN, n) == NaN"); 252 } 253 254 ATF_TC_BODY(scalbnf_nan, tc) 255 { 256 const float x = 0.0L / 0.0L; 257 float y; 258 size_t i; 259 260 ATF_REQUIRE(isnan(x) != 0); 261 262 for (i = 0; i < __arraycount(exps); i++) { 263 y = scalbnf(x, exps[i]); 264 ATF_CHECK(isnan(y) != 0); 265 } 266 } 267 268 ATF_TC(scalbnf_inf_neg); 269 ATF_TC_HEAD(scalbnf_inf_neg, tc) 270 { 271 atf_tc_set_md_var(tc, "descr", "Test scalbnf(-Inf, n) == -Inf"); 272 } 273 274 ATF_TC_BODY(scalbnf_inf_neg, tc) 275 { 276 const float x = -1.0L / 0.0L; 277 size_t i; 278 279 for (i = 0; i < __arraycount(exps); i++) 280 ATF_CHECK(scalbnf(x, exps[i]) == x); 281 } 282 283 ATF_TC(scalbnf_inf_pos); 284 ATF_TC_HEAD(scalbnf_inf_pos, tc) 285 { 286 atf_tc_set_md_var(tc, "descr", "Test scalbnf(+Inf, n) == +Inf"); 287 } 288 289 ATF_TC_BODY(scalbnf_inf_pos, tc) 290 { 291 const float x = 1.0L / 0.0L; 292 size_t i; 293 294 for (i = 0; i < __arraycount(exps); i++) 295 ATF_CHECK(scalbnf(x, exps[i]) == x); 296 } 297 298 ATF_TC(scalbnf_ldexpf); 299 ATF_TC_HEAD(scalbnf_ldexpf, tc) 300 { 301 atf_tc_set_md_var(tc, "descr", "Test scalbnf(x, n) == ldexpf(x, n)"); 302 } 303 304 ATF_TC_BODY(scalbnf_ldexpf, tc) 305 { 306 #if FLT_RADIX == 2 307 const float x = 2.91288191221812821; 308 float y; 309 size_t i; 310 311 for (i = 0; i < __arraycount(exps); i++) { 312 y = scalbnf(x, exps[i]); 313 ATF_CHECK_MSG(y == ldexpf(x, exps[i]), 314 "test %zu: exponent=%d, y=%g ldexpf returns %g (diff: %g)", 315 i, exps[i], y, ldexpf(x, exps[i]), y-ldexpf(x, exps[i])); 316 } 317 #endif 318 } 319 320 ATF_TC(scalbnf_zero_neg); 321 ATF_TC_HEAD(scalbnf_zero_neg, tc) 322 { 323 atf_tc_set_md_var(tc, "descr", "Test scalbnf(-0.0, n) == -0.0"); 324 } 325 326 ATF_TC_BODY(scalbnf_zero_neg, tc) 327 { 328 const float x = -0.0L; 329 float y; 330 size_t i; 331 332 ATF_REQUIRE(signbit(x) != 0); 333 334 for (i = 0; i < __arraycount(exps); i++) { 335 y = scalbnf(x, exps[i]); 336 ATF_CHECK(x == y); 337 ATF_CHECK(signbit(y) != 0); 338 } 339 } 340 341 ATF_TC(scalbnf_zero_pos); 342 ATF_TC_HEAD(scalbnf_zero_pos, tc) 343 { 344 atf_tc_set_md_var(tc, "descr", "Test scalbnf(+0.0, n) == +0.0"); 345 } 346 347 ATF_TC_BODY(scalbnf_zero_pos, tc) 348 { 349 const float x = 0.0L; 350 float y; 351 size_t i; 352 353 ATF_REQUIRE(signbit(x) == 0); 354 355 for (i = 0; i < __arraycount(exps); i++) { 356 y = scalbnf(x, exps[i]); 357 ATF_CHECK(x == y); 358 ATF_CHECK(signbit(y) == 0); 359 } 360 } 361 362 /* 363 * scalbnl(3) 364 */ 365 ATF_TC(scalbnl_val); 366 ATF_TC_HEAD(scalbnl_val, tc) 367 { 368 atf_tc_set_md_var(tc, "descr", "Test scalbnl() for a few values"); 369 } 370 371 ATF_TC_BODY(scalbnl_val, tc) 372 { 373 #ifndef __HAVE_LONG_DOUBLE 374 atf_tc_skip("Requires long double support"); 375 #else 376 const struct testcase *tests = test_vals; 377 const size_t tcnt = __arraycount(test_vals); 378 size_t i; 379 long double rv; 380 381 for (i = 0; i < tcnt; i++) { 382 errno = 0; 383 rv = scalbnl(tests[i].inval, tests[i].exp); 384 ATF_CHECK_EQ_MSG(errno, tests[i].error, 385 "test %zu: errno %d instead of %d", i, errno, 386 tests[i].error); 387 ATF_CHECK_MSG(fabsl(rv-(long double)tests[i].result)<2.0*LDBL_EPSILON, 388 "test %zu: return value %Lg instead of %Lg (difference %Lg)", 389 i, rv, (long double)tests[i].result, (long double)tests[i].result-rv); 390 } 391 #endif 392 } 393 394 ATF_TC(scalbnl_nan); 395 ATF_TC_HEAD(scalbnl_nan, tc) 396 { 397 atf_tc_set_md_var(tc, "descr", "Test