Note that this post is about changing the order of bits within a byte (eg. x86-64 XOP instruction VPPERM with bit reversal option). Whereas you are talking abou

Note that this post is about changing the order of bits within a byte (eg. x86-64 XOP instruction VPPERM with bit reversal option). Whereas you are talking about changing the order of bytes within a word (x86 instruction BSWAP).