[Bug middle-end/82853] Optimize x % 3 == 0 without modulo

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82853

--- Comment #36 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Orr Shalom Dvory from comment #35)
> Hi, thanks for your respond. can someone mark this bug as need to be
> improved?
> Does anyone agree/disagree with my new proposed method?

It's best to create a new bug if there are still easy cases that could be
optimized. Also it seems the constants it uses are quite complex - it may be
feasible to simplify them. Eg. long f(long x) { return x % 35 == 0; }