sysdeps/x86_64/fpu/e_sqrt.c

   1 /* Square root of floating point number.
   2    Copyright (C) 2002-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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_private.h>
  20
  21 #undef __ieee754_sqrt
  22 double
  23 __ieee754_sqrt (double x)
  24 {
  25   double res;
  26
  27   asm ("sqrtsd %1, %0" : "=x" (res) : "xm" (x));
  28
  29   return res;
  30 }
  31 strong_alias (__ieee754_sqrt, __sqrt_finite)