libgcc/config/frv/cmovh.c

   1 /* Move half-word library function.
   2    Copyright (C) 2000-2018 Free Software Foundation, Inc.
   3    Contributed by Red Hat, Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software ; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY ; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 void
  27 __cmovh (short *dest, const short *src, unsigned len)
  28 {
  29   unsigned i;
  30   unsigned num = len >> 1;
  31   char *dest_byte = (char *)dest;
  32   const char *src_byte = (const char *)src;
  33
  34   if (dest_byte < src_byte || dest_byte > src_byte+len)
  35     {
  36       for (i = 0; i < num; i++)
  37         dest[i] = src[i];
  38
  39       if ((len & 1) != 0)
  40         dest_byte[len-1] = src_byte[len-1];
  41     }
  42   else
  43     {
  44       while (len-- > 0)
  45         dest_byte[len] = src_byte[len];
  46     }
  47 }