Mercurial > gnulib
annotate tests/test-log10.h @ 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 |
|---|---|
| 16733 | 1 /* Test of log10*() function family. |
|
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maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
parents:
19484
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changeset
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2 Copyright (C) 2012-2019 Free Software Foundation, Inc. |
| 16733 | 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/>. */ |
| 16733 | 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 /* Pole. */ | |
| 33 { | |
| 34 DOUBLE z = LOG10 (L_(0.0)); | |
| 35 ASSERT (z == - HUGEVAL); | |
| 36 } | |
| 37 { | |
| 38 DOUBLE z = LOG10 (MINUS_ZERO); | |
| 39 ASSERT (z == - HUGEVAL); | |
| 40 } | |
| 41 | |
| 42 /* Randomized tests. */ | |
| 43 { | |
| 44 /* Error bound, in ulps. */ | |
| 45 const DOUBLE err_bound = | |
| 46 (sizeof (DOUBLE) > sizeof (double) ? | |
| 47 #if defined __i386__ && defined __FreeBSD__ | |
| 48 /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of | |
| 49 precision in the compiler but 64 bits of precision at runtime. See | |
|
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maint: shorten https://lists.gnu.org/archive/html/... links
Jim Meyering <meyering@fb.com>
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changeset
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50 <https://lists.gnu.org/r/bug-gnulib/2008-07/msg00063.html>. |
| 16733 | 51 The compiler has truncated all 'long double' literals in log10l.c to |
| 52 53 bits of precision. */ | |
| 53 L_(18.0) | |
| 54 #else | |
| 55 L_(3.0) | |
| 56 #endif | |
| 57 : L_(3.0)); | |
| 58 | |
| 59 for (i = 0; i < SIZEOF (RANDOM); i++) | |
| 60 { | |
| 61 DOUBLE x = L_(16.0) * RANDOM[i] + L_(1.0); /* 1.0 <= x <= 17.0 */ | |
| 62 DOUBLE y = LOG10 (x); | |
| 63 DOUBLE z = LOG10 (L_(1.0) / x); | |
| 64 DOUBLE err = y + z; | |
| 65 ASSERT (y >= L_(0.0)); | |
| 66 ASSERT (z <= L_(0.0)); | |
| 67 ASSERT (err > - err_bound / TWO_MANT_DIG | |
| 68 && err < err_bound / TWO_MANT_DIG); | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 { | |
| 73 /* Error bound, in ulps. */ | |
| 74 const DOUBLE err_bound = | |
| 75 (sizeof (DOUBLE) > sizeof (double) ? | |
| 76 #if defined __i386__ && defined __FreeBSD__ | |
| 77 /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of | |
| 78 precision in the compiler but 64 bits of precision at runtime. See | |
|
19439
8bfc20b57265
maint: shorten https://lists.gnu.org/archive/html/... links
Jim Meyering <meyering@fb.com>
parents:
19192
diff
changeset
|
79 <https://lists.gnu.org/r/bug-gnulib/2008-07/msg00063.html>. |
| 16733 | 80 The compiler has truncated all 'long double' literals in log10l.c to |
| 81 53 bits of precision. */ | |
| 82 L_(38.0) | |
| 83 #else | |
| 84 L_(5.0) | |
| 85 #endif | |
| 86 : L_(5.0)); | |
| 87 | |
| 16750 | 88 for (i = 0; i < SIZEOF (RANDOM) / 5; i++) |
| 89 for (j = 0; j < SIZEOF (RANDOM) / 5; j++) | |
| 16733 | 90 { |
| 91 DOUBLE x = L_(17.0) / (L_(16.0) - L_(15.0) * RANDOM[i]) - L_(1.0); | |
| 92 DOUBLE y = L_(17.0) / (L_(16.0) - L_(15.0) * RANDOM[j]) - L_(1.0); | |
| 93 /* 1/16 <= x,y <= 16 */ | |
| 94 DOUBLE z = L_(1.0) / (x * y); | |
| 95 /* Approximately x * y * z = 1. */ | |
| 96 DOUBLE err = LOG10 (x) + LOG10 (y) + LOG10 (z); | |
| 97 ASSERT (err > - err_bound / TWO_MANT_DIG | |
| 98 && err < err_bound / TWO_MANT_DIG); | |
| 99 } | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 volatile DOUBLE x; | |
| 104 DOUBLE y; |