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[Bug target/30052] possible quadratic behaviour.
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Feb 2007 16:17:10 -0000
- Subject: [Bug target/30052] possible quadratic behaviour.
- References: <bug-30052-7667@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #10 from dberlin at gcc dot gnu dot org 2007-02-13 16:17 -------
Subject: Re: possible quadratic behaviour.
On 13 Feb 2007 10:37:55 -0000, pluto at agmk dot net
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #9 from pluto at agmk dot net 2007-02-13 10:37 -------
> (In reply to comment #8)
> > Does this work on mainline with no real issue?
> >
> > If so, i'll try to backport the solver changes.
> >
>
> gcc43 works faster, but still needs lot of memory.
Yeah, but you need to show me that the reason it needs a lot of memory
is due to pta:
>
> (...)
> tree PTA : 1.33 ( 2%) usr 0.01 ( 1%) sys 1.41 ( 2%) wall
> 10753 kB ( 2%) ggc
> tree alias analysis : 14.10 (21%) usr 0.08 ( 8%) sys 14.75 (21%) wall
> 55882 kB (10%) ggc
> (...)
> TOTAL : 68.67 1.03 71.55
> 537971 kB
>
Except that 55 meg and 10 meg of 512meg of gc memory is not a lot,
relatively speaking (It's not like it's 90% of the ggc memory or
something).
Also, alias analysis and PTA use heap memory that will not show up here.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30052