gcc/config/frv/cmovh.c

   1 /* Move half-word library function.
   2    Copyright (C) 2000, 2003 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 2, 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    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING.  If not, write to
  19    the Free Software Foundation, 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 void
  30 __cmovh (short *dest, const short *src, unsigned len)
  31 {
  32   unsigned i;
  33   unsigned num = len >> 1;
  34   char *dest_byte = (char *)dest;
  35   const char *src_byte = (const char *)src;
  36
  37   if (dest_byte < src_byte || dest_byte > src_byte+len)
  38     {
  39       for (i = 0; i < num; i++)
  40         dest[i] = src[i];
  41
  42       if ((len & 1) != 0)
  43         dest_byte[len-1] = src_byte[len-1];
  44     }
  45   else
  46     {
  47       while (len-- > 0)
  48         dest_byte[len] = src_byte[len];
  49     }
  50 }