&gt;PADDSW<p>As I see it that&#x27;s a variant of PADDW, so whatever PADDW does is what matters, and PADDW does twos complement.<p>&gt;DAA and AAA<p>I thought about calling those out, I think it&#x27;s stretching too much to refer to an archaic instruction that works on &#x27;ascii&#x27; or such when we&#x27;re figuring the behavior of &#x27;integers&#x27;.  Even if it is one byte.