Comment by hollowonepl

I did not know that pointer indexing registers had direct low byte access, like `si/esi` (in 16/32bit when I last time used assemblers directly) that comes with `sil` as `ax/eax` analogy to `al`. Are there really opcodes for that that were added in the later evolution of x86_64? Seems I need to double check the specs of the platform again... out of plain curiosity!