Mercurial > hg > octave-shane > gnulib-hg
annotate tests/test-exp.h @ 17593:d1e383af69e2
manywarnings: remove -Wmudflap
* m4/manywarnings.m4 (gl_MANYWARN_ALL_GCC): Remove -Wmudflap, since
it is no longer supported in gcc-4.9-to-be.
| author | Jim Meyering <meyering@fb.com> |
|---|---|
| date | Thu, 02 Jan 2014 16:55:04 -0800 |
| parents | 344018b6e5d7 |
| children |
| rev | line source |
|---|---|
| 16577 | 1 /* Test of exp*() function family. |
| 17587 | 2 Copyright (C) 2012-2014 Free Software Foundation, Inc. |
| 16577 | 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 | |
| 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 16 | |
| 17 static void | |
| 18 test_function (void) | |
| 19 { | |
| 20 int i; | |
| 21 int j; | |
| 22 const DOUBLE TWO_MANT_DIG = | |
| 23 /* Assume MANT_DIG <= 5 * 31. | |
| 24 Use the identity | |
| 25 n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5). */ | |
| 26 (DOUBLE) (1U << ((MANT_DIG - 1) / 5)) | |
| 27 * (DOUBLE) (1U << ((MANT_DIG - 1 + 1) / 5)) | |
| 28 * (DOUBLE) (1U << ((MANT_DIG - 1 + 2) / 5)) | |
| 29 * (DOUBLE) (1U << ((MANT_DIG - 1 + 3) / 5)) | |
| 30 * (DOUBLE) (1U << ((MANT_DIG - 1 + 4) / 5)); | |
| 31 | |
| 32 /* Randomized tests. */ | |
| 33 { | |
| 34 /* Error bound, in ulps. */ | |
| 35 const DOUBLE err_bound = | |
|
16653
4d95f1c07c62
math tests: Small simplification.
Bruno Haible <bruno@clisp.org>
parents:
16577
diff
changeset
|
36 (sizeof (DOUBLE) > sizeof (double) ? |
| 16577 | 37 #if defined __i386__ && defined __FreeBSD__ |
| 38 /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of | |
| 39 precision in the compiler but 64 bits of precision at runtime. See | |
| 40 <http://lists.gnu.org/archive/html/bug-gnulib/2008-07/msg00063.html>. | |
| 41 The compiler has truncated all 'long double' literals in expl.c to | |
| 42 53 bits of precision. */ | |
| 43 L_(1350.0) | |
| 44 #else | |
| 45 L_(4.0) | |
| 46 #endif | |
| 47 : L_(2.0)); | |
| 48 | |
| 49 for (i = 0; i < SIZEOF (RANDOM); i++) | |
| 50 { | |
| 51 DOUBLE x = L_(16.0) * RANDOM[i]; /* 0.0 <= x <= 16.0 */ | |
| 52 DOUBLE y = EXP (x); | |
| 53 DOUBLE z = EXP (- x); | |
| 54 DOUBLE err = y * z - L_(1.0); | |
| 55 ASSERT (y > L_(0.0)); | |
| 56 ASSERT (z > L_(0.0)); | |
| 57 ASSERT (err > - err_bound / TWO_MANT_DIG | |
| 58 && err < err_bound / TWO_MANT_DIG); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 { | |
| 63 /* Error bound, in ulps. */ | |
| 64 const DOUBLE err_bound = | |
|
16653
4d95f1c07c62
math tests: Small simplification.
Bruno Haible <bruno@clisp.org>
parents:
16577
diff
changeset
|
65 (sizeof (DOUBLE) > sizeof (double) ? |
| 16577 | 66 #if defined __i386__ && defined __FreeBSD__ |
| 67 L_(2400.0) | |
| 68 #else | |
| 69 L_(24.0) | |
| 70 #endif | |
| 71 : L_(24.0)); | |
| 72 | |
| 73 for (i = 0; i < SIZEOF (RANDOM) / 5; i++) | |
| 74 for (j = 0; j < SIZEOF (RANDOM) / 5; j++) | |
| 75 { | |
| 76 DOUBLE x = L_(32.0) * RANDOM[i] - L_(16.0); /* -16.0 <= x <= 16.0 */ | |
| 77 DOUBLE y = L_(32.0) * RANDOM[j] - L_(16.0); /* -16.0 <= y <= 16.0 */ | |
| 78 DOUBLE z = - x - y; | |
| 79 /* Approximately x + y + z = 0. */ | |
| 80 DOUBLE err = EXP (x) * EXP (y) * EXP (z) - L_(1.0); | |
| 81 ASSERT (err > - err_bound / TWO_MANT_DIG | |
| 82 && err < err_bound / TWO_MANT_DIG); | |
| 83 } | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 volatile DOUBLE x; | |
| 88 DOUBLE y; |