ports/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, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <stdlib.h>
  22 #include <soft-fp.h>
  23 #include <quad.h>
  24
  25 long double
  26 __ieee754_sqrtl (const long double a)
  27 {
  28   FP_DECL_EX;
  29   FP_DECL_Q(A); FP_DECL_Q(C);
  30   long double c;
  31   long _round = 4;      /* dynamic rounding */
  32
  33   FP_INIT_ROUNDMODE;
  34   FP_UNPACK_Q(A, a);
  35   FP_SQRT_Q(C, A);
  36   FP_PACK_Q(c, C);
  37   FP_HANDLE_EXCEPTIONS;
  38   return c;
  39 }