sysdeps/powerpc/fpu/w_sqrt.c

   1 /* Double-precision floating point square root wrapper.
   2    Copyright (C) 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22 #include <fenv_libc.h>
  23
  24 #ifdef __STDC__
  25 double
  26 __sqrt (double x)               /* wrapper sqrt */
  27 #else
  28 double
  29 __sqrt (x)                      /* wrapper sqrt */
  30      double x;
  31 #endif
  32 {
  33 #ifdef _IEEE_LIBM
  34   return __ieee754_sqrt (x);
  35 #else
  36   double z;
  37   z = __ieee754_sqrt (x);
  38   if (_LIB_VERSION == _IEEE_ || (x != x))
  39     return z;
  40
  41   if (x < 0.0)
  42     return __kernel_standard (x, x, 26);        /* sqrt(negative) */
  43   else
  44     return z;
  45 #endif
  46 }
  47
  48 weak_alias (__sqrt, sqrt)
  49 #ifdef NO_LONG_DOUBLE
  50   strong_alias (__sqrt, __sqrtl) weak_alias (__sqrt, sqrtl)
  51 #endif