scalbnl(NaN, n) == NaN"); 398 } 399 400 ATF_TC_BODY(scalbnl_nan, tc) 401 { 402 #ifndef __HAVE_LONG_DOUBLE 403 atf_tc_skip("Requires long double support"); 404 #else 405 const long double x = 0.0L / 0.0L; 406 long double y; 407 size_t i; 408 409 if (isnan(x) == 0) { 410 atf_tc_expect_fail("PR lib/45362"); 411 atf_tc_fail("(0.0L / 0.0L) != NaN"); 412 } 413 414 for (i = 0; i < __arraycount(exps); i++) { 415 y = scalbnl(x, exps[i]); 416 ATF_CHECK(isnan(y) != 0); 417 } 418 #endif 419 } 420 421 ATF_TC(scalbnl_inf_neg); 422 ATF_TC_HEAD(scalbnl_inf_neg, tc) 423 { 424 atf_tc_set_md_var(tc, "descr", "Test scalbnl(-Inf, n) == -Inf"); 425 } 426 427 ATF_TC_BODY(scalbnl_inf_neg, tc) 428 { 429 #ifndef __HAVE_LONG_DOUBLE 430 atf_tc_skip("Requires long double support"); 431 #else 432 const long double x = -1.0L / 0.0L; 433 size_t i; 434 435 for (i = 0; i < __arraycount(exps); i++) 436 ATF_CHECK(scalbnl(x, exps[i]) == x); 437 #endif 438 } 439 440 ATF_TC(scalbnl_inf_pos); 441 ATF_TC_HEAD(scalbnl_inf_pos, tc) 442 { 443 atf_tc_set_md_var(tc, "descr", "Test scalbnl(+Inf, n) == +Inf"); 444 } 445 446 ATF_TC_BODY(scalbnl_inf_pos, tc) 447 { 448 #ifndef __HAVE_LONG_DOUBLE 449 atf_tc_skip("Requires long double support"); 450 #else 451 const long double x = 1.0L / 0.0L; 452 size_t i; 453 454 for (i = 0; i < __arraycount(exps); i++) 455 ATF_CHECK(scalbnl(x, exps[i]) == x); 456 #endif 457 } 458 459 ATF_TC(scalbnl_zero_neg); 460 ATF_TC_HEAD(scalbnl_zero_neg, tc) 461 { 462 atf_tc_set_md_var(tc, "descr", "Test scalbnl(-0.0, n) == -0.0"); 463 } 464 465 ATF_TC_BODY(scalbnl_zero_neg, tc) 466 { 467 #ifndef __HAVE_LONG_DOUBLE 468 atf_tc_skip("Requires long double support"); 469 #else 470 const long double x = -0.0L; 471 long double y; 472 size_t i; 473 474 ATF_REQUIRE(signbit(x) != 0); 475 476 for (i = 0; i < __arraycount(exps); i++) { 477 y = scalbnl(x, exps[i]); 478 ATF_CHECK(x == y); 479 ATF_CHECK(signbit(y) != 0); 480 } 481 #endif 482 } 483 484 ATF_TC(scalbnl_zero_pos); 485 ATF_TC_HEAD(scalbnl_zero_pos, tc) 486 { 487 atf_tc_set_md_var(tc, "descr", "Test scalbnl(+0.0, n) == +0.0"); 488 } 489 490 ATF_TC_BODY(scalbnl_zero_pos, tc) 491 { 492 #ifndef __HAVE_LONG_DOUBLE 493 atf_tc_skip("Requires long double support"); 494 #else 495 const long double x = 0.0L; 496 long double y; 497 size_t i; 498 499 ATF_REQUIRE(signbit(x) == 0); 500 501 for (i = 0; i < __arraycount(exps); i++) { 502 y = scalbnl(x, exps[i]); 503 ATF_CHECK(x == y); 504 ATF_CHECK(signbit(y) == 0); 505 } 506 #endif 507 } 508 509 ATF_TP_ADD_TCS(tp) 510 { 511 512 ATF_TP_ADD_TC(tp, scalbn_val); 513 ATF_TP_ADD_TC(tp, scalbn_nan); 514 ATF_TP_ADD_TC(tp, scalbn_inf_neg); 515 ATF_TP_ADD_TC(tp, scalbn_inf_pos); 516 ATF_TP_ADD_TC(tp, scalbn_ldexp); 517 ATF_TP_ADD_TC(tp, scalbn_zero_neg); 518 ATF_TP_ADD_TC(tp, scalbn_zero_pos); 519 520 ATF_TP_ADD_TC(tp, scalbnf_val); 521 ATF_TP_ADD_TC(tp, scalbnf_nan); 522 ATF_TP_ADD_TC(tp, scalbnf_inf_neg); 523 ATF_TP_ADD_TC(tp, scalbnf_inf_pos); 524 ATF_TP_ADD_TC(tp, scalbnf_ldexpf); 525 ATF_TP_ADD_TC(tp, scalbnf_zero_neg); 526 ATF_TP_ADD_TC(tp, scalbnf_zero_pos); 527 528 ATF_TP_ADD_TC(tp, scalbnl_val); 529 ATF_TP_ADD_TC(tp, scalbnl_nan); 530 ATF_TP_ADD_TC(tp, scalbnl_inf_neg); 531 ATF_TP_ADD_TC(tp, scalbnl_inf_pos); 532 /* ATF_TP_ADD_TC(tp, scalbnl_ldexp); */ 533 ATF_TP_ADD_TC(tp, scalbnl_zero_neg); 534 ATF_TP_ADD_TC(tp, scalbnl_zero_pos); 535 536 return atf_no_error(); 537 } 538
Indexes created Tue Sep 30 20:09:53 GMT 2025