------- Comment #8 from law at redhat dot com 2005-11-04 20:10 -------
Subject: Re: [4.1 Regression] jump threading
causing excessive code duplication
On Mon, 2005-10-31 at 18:56 -0700, Jeffrey A Law wrote:
> On Mon, 2005-10-31 at 03:43 +0000, mmitchel at gcc dot gnu dot org
> wrote:
> >
> > ------- Comment #5 from mmitchel at gcc dot gnu dot org 2005-10-31 03:43
> > -------
> > Downgraded to P2. Important, but not a showstopper. We really should have
> > some kind of throttle, even if it's a bit simplistic.
> We could easily put in a trivial throttle. If there's more than N
> statements + phis, then the block is considered not threadable. Choose
> N and it'll take about 5 minutes of work (and 3 hours to test :-)
>
> I'll throw out 50 as a very very very conservative number. If we're OK
> with that number, then let's do it.
>
> We might be better around 10, but 50 ought to catch the pathological
> cases without impacting much of anything.
Here's what I actually checked in. This should be enough to allow
us to delay final resolution of this PR till 4.2 (probably using
Steven's prototype, which I like better).
Bootstrapped and regression tested on i686-pc-linux-gnu.
------- Comment #9 from law at redhat dot com 2005-11-04 20:10 -------
Created an attachment (id=10148)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10148&action=view)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21883
