sysdeps/powerpc/soft-fp/q_neg.c

   1 /* Software floating-point emulation.
   2    Return !a
   3    Copyright (C) 1997, 1999, 2000 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 "quad.h"
  25
  26 long double _q_neg(const long double a)
  27 {
  28   FP_DECL_EX;
  29   long double c = a;
  30
  31 #if (__BYTE_ORDER == __BIG_ENDIAN)
  32   ((UWtype *)&c)[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
  33 #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
  34   ((UWtype *)&c)[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
  35 #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
  36   ((UWtype *)&c)[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
  37 #else
  38   FP_DECL_Q(A); FP_DECL_Q(C);
  39
  40   FP_UNPACK_Q(A, a);
  41   FP_NEG_Q(C, A);
  42   FP_PACK_Q(c, C);
  43 #endif
  44   FP_CLEAR_EXCEPTIONS;
  45   FP_HANDLE_EXCEPTIONS;
  46   return c;
  47 }