https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54089
--- Comment #49 from Oleg Endo <olegendo at gcc dot gnu.org> --- (In reply to Alexander Klepikov from comment #48) > Let's continue discussion we started here: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49263 > > I've found that my patch catches integer division. In short, it appears to > work unpredictable. It looks like there's no easy way to catch right shift. What do you mean it catches integer division? There could be several places during compilation, where the compiler will try to convert integer division to right shifts. But it will not do so unless it's wrong. The patterns you have added shouldn't match a division operation.
