sysdeps/alpha/soft-fp/e_sqrtl.c

   1 /* long double square root in software floating-point emulation.
   2    Copyright (C) 1997, 1999, 2006 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Richard Henderson (rth@cygnus.com) and
   5                   Jakub Jelinek (jj@ultra.linux.cz).
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <stdlib.h>
  23 #include <soft-fp.h>
  24 #include <quad.h>
  25
  26 long double
  27 __ieee754_sqrtl (const long double a)
  28 {
  29   FP_DECL_EX;
  30   FP_DECL_Q(A); FP_DECL_Q(C);
  31   long double c;
  32   long _round = 4;      /* dynamic rounding */
  33
  34   FP_INIT_ROUNDMODE;
  35   FP_UNPACK_Q(A, a);
  36   FP_SQRT_Q(C, A);
  37   FP_PACK_Q(c, C);
  38   FP_HANDLE_EXCEPTIONS;
  39   return c;
  40 }