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

   doesn't complain about it.

   Roger Sayle <roger@eyesopen.com>

   Derived from duff-2.c.  */

/* { dg-do run } */

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

extern void abort (void);

extern void exit (int);

#if __INT_MAX__ >= 2147483647

/* At least 32-bit integers. */

typedef int type32;

#else

typedef long type32;

#endif

type32

cksum (const unsigned char *src, unsigned long size)

{

  type32 ck = 0;

  switch (size & 3)

    {

    do

      {

    case 0:

        ck ^= (type32)*src++ << 24;

        --size;

    case 3:

        ck ^= (type32)*src++ << 16;

        --size;

    case 2:

        ck ^= (type32)*src++ << 8;

        --size;

    case 1:

        ck ^= (type32)*src++;

        --size;

      }

    while (size > 0);

    }

  return ck;

}

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

int

main()

{

  type32 ck;

  ck = cksum ((const unsigned char *) testpat, sizeof (testpat));

  if (ck != 925902908)

    abort ();

  exit (0);

}