soft-fp/trunctfdf2.c

   1 /* Software floating-point emulation.
   2    Truncate IEEE quad into IEEE double
   3    Copyright (C) 1997,1999 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Richard Henderson (rth@cygnus.com) and
   6                   Jakub Jelinek (jj@ultra.linux.cz).
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, write to the Free
  20    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21    02111-1307 USA.  */
  22
  23 #include "soft-fp.h"
  24 #include "double.h"
  25 #include "quad.h"
  26
  27 double __trunctfdf2(long double a)
  28 {
  29   FP_DECL_EX;
  30   FP_DECL_Q(A);
  31   FP_DECL_D(R);
  32   double r;
  33
  34   FP_INIT_ROUNDMODE;
  35   FP_UNPACK_Q(A, a);
  36 #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
  37   FP_CONV(D,Q,2,4,R,A);
  38 #else
  39   FP_CONV(D,Q,1,2,R,A);
  40 #endif
  41   FP_PACK_D(r, R);
  42   FP_HANDLE_EXCEPTIONS;
  43
  44   return r;
  45 }