mirror of
https://github.com/ioacademy-jikim/debugging
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69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* Copyright (C) 2007 IBM
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Author: Pete Eberlein eberlein@us.ibm.com
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#define CMPB(result,a,b) \
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asm __volatile ("cmpb %0, %1, %2\n" : "=r"(result) : "r"(a), "r"(b))
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int main(int argc, char *argv[])
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{
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int i, j, k;
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long mask;
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for (i = 1; i < 16; i++) {
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mask = 0;
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if (i & 1)
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mask += 0xff;
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if (i & 2)
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mask += 0xff00;
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if (i & 4)
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mask += 0xff0000;
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if (i & 8)
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mask += 0xff000000;
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for (j = 0; j < 256; j++)
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for (k = 0; k < 256; k++)
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if (j != k) {
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long a, b, result;
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a = (mask & (j * 0x1010101)) + ((~mask) & (k * 0x1010101));
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b = j * 0x1010101;
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CMPB(result, a, b);
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if (result != mask) {
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printf("%llx %llx %llx %llx\n",
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(unsigned long long) mask, (unsigned long long) a,
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(unsigned long long) b,
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(unsigned long long) result);
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exit(1);
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}
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}
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}
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return 0;
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}
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