https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93009
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #2) > It is called fma but it does not have to do the fused multiple add. > For scalar types, you should use std::fma . BUT NOTE on targets where FMA > does not exist, the function std::fma can be slow as the multiple is done in > infinite precision. That really depends on the libm implementation, e.g. glibc uses algorithm from the http://www.lri.fr/~melquion/doc/08-tc.pdf paper.
