mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 09:43:32 +08:00
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Wrapper to implement llogb in terms of ilogb.
|
|
Copyright (C) 2012-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <math.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <math_private.h>
|
|
#include <fenv.h>
|
|
|
|
long int
|
|
M_DECL_FUNC (__llogb) (FLOAT x)
|
|
{
|
|
int r = M_SUF (__ieee754_ilogb) (x);
|
|
long int lr = r;
|
|
if (__glibc_unlikely (r == FP_ILOGB0)
|
|
|| __glibc_unlikely (r == FP_ILOGBNAN)
|
|
|| __glibc_unlikely (r == INT_MAX))
|
|
{
|
|
#if LONG_MAX != INT_MAX
|
|
if (r == FP_ILOGB0)
|
|
lr = FP_LLOGB0;
|
|
else if (r == FP_ILOGBNAN)
|
|
lr = FP_LLOGBNAN;
|
|
else
|
|
lr = LONG_MAX;
|
|
#endif
|
|
__set_errno (EDOM);
|
|
__feraiseexcept (FE_INVALID);
|
|
}
|
|
return lr;
|
|
}
|
|
declare_mgen_alias (__llogb, llogb)
|