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111
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1 /* Duff's device is legal C; test to make sure the compiler
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2 doesn't complain about it.
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3
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4 Roger Sayle <roger@eyesopen.com>
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5 Derived from duff-2.c. */
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6
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7 /* { dg-do run } */
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8 /* { dg-options "-O2" } */
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9
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10 extern void abort (void);
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11 extern void exit (int);
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12
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13 #if __INT_MAX__ >= 2147483647
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14 /* At least 32-bit integers. */
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15 typedef int type32;
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16 #else
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17 typedef long type32;
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18 #endif
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19
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20 type32
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21 cksum (const unsigned char *src, unsigned long size)
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22 {
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23 type32 ck = 0;
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24
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25 switch (size & 3)
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26 {
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27 do
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28 {
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29 case 0:
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30 ck ^= (type32)*src++ << 24;
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31 --size;
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32 case 3:
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33 ck ^= (type32)*src++ << 16;
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34 --size;
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35 case 2:
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36 ck ^= (type32)*src++ << 8;
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37 --size;
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38 case 1:
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39 ck ^= (type32)*src++;
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40 --size;
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41 }
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42 while (size > 0);
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43 }
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44
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45 return ck;
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46 }
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47
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48 const char testpat[] = "The quick brown fox jumped over the lazy dog.";
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49
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50 int
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51 main()
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52 {
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53 type32 ck;
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54
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55 ck = cksum ((const unsigned char *) testpat, sizeof (testpat));
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56 if (ck != 925902908)
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57 abort ();
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58
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59 exit (0);
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60 }
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