1  /* Software floating-point emulation.
       2     Return !a
       3     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include "soft-fp.h"
      21  #include "quad.h"
      22  
      23  long double _Q_neg(const long double a)
      24  {
      25    union {
      26      long double	ldbl;
      27      UWtype	words[4];
      28    } c;
      29  
      30    c.ldbl = a;
      31  
      32  #if (__BYTE_ORDER == __BIG_ENDIAN)
      33    c.words[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
      34  #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
      35    c.words[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
      36  #elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
      37    c.words[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
      38  #else
      39    FP_DECL_Q(A); FP_DECL_Q(C);
      40  
      41    FP_UNPACK_RAW_Q(A, a);
      42    FP_NEG_Q(C, A);
      43    FP_PACK_RAW_Q(c.ldbl, C);
      44  #endif
      45    return c.ldbl;
      46  }