mirror of git://sourceware.org/git/glibc.git
30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
/* Return the reciprocal of the square root of X.
|
|
Copyright (C) 2025 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 <errno.h>
|
|
#include <math.h>
|
|
|
|
FLOAT
|
|
M_DECL_FUNC (__rsqrt) (FLOAT x)
|
|
{
|
|
if (islessequal (x, M_LIT (0.0)))
|
|
__set_errno (x < 0 ? EDOM : ERANGE);
|
|
return M_LIT (1.0) / M_SQRT (x);
|
|
}
|
|
declare_mgen_alias (__rsqrt, rsqrt);
|