libdecnumber/bid/host-ieee128.c

   1 /* This is a software decimal floating point library.
   2    Copyright (C) 2007-2016 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 }