1/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library 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 GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#define NO_MATH_REDIRECT
19#define dsqrtl __hide_dsqrtl
20#define f32xsqrtf64 __hide_f32xsqrtf64
21#include <math.h>
22#undef dsqrtl
23#undef f32xsqrtf64
24#include <math_private.h>
25#include <math-svid-compat.h>
26#include <math-narrow-alias.h>
27#include <libm-alias-double.h>
28
29
30#if LIBM_SVID_COMPAT
31/* wrapper sqrt */
32double
33__sqrt (double x)
34{
35 if (__builtin_expect (isless (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
36 return __kernel_standard (x, x, 26); /* sqrt(negative) */
37
38 return __ieee754_sqrt (x);
39}
40libm_alias_double (__sqrt, sqrt)
41libm_alias_double_narrow (__sqrt, sqrt)
42#endif
43

source code of glibc/math/w_sqrt_compat.c