mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 04:01:10 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* Copyright (C) 2011-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv.h>
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <math-svid-compat.h>
|
|
#include <libm-alias-float.h>
|
|
|
|
|
|
#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27)
|
|
/* wrapper log2f(x) */
|
|
float
|
|
__log2f_compat (float x)
|
|
{
|
|
if (__builtin_expect (islessequal (x, 0.0f), 0) && _LIB_VERSION != _IEEE_)
|
|
{
|
|
if (x == 0.0)
|
|
{
|
|
feraiseexcept (FE_DIVBYZERO);
|
|
return __kernel_standard_f (x, x, 148); /* log2(0) */
|
|
}
|
|
else
|
|
{
|
|
feraiseexcept (FE_INVALID);
|
|
return __kernel_standard_f (x, x, 149); /* log2(x<0) */
|
|
}
|
|
}
|
|
|
|
return __ieee754_log2f (x);
|
|
}
|
|
compat_symbol (libm, __log2f_compat, log2f, GLIBC_2_1);
|
|
#endif
|