1 /* Duff's device is legal C; test to make sure the compiler
2 doesn't complain about it.
4 Jason Thorpe <thorpej@wasabisystems.com>
5 Derived from Tom Duff's original usenet message about the device. */
8 /* { dg-options "-O2" } */
10 extern void abort (void);
11 extern void exit (int);
13 typedef __SIZE_TYPE__ size_t;
14 extern int memcmp (const void *, const void *, size_t);
17 duffcpy (char *dst, const char *src, unsigned long size)
19 unsigned long n = (size + 7) / 8;
23 case 0: do { *dst++ = *src++;
24 case 7: *dst++ = *src++;
25 case 6: *dst++ = *src++;
26 case 5: *dst++ = *src++;
27 case 4: *dst++ = *src++;
28 case 3: *dst++ = *src++;
29 case 2: *dst++ = *src++;
30 case 1: *dst++ = *src++;
35 const char testpat[] = "The quick brown fox jumped over the lazy dog.";
42 duffcpy (buf, testpat, sizeof (testpat));
43 if (memcmp (buf, testpat, sizeof (testpat)) != 0)