Mercurial > gnulib
annotate tests/test-float.c @ 40231:9b3c79fdfe0b
strtod: fix clash with strtold
Problem reported for RHEL 5 by Jesse Caldwell (Bug#34817).
* lib/strtod.c (compute_minus_zero, minus_zero):
Simplify by remving the macro / external variable,
and having just a function. User changed. This avoids
the need for an external variable that might clash.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Mon, 11 Mar 2019 16:40:29 -0700 |
| parents | b06060465f09 |
| children |
| rev | line source |
|---|---|
| 15300 | 1 /* Test of <float.h> substitute. |
|
40057
b06060465f09
maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
parents:
19484
diff
changeset
|
2 Copyright (C) 2011-2019 Free Software Foundation, Inc. |
| 15300 | 3 |
| 4 This program is free software: you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 3 of the License, or | |
| 7 (at your option) any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 19190 | 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 15300 | 16 |
| 17 /* Written by Bruno Haible <bruno@clisp.org>, 2011. */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 #include <float.h> | |
| 22 | |
| 23 #include "fpucw.h" | |
| 24 #include "macros.h" | |
| 25 | |
| 26 /* Check that FLT_RADIX is a constant expression. */ | |
| 27 int a[] = { FLT_RADIX }; | |
| 28 | |
| 29 #if FLT_RADIX == 2 | |
| 30 | |
| 31 /* Return 2^n. */ | |
| 32 static float | |
| 33 pow2f (int n) | |
| 34 { | |
| 35 int k = n; | |
| 36 volatile float x = 1; | |
| 37 volatile float y = 2; | |
| 38 /* Invariant: 2^n == x * y^k. */ | |
| 39 if (k < 0) | |
| 40 { | |
| 41 y = 0.5f; | |
| 42 k = - k; | |
| 43 } | |
| 44 while (k > 0) | |
| 45 { | |
| 46 if (k != 2 * (k / 2)) | |
| 47 { | |
| 48 x = x * y; | |
| 49 k = k - 1; | |
| 50 } | |
| 51 if (k == 0) | |
| 52 break; | |
| 53 y = y * y; | |
| 54 k = k / 2; | |
| 55 } | |
| 56 /* Now k == 0, hence x == 2^n. */ | |
| 57 return x; | |
| 58 } | |
| 59 | |
| 60 /* Return 2^n. */ | |
| 61 static double | |
| 62 pow2d (int n) | |
| 63 { | |
| 64 int k = n; | |
| 65 volatile double x = 1; | |
| 66 volatile double y = 2; | |
| 67 /* Invariant: 2^n == x * y^k. */ | |
| 68 if (k < 0) | |
| 69 { | |
| 70 y = 0.5; | |
| 71 k = - k; | |
| 72 } | |
| 73 while (k > 0) | |
| 74 { | |
| 75 if (k != 2 * (k / 2)) | |
| 76 { | |
| 77 x = x * y; | |
| 78 k = k - 1; | |
| 79 } | |
| 80 if (k == 0) | |
| 81 break; | |
| 82 y = y * y; | |
| 83 k = k / 2; | |
| 84 } | |
| 85 /* Now k == 0, hence x == 2^n. */ | |
| 86 return x; | |
| 87 } | |
| 88 | |
| 89 /* Return 2^n. */ | |
| 90 static long double | |
| 91 pow2l (int n) | |
| 92 { | |
| 93 int k = n; | |
| 94 volatile long double x = 1; | |
| 95 volatile long double y = 2; | |
| 96 /* Invariant: 2^n == x * y^k. */ | |
| 97 if (k < 0) | |
| 98 { | |
| 99 y = 0.5L; | |
| 100 k = - k; | |
| 101 } | |
| 102 while (k > 0) | |
| 103 { | |
| 104 if (k != 2 * (k / 2)) | |
| 105 { | |
| 106 x = x * y; | |
| 107 k = k - 1; | |
| 108 } | |
| 109 if (k == 0) | |
| 110 break; | |
| 111 y = y * y; | |
| 112 k = k / 2; | |
| 113 } | |
| 114 /* Now k == 0, hence x == 2^n. */ | |
| 115 return x; | |
| 116 } | |
| 117 | |
| 118 /* ----------------------- Check macros for 'float' ----------------------- */ | |
