Actually, it's mostly integer instructions. Regehr even has a related post, "Integer Undefined Behaviors in Open Source Crypto Libraries": http://blog.regehr.or

Actually, it's mostly integer instructions. Regehr even has a related post, "Integer Undefined Behaviors in Open Source Crypto Libraries": http://blog.regehr.org/archives/1054 http://blog.regehr.org/archives/1054 His blog, academic papers, and the paper I linked, have lots of discussions about integer issues.