https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68753
David Edelsohn <dje at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2016-01-19 Ever confirmed|0 |1 --- Comment #1 from David Edelsohn <dje at gcc dot gnu.org> --- For double precision what? Because of the number of iterations required for double precision, it's not clear that this truly is a win for sqrt. Double precision __builtin_recip and __builtin_rsqrt are available.