# elif defined(__GNUC__) && __GNUC__>=2
#  if defined(__x86_64) || defined(__x86_64__)
#   if defined(L_ENDIAN)
#    define ROTATE(a,n)       ({ u64 ret; asm ("rolq %1,%0"   \
                                   : "=r"(ret) : "J"(n),"0"(a) : "cc"); ret; })
#   elif defined(B_ENDIAN)
       /*
        * Most will argue that x86_64 is always little-endian. Well, yes, but
        * then we have stratus.com who has modified gcc to "emulate"
        * big-endian on x86. Is there evidence that they [or somebody else]
        * won't do same for x86_64? Naturally no. And this line is waiting
        * ready for that brave soul:-)
        */
#    define ROTATE(a,n)       ({ u64 ret; asm ("rorq %1,%0"   \
                                   : "=r"(ret) : "J"(n),"0"(a) : "cc"); ret; })
#   endif