ACStone/123.loop.c at master · ArchC/ACStone · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/**
 * @file      123.loop.c
 * @author    The ArchC Team
 *            http://www.archc.org/
 *
 *            Computer Systems Laboratory (LSC)
 *            IC-UNICAMP
 *            http://www.lsc.ic.unicamp.br
 *
 * @version   1.0
 * @date      Mon, 19 Jun 2006 15:33:21 -0300
 * @brief     It is a simple main function that uses a implemented unsigned multiplication
 *
 * @attention Copyright (C) 2002-2006 --- The ArchC Team
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

/* The file begin.h is included if compiler flag -DBEGINCODE is used */
#ifdef BEGINCODE
#include "begin.h"
#endif

int main() {

  unsigned char count;
  unsigned int C,A,Q,M;
  unsigned long long int result;

  count=32; /* 32 bits * 32 bits = 64 bits */

  /* Some variable */
  M=0x1314AB42;
  Q=0xF1B34517;
  A=0x00000000;
  C=0x00000000;

  while(count!=0) {

    /* if q0 = 1 add */
    if(Q & 0x00000001) {
      if(((unsigned long long int)A+
	  (unsigned long long int)M) > 0xFFFFFFFF) /* Check if have carry */
	C=1;
      else
	C=0;
      A=A+M;
    }

    /* Shift */
    Q=Q>>1;
    if(A & 0x00000001)
      Q=(Q | 0x80000000);
    A=A>>1;
    if(C & 0x00000001)
      A=(A | 0x80000000);
    C=C>>1;

    /* Decrement counter */
    count--;

  }

  result=0;
  result=((((unsigned long long int)(A)) << 32) |
	  ((unsigned long long int)(Q)));
  /* Before result must be 1298111822488546542 */ result=0;

  return 0;
  /* Return 0 only */
}

/* The file end.h is included if compiler flag -DENDCODE is used */
#ifdef ENDCODE
#include "end.h"
#endif