https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63155
--- Comment #41 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org>
---
(In reply to Richard Biener from comment #39)
> Oh, and backprop is really intersect_uses () with
>
> FOR_EACH_IMM_USE_STMT (stmt, iter, var)
> {
>
> being quadratic due to its stupid implementation (we really have many uses
> of vars).
Ouch, hadn't realised the difference between them was that severe.
> If the pass can deal with duplicate stmt uses just fine using
> FOR_EACH_IMM_USE_FAST is going to be faster.
Yeah, should be fine here, since the function is just gathering
information. Testing a patch...
