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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [gcc/] [testsuite/] [gcc.dg/] [duff-3.c] - Blame information for rev 12

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Line No. Rev Author Line
1 12 jlechner
/* Duff's device is legal C; test to make sure the compiler
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   doesn't complain about it.
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   Jason Thorpe <thorpej@wasabisystems.com>
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   Derived from Tom Duff's original usenet message about the device.  */
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/* { dg-do run } */
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/* { dg-options "-O2" } */
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extern void abort (void);
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extern void exit (int);
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typedef __SIZE_TYPE__ size_t;
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extern int memcmp (const void *, const void *, size_t);
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void
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duffcpy (char *dst, const char *src, unsigned long size)
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{
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  unsigned long n = (size + 7) / 8;
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  switch (size % 8)
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    {
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    case 0:      do {    *dst++ = *src++;
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    case 7:             *dst++ = *src++;
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    case 6:             *dst++ = *src++;
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    case 5:             *dst++ = *src++;
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    case 4:             *dst++ = *src++;
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    case 3:             *dst++ = *src++;
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    case 2:             *dst++ = *src++;
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    case 1:             *dst++ = *src++;
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                } while (--n > 0);
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    }
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}
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const char testpat[] = "The quick brown fox jumped over the lazy dog.";
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int
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main()
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{
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  char buf[64];
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  duffcpy (buf, testpat, sizeof (testpat));
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  if (memcmp (buf, testpat, sizeof (testpat)) != 0)
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    abort ();
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  exit (0);
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}

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