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/* Duff's device is legal C; test to make sure the compiler

   doesn't complain about it.

   Jason Thorpe <thorpej@wasabisystems.com>

   Derived from PR 3846.  */

/* { dg-do run } */

/* { dg-options "-O2" } */

extern void abort (void);

extern void exit (int);

typedef __SIZE_TYPE__ size_t;

extern int memcmp (const void *, const void *, size_t);

void

duffcpy (char *dst, const char *src, unsigned long size)

{

  switch (size & 3)

    {

    for (;;)

      {

        *dst++ = *src++;

    case 3:

        *dst++ = *src++;

    case 2:

        *dst++ = *src++;

    case 1:

        *dst++ = *src++;

    case 0:

        if (size <= 3)

          break;

        size -= 4;

      }

    }

}

const char testpat[] = "The quick brown fox jumped over the lazy dog.";

int

main()

{

  char buf[64];

  duffcpy (buf, testpat, sizeof (testpat));

  if (memcmp (buf, testpat, sizeof (testpat)) != 0)

    abort ();

  exit (0);

}