[Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466

--- Comment #12 from Marc Glisse <glisse at gcc dot gnu.org> ---
Constant folding for nextafter seems like a useful thing to add, whatever we
say about the rest of the testcase.