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

[rguenth at gcc dot gnu.org]

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

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
And you need -fno-trapping-math to allow if-conversion.  Then things are fast.