| 119 | |
| 120 /* Check that the FLT_* macros expand to constant expressions. */ | |
| 121 int fb[] = | |
| 122 { | |
| 123 FLT_MANT_DIG, FLT_MIN_EXP, FLT_MAX_EXP, | |
| 124 FLT_DIG, FLT_MIN_10_EXP, FLT_MAX_10_EXP | |
| 125 }; | |
| 126 float fc[] = { FLT_EPSILON, FLT_MIN, FLT_MAX }; | |
| 127 | |
| 128 static void | |
| 129 test_float (void) | |
| 130 { | |
| 131 /* Check that the value of FLT_MIN_EXP is well parenthesized. */ | |
| 132 ASSERT ((FLT_MIN_EXP % 101111) == (FLT_MIN_EXP) % 101111); | |
| 133 | |
| 134 /* Check that the value of DBL_MIN_10_EXP is well parenthesized. */ | |
| 135 ASSERT ((FLT_MIN_10_EXP % 101111) == (FLT_MIN_10_EXP) % 101111); | |
| 136 | |
| 137 /* Check that 'float' is as specified in IEEE 754. */ | |
| 138 ASSERT (FLT_MANT_DIG == 24); | |
| 139 ASSERT (FLT_MIN_EXP == -125); | |
| 140 ASSERT (FLT_MAX_EXP == 128); | |
| 141 | |
| 142 /* Check the value of FLT_MIN_10_EXP. */ | |
| 143 ASSERT (FLT_MIN_10_EXP == - (int) (- (FLT_MIN_EXP - 1) * 0.30103)); | |
| 144 | |
| 145 /* Check the value of FLT_DIG. */ | |
| 146 ASSERT (FLT_DIG == (int) ((FLT_MANT_DIG - 1) * 0.30103)); | |
| 147 | |
| 148 /* Check the value of FLT_MIN_10_EXP. */ | |
| 149 ASSERT (FLT_MIN_10_EXP == - (int) (- (FLT_MIN_EXP - 1) * 0.30103)); | |
| 150 | |
| 151 /* Check the value of FLT_MAX_10_EXP. */ | |
| 152 ASSERT (FLT_MAX_10_EXP == (int) (FLT_MAX_EXP * 0.30103)); | |
| 153 | |
| 154 /* Check the value of FLT_MAX. */ | |
| 155 { | |
| 156 volatile float m = FLT_MAX; | |
| 157 int n; | |
| 158 | |
| 159 ASSERT (m + m > m); | |
| 160 for (n = 0; n <= 2 * FLT_MANT_DIG; n++) | |
| 161 { | |
| 162 volatile float pow2_n = pow2f (n); /* 2^n */ | |
| 163 volatile float x = m + (m / pow2_n); | |
| 164 if (x > m) | |
| 165 ASSERT (x + x == x); | |
| 166 else | |
| 167 ASSERT (!(x + x == x)); | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 /* Check the value of FLT_MIN. */ | |
| 172 { | |
| 173 volatile float m = FLT_MIN; | |
| 174 volatile float x = pow2f (FLT_MIN_EXP - 1); | |
| 175 ASSERT (m == x); | |
| 176 } | |
| 177 | |
| 178 /* Check the value of FLT_EPSILON. */ | |
| 179 { | |
| 180 volatile float e = FLT_EPSILON; | |
| 181 volatile float me; | |
| 182 int n; | |
| 183 | |
| 184 me = 1.0f + e; | |
| 185 ASSERT (me > 1.0f); | |
| 186 ASSERT (me - 1.0f == e); | |
| 187 for (n = 0; n <= 2 * FLT_MANT_DIG; n++) | |
| 188 { | |
| 189 volatile float half_n = pow2f (- n); /* 2^-n */ | |
| 190 volatile float x = me - half_n; | |
| 191 if (x < me) | |
| 192 ASSERT (x <= 1.0f); | |
| 193 } | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 /* ----------------------- Check macros for 'double' ----------------------- */ | |
| 198 | |
| 199 /* Check that the DBL_* macros expand to constant expressions. */ | |
| 200 int db[] = | |
| 201 { | |
| 202 DBL_MANT_DIG, DBL_MIN_EXP, DBL_MAX_EXP, | |
| 203 DBL_DIG, DBL_MIN_10_EXP, DBL_MAX_10_EXP | |
| 204 }; | |
| 205 double dc[] = { DBL_EPSILON, DBL_MIN, DBL_MAX }; | |
| 206 | |
| 207 static void | |
| 208 test_double (void) | |
| 209 { | |
| 210 /* Check that the value of DBL_MIN_EXP is well parenthesized. */ | |
| 211 ASSERT ((DBL_MIN_EXP % 101111) == (DBL_MIN_EXP) % 101111); | |
