https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109154
--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Richard Biener from comment #18) > Hmm, I guess if users enable FTZ we could instruct them to tell that to > the compiler, but requiring -funsafe-math-optimizations is quite a > difficult suggestion here. Maybe we can add a special -fftz flag for I think people rarely enable FTZ by hand, they enable it by linking in crtfastmath through linking with -Ofast/-ffast-math/-funsafe-math-optimizations. And, enabling FTZ is such an unsafe math optimization already, it violates IEEE 754 to gain some extra performance.
