On Thu, Oct 27, 2011 at 8:21 AM, Paolo Carlini <pcarlini@gmail.com> wrote: > Hi again, >> >> Hmm, why is the test of the form x < 0.0, and not testing the sign of x? > > Actually, we can as well use the std::abs, no? > > Paolo The point of using sign is so that signed zero is not mischaracterized, especially when cut branch is at issue.