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/* { dg-do run } */

/* { dg-require-effective-target stdint_types } */

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

#include <stdint.h>

extern void abort (void);

uint64_t __attribute__((noinline))

byteswap64(uint64_t x)

{

  uint32_t a = x >> 32;

  uint32_t b = (uint32_t) x;

  return ((uint64_t) ((((((b)) >> (8)) | (((b)) << (32 - (8)))) & 0xff00ff00L)

                      | (((((b)) << (8)) | (((b)) >> (32 - (8)))) & 0x00ff00ffL)) << 32)

          | (uint64_t) ((((((a)) >> (8)) | (((a)) << (32 - (8)))) & 0xff00ff00L)

                        | (((((a)) << (8)) | (((a)) >> (32 - (8)))) & 0x00ff00ffL));

}

int

main ()

{

  uint64_t in = (uint64_t)0x01020304 << 32 | 0x05060708;

  uint64_t cmp = (uint64_t)0x08070605 << 32 | 0x04030201;

  if (cmp != byteswap64 (in))

    abort ();

  return 0;

}