mirror of
https://git.savannah.gnu.org/git/gnulib.git
synced 2025-08-16 01:22:18 +03:00
a3fd683de3
* build-aux/gendocs.sh (version): * doc/gendocs_template: * doc/gendocs_template_min: * doc/gnulib.texi: * lib/version-etc.c (COPYRIGHT_YEAR): Update copyright dates by hand in templates and the like. * all files: Run 'make update-copyright'.
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
/* Test of cbrt*() function family.
|
|
Copyright (C) 2012-2017 Free Software Foundation, Inc.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
static void
|
|
test_function (void)
|
|
{
|
|
int i;
|
|
int j;
|
|
const DOUBLE TWO_MANT_DIG =
|
|
/* Assume MANT_DIG <= 5 * 31.
|
|
Use the identity
|
|
n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5). */
|
|
(DOUBLE) (1U << ((MANT_DIG - 1) / 5))
|
|
* (DOUBLE) (1U << ((MANT_DIG - 1 + 1) / 5))
|
|
* (DOUBLE) (1U << ((MANT_DIG - 1 + 2) / 5))
|
|
* (DOUBLE) (1U << ((MANT_DIG - 1 + 3) / 5))
|
|
* (DOUBLE) (1U << ((MANT_DIG - 1 + 4) / 5));
|
|
|
|
/* Randomized tests. */
|
|
for (i = 0; i < SIZEOF (RANDOM); i++)
|
|
{
|
|
DOUBLE x = L_(32.0) * RANDOM[i] - L_(16.0); /* -16.0 <= x <= 16.0 */
|
|
DOUBLE y = CBRT (x);
|
|
DOUBLE err = y * y * y - x;
|
|
ASSERT (err > - L_(4.0) * L_(16.0) / TWO_MANT_DIG
|
|
&& err < L_(4.0) * L_(16.0) / TWO_MANT_DIG);
|
|
}
|
|
|
|
for (i = 0; i < SIZEOF (RANDOM) / 5; i++)
|
|
for (j = 0; j < SIZEOF (RANDOM) / 5; j++)
|
|
{
|
|
DOUBLE x = L_(32.0) * RANDOM[i] - L_(16.0); /* -16.0 <= x <= 16.0 */
|
|
DOUBLE y = L_(32.0) * RANDOM[j] - L_(16.0); /* -16.0 <= y <= 16.0 */
|
|
if (x != L_(0.0) && y != L_(0.0))
|
|
{
|
|
DOUBLE z = L_(1.0) / (x * y);
|
|
/* Approximately x * y * z = 1. */
|
|
DOUBLE p = CBRT (x) * CBRT (y) * CBRT (z);
|
|
ASSERT (p > L_(1.0) - L_(8.0) / TWO_MANT_DIG
|
|
&& p < L_(1.0) + L_(8.0) / TWO_MANT_DIG);
|
|
}
|
|
}
|
|
}
|
|
|
|
volatile DOUBLE x;
|
|
DOUBLE y;
|