1/*  Copyright (C) 2007 IBM
2
3    Author: Pete Eberlein  eberlein@us.ibm.com
4
5    This program is free software; you can redistribute it and/or
6    modify it under the terms of the GNU General Public License as
7    published by the Free Software Foundation; either version 2 of the
8    License, or (at your option) any later version.
9
10    This program is distributed in the hope that it will be useful, but
11    WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    General Public License for more details.
14
15    You should have received a copy of the GNU General Public License
16    along with this program; if not, write to the Free Software
17    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18    02111-1307, USA.
19
20    The GNU General Public License is contained in the file COPYING.
21*/
22
23
24
25#include <stdio.h>
26#include <stdlib.h>
27#include <strings.h>
28
29#define CMPB(result,a,b) \
30    asm __volatile ("cmpb %0, %1, %2\n" : "=r"(result) : "r"(a), "r"(b))
31
32
33int main(int argc, char *argv[])
34{
35   int i, j, k;
36   long mask;
37   for (i = 1; i < 16; i++) {
38      mask = 0;
39      if (i & 1)
40         mask += 0xff;
41      if (i & 2)
42         mask += 0xff00;
43      if (i & 4)
44         mask += 0xff0000;
45      if (i & 8)
46         mask += 0xff000000;
47
48      for (j = 0; j < 256; j++)
49         for (k = 0; k < 256; k++)
50            if (j != k) {
51
52               long a, b, result;
53               a = (mask & (j * 0x1010101)) + ((~mask) & (k * 0x1010101));
54               b = j * 0x1010101;
55               CMPB(result, a, b);
56               if (result != mask) {
57                  printf("%llx %llx %llx %llx\n",
58                         (unsigned long long) mask, (unsigned long long) a,
59                         (unsigned long long) b,
60                         (unsigned long long) result);
61                  exit(1);
62		}
63            }
64
65   }
66
67   return 0;
68}
69