&quot;ascii adjust after addition&quot;<p>&gt; Nope, PADDW is a variant of PADDSW, so whatever PADDSW does is what matters, and PADDSW does saturating addition.<p>That&#x27;s like arguing that Red Sports Car is a variant of Red Sports Car with Stripes.  The one that adds adjectives is the variant, the one without those adjectives is the base.<p>If PADDW did saturating arithmetic and PADDWW did wrapping, I would agree with you, but that&#x27;s not how x86 works.