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, see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #include "soft-fp.h"
  23 #include "quad.h"
  24
  25 long double _q_neg(const long double a)
  26 {
  27   FP_DECL_EX;
  28   long double c = a;
  29
  30 #if (__BYTE_ORDER == __BIG_ENDIAN)
  31   ((UWtype *)&c)[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
  32 #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
  33   ((UWtype *)&c)[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
  34 #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
  35   ((UWtype *)&c)[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
  36 #else
  37   FP_DECL_Q(A); FP_DECL_Q(C);
  38
  39   FP_UNPACK_Q(A, a);
  40   FP_NEG_Q(C, A);
  41   FP_PACK_Q(c, C);
  42 #endif
  43   FP_CLEAR_EXCEPTIONS;
  44   FP_HANDLE_EXCEPTIONS;
  45   return c;
  46 }