| 212 | |
| 213 /* Check that the value of DBL_MIN_10_EXP is well parenthesized. */ | |
| 214 ASSERT ((DBL_MIN_10_EXP % 101111) == (DBL_MIN_10_EXP) % 101111); | |
| 215 | |
| 216 /* Check that 'double' is as specified in IEEE 754. */ | |
| 217 ASSERT (DBL_MANT_DIG == 53); | |
| 218 ASSERT (DBL_MIN_EXP == -1021); | |
| 219 ASSERT (DBL_MAX_EXP == 1024); | |
| 220 | |
| 221 /* Check the value of DBL_MIN_10_EXP. */ | |
| 222 ASSERT (DBL_MIN_10_EXP == - (int) (- (DBL_MIN_EXP - 1) * 0.30103)); | |
| 223 | |
| 224 /* Check the value of DBL_DIG. */ | |
| 225 ASSERT (DBL_DIG == (int) ((DBL_MANT_DIG - 1) * 0.30103)); | |
| 226 | |
| 227 /* Check the value of DBL_MIN_10_EXP. */ | |
| 228 ASSERT (DBL_MIN_10_EXP == - (int) (- (DBL_MIN_EXP - 1) * 0.30103)); | |
| 229 | |
| 230 /* Check the value of DBL_MAX_10_EXP. */ | |
| 231 ASSERT (DBL_MAX_10_EXP == (int) (DBL_MAX_EXP * 0.30103)); | |
| 232 | |
| 233 /* Check the value of DBL_MAX. */ | |
| 234 { | |
| 235 volatile double m = DBL_MAX; | |
| 236 int n; | |
| 237 | |
| 238 ASSERT (m + m > m); | |
| 239 for (n = 0; n <= 2 * DBL_MANT_DIG; n++) | |
| 240 { | |
| 241 volatile double pow2_n = pow2d (n); /* 2^n */ | |
| 242 volatile double x = m + (m / pow2_n); | |
| 243 if (x > m) | |
| 244 ASSERT (x + x == x); | |
| 245 else | |
| 246 ASSERT (!(x + x == x)); | |
| 247 } | |
| 248 } | |
| 249 | |
| 250 /* Check the value of DBL_MIN. */ | |
| 251 { | |
| 252 volatile double m = DBL_MIN; | |
| 253 volatile double x = pow2d (DBL_MIN_EXP - 1); | |
| 254 ASSERT (m == x); | |
| 255 } | |
| 256 | |
| 257 /* Check the value of DBL_EPSILON. */ | |
| 258 { | |
| 259 volatile double e = DBL_EPSILON; | |
| 260 volatile double me; | |
| 261 int n; | |
| 262 | |
| 263 me = 1.0 + e; | |
| 264 ASSERT (me > 1.0); | |
| 265 ASSERT (me - 1.0 == e); | |
| 266 for (n = 0; n <= 2 * DBL_MANT_DIG; n++) | |
| 267 { | |
| 268 volatile double half_n = pow2d (- n); /* 2^-n */ | |
| 269 volatile double x = me - half_n; | |
| 270 if (x < me) | |
| 271 ASSERT (x <= 1.0); | |
| 272 } | |
| 273 } | |
| 274 } | |
| 275 | |
| 276 /* -------------------- Check macros for 'long double' -------------------- */ | |
| 277 | |
| 278 /* Check that the LDBL_* macros expand to constant expressions. */ | |
| 279 int lb[] = | |
| 280 { | |
| 281 LDBL_MANT_DIG, LDBL_MIN_EXP, LDBL_MAX_EXP, | |
| 282 LDBL_DIG, LDBL_MIN_10_EXP, LDBL_MAX_10_EXP | |
| 283 }; | |
| 284 long double lc1 = LDBL_EPSILON; | |
| 285 long double lc2 = LDBL_MIN; | |
| 286 #if 0 /* LDBL_MAX is not a constant expression on some platforms. */ | |
| 287 long double lc3 = LDBL_MAX; | |
| 288 #endif | |
| 289 | |
| 290 static void | |
| 291 test_long_double (void) | |
| 292 { | |
| 293 /* Check that the value of LDBL_MIN_EXP is well parenthesized. */ | |
| 294 ASSERT ((LDBL_MIN_EXP % 101111) == (LDBL_MIN_EXP) % 101111); | |
| 295 | |
| 296 /* Check that the value of LDBL_MIN_10_EXP is well parenthesized. */ | |
| 297 ASSERT ((LDBL_MIN_10_EXP % 101111) == (LDBL_MIN_10_EXP) % 101111); | |
| 298 | |
| 299 /* Check that 'long double' is at least as wide as 'double'. */ | |
| 300 ASSERT (LDBL_MANT_DIG >= DBL_MANT_DIG); | |
|
16136
fd0796dd37e2
float tests: Correct and re-enable assertion about LDBL_MIN_EXP.
