1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #include <math.h>
20 #include "math_private.h"
21
22
23 /* wrapper sqrtf */
24 float
sqrtf(float x)25 sqrtf (float x)
26 {
27 #if defined(__UCLIBC_HAS_FENV__)
28 if (__builtin_expect (isless (x, 0.0f), 0) && _LIB_VERSION != _IEEE_)
29 return __kernel_standard_f (x, x, 126); /* sqrt(negative) */
30 #endif
31 return (float) __ieee754_sqrt ((double) x);
32 }
33