https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68110
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Marc Glisse from comment #4) > but since we don't > have any pass to generate __builtin_sub_overflow from a-b and a<b and don't > CSE __builtin_sub_overflow with either of those, I am a bit wary of dropping > the builtin too early. That changed in GCC 10 IIRC.
