Re: [PATCH] Implement ipa_vr hashing.

[Aldy Hernandez via Gcc-patches]

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On Sat, Jun 10, 2023 at 10:30 PM Aldy Hernandez <al...@redhat.com> wrote:
>
>
>
> On 5/29/23 16:51, Martin Jambor wrote:
> > Hi,
> >
> > On Mon, May 22 2023, Aldy Hernandez via Gcc-patches wrote:
> >> Implement hashing for ipa_vr.  When all is said and done, all these
> >> patches incurr a 7.64% slowdown for ipa-cp, with is entirely covered by
> >> the similar 7% increase in this area last week.  So we get type agnostic
> >> ranges with "infinite" range precision close to free.
> >
> > Do you know why/where this slow-down happens?  Do we perhaps want to
> > limit the "infiniteness" a little somehow?
>
> I addressed the slow down in another mail.
>
> >
> > Also, jump functions live for a long time, have you looked at how memory
> > hungry they become?  I hope that the hashing would be good at preventing
> > any issues.
>
> On a side-note, the caching does help.  On a (mistaken) hunch, I had
> played around with removing caching for everything but UNDEFINED/VARYING
> and zero/nonzero to simplify things, but the cache hit ratio was still
> surprisingly high (+80%).  So good job there :-).
>
> >
> > Generally, I think I OK with the patches if the impact on memory is not
> > too bad, though I guess they depend on the one I looked at last week, so
> > we may focus on that one first.
>
> I'm not sure whether this was an OK for the other patches, given you
> approved the first patch, so I'll hold off until you give the go-ahead.
>
> Thanks.
> Aldy