1  /* This is a software decimal floating point library.
       2     Copyright (C) 2007-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of GCC.
       5  
       6  GCC is free software; you can redistribute it and/or modify it under
       7  the terms of the GNU General Public License as published by the Free
       8  Software Foundation; either version 3, or (at your option) any later
       9  version.
      10  
      11  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      12  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      14  for more details.
      15  
      16  Under Section 7 of GPL version 3, you are granted additional
      17  permissions described in the GCC Runtime Library Exception, version
      18  3.1, as published by the Free Software Foundation.
      19  
      20  You should have received a copy of the GNU General Public License and
      21  a copy of the GCC Runtime Library Exception along with this program;
      22  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23  <http://www.gnu.org/licenses/>.  */
      24  
      25  #include <string.h>
      26  
      27  #include "dconfig.h"
      28  #include "bid-dpd.h"
      29  #include "decimal128.h"
      30  
      31  void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
      32  void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
      33  
      34  /* The code for converting 128-bit values between DPD and BID presumes
      35     that the 64-bit halves of the 128-bit value are in little-endian
      36     order, so they need swapping on big-endian hosts.  */
      37  
      38  void
      39  __host_to_ieee_128 (_Decimal128 in, decimal128 *out)
      40  {
      41  #if WORDS_BIGENDIAN
      42    memcpy ((char *) out, (char *) &in + 8, 8);
      43    memcpy ((char *) out + 8, (char *) &in, 8);
      44  #else
      45    memcpy ((char *) out, (char *) &in, 16);
      46  #endif
      47  }
      48  
      49  void
      50  __ieee_to_host_128 (decimal128 in, _Decimal128 *out)
      51  {
      52  #if WORDS_BIGENDIAN
      53    memcpy ((char *) out, (char *) &in + 8, 8);
      54    memcpy ((char *) out + 8, (char *) &in, 8);
      55  #else
      56    memcpy ((char *) out, (char *) &in, 16);
      57  #endif
      58  }