soft-fp/subtf3.c

   1 /* Software floating-point emulation.
   2    Return a - b
   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 Library General Public License as
  10    published by the Free Software Foundation; either version 2 of the
  11    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    Library General Public License for more details.
  17
  18    You should have received a copy of the GNU Library General Public
  19    License along with the GNU C Library; see the file COPYING.LIB.  If
  20    not, write to the Free Software Foundation, Inc.,
  21    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23 #include "soft-fp.h"
  24 #include "quad.h"
  25
  26 long double __subtf3(long double a, long double b)
  27 {
  28   FP_DECL_EX;
  29   FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(R);
  30   long double r;
  31
  32   FP_INIT_ROUNDMODE;
  33   FP_UNPACK_Q(A, a);
  34   FP_UNPACK_Q(B, b);
  35   FP_SUB_Q(R, A, B);
  36   FP_PACK_Q(r, R);
  37   FP_HANDLE_EXCEPTIONS;
  38
  39   return r;
  40 }