Paolo Bonzini <bonzini@gnu.org>
parents:
15545
diff
changeset
|
301 ASSERT (LDBL_MIN_EXP - LDBL_MANT_DIG <= DBL_MIN_EXP - DBL_MANT_DIG); |
| 15300 | 302 ASSERT (LDBL_MAX_EXP >= DBL_MAX_EXP); |
| 303 | |
| 304 /* Check the value of LDBL_DIG. */ | |
| 305 ASSERT (LDBL_DIG == (int)((LDBL_MANT_DIG - 1) * 0.30103)); | |
| 306 | |
| 307 /* Check the value of LDBL_MIN_10_EXP. */ | |
| 308 ASSERT (LDBL_MIN_10_EXP == - (int) (- (LDBL_MIN_EXP - 1) * 0.30103)); | |
| 309 | |
| 310 /* Check the value of LDBL_MAX_10_EXP. */ | |
| 311 ASSERT (LDBL_MAX_10_EXP == (int) (LDBL_MAX_EXP * 0.30103)); | |
| 312 | |
| 313 /* Check the value of LDBL_MAX. */ | |
| 314 { | |
| 315 volatile long double m = LDBL_MAX; | |
| 316 int n; | |
| 317 | |
| 318 ASSERT (m + m > m); | |
| 319 for (n = 0; n <= 2 * LDBL_MANT_DIG; n++) | |
| 320 { | |
| 321 volatile long double pow2_n = pow2l (n); /* 2^n */ | |
| 322 volatile long double x = m + (m / pow2_n); | |
| 323 if (x > m) | |
| 324 ASSERT (x + x == x); | |
| 325 else | |
| 326 ASSERT (!(x + x == x)); | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 /* Check the value of LDBL_MIN. */ | |
| 331 { | |
| 332 volatile long double m = LDBL_MIN; | |
| 333 volatile long double x = pow2l (LDBL_MIN_EXP - 1); | |
| 334 ASSERT (m == x); | |
| 335 } | |
| 336 | |
| 337 /* Check the value of LDBL_EPSILON. */ | |
| 338 { | |
| 339 volatile long double e = LDBL_EPSILON; | |
| 340 volatile long double me; | |
| 341 int n; | |
| 342 | |
| 343 me = 1.0L + e; | |
| 344 ASSERT (me > 1.0L); | |
| 345 ASSERT (me - 1.0L == e); | |
| 346 for (n = 0; n <= 2 * LDBL_MANT_DIG; n++) | |
| 347 { | |
| 348 volatile long double half_n = pow2l (- n); /* 2^-n */ | |
| 349 volatile long double x = me - half_n; | |
| 350 if (x < me) | |
| 351 ASSERT (x <= 1.0L); | |
| 352 } | |
| 353 } | |
| 354 } | |
| 355 | |
| 356 int | |
| 357 main () | |
| 358 { | |
| 359 test_float (); | |
| 360 test_double (); | |
| 361 | |
| 362 { | |
| 363 DECL_LONG_DOUBLE_ROUNDING | |
| 364 | |
| 365 BEGIN_LONG_DOUBLE_ROUNDING (); | |
| 366 | |
| 367 test_long_double (); | |
| 368 | |
| 369 END_LONG_DOUBLE_ROUNDING (); | |
| 370 } | |
| 371 | |
| 372 return 0; | |
| 373 } | |
| 374 | |
| 375 #else | |
| 376 | |
| 377 int | |
| 378 main () | |
| 379 { | |
| 15361 | 380 fprintf (stderr, "Skipping test: FLT_RADIX is not 2.\n"); |
| 15300 | 381 return 77; |
| 382 } | |
| 383 | |
| 384 #endif |