math/w_sqrtf_compat.c

   1 /* Copyright (C) 2011-2017 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 #include <math-svid-compat.h>
  22 #include <libm-alias-float.h>
  23
  24
  25 #if LIBM_SVID_COMPAT
  26 /* wrapper sqrtf */
  27 float
  28 __sqrtf (float x)
  29 {
  30   if (__builtin_expect (isless (x, 0.0f), 0) && _LIB_VERSION != _IEEE_)
  31     return __kernel_standard_f (x, x, 126); /* sqrt(negative) */
  32
  33   return __ieee754_sqrtf (x);
  34 }
  35 libm_alias_float (__sqrt, sqrt)
  36 #endif