[Bug tree-optimization/90316] [8/9 Regression] large compile time increase in opt / alias stmt walking for Go example

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90316

--- Comment #26 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #25)
> OK, so the hashtable looks good.  But
> 
> 135 pre "insert iterations == 1084" 1
> 
> is indeed excessive.  Expecially combined with
> 
> 135 pre "Insertions" 3

Ah, but

135 pre "New PHIs" 1085

so we're inserting a PHI per iteration appearantly... :/

> I wonder if you can share the full -fdump-tree-pre-details dump (it's
> going to be large though).

So the insertion possibly excessively iterates.