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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);
}