Re: [eigen] Re: meeting in February?

[Benoit Jacob <jacob.benoit.1@xxxxxxxxx>]

Hi,

I'm very happy to announce a special guest at the meeting!

Dodji Seketeli is the G++ developer who's currently taking care of our
bug report, http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42225

Keep him in CC !

He'll be able to come at the meeting, which is an awesome opportunity for us:
 - to let a G++ developer know about our needs;
 - to ask questions about how to help the compiler to produce optimized code;
 - to ask questions about how to write code that doesn't take too long
to compile;
 - generally to understand how a C++ compiler looks at Eigen;
 - etc.

Dodji can also do a presentation about G++ stuff for us. It would be
very useful to discuss first what we are most interested to learn
about!

Personnally, what I am the most interested in is to understand what
happens in the C++ front-end, aka G++. Good coincidence: that's
exactly what Dodji is most expert about, AFAIK. I'm pretty sure also
that listening to a presentation about G++ would also be enlightening
about C++ in general, and would help understanding issues not specific
to GCC.

So for example, what I would love is if we could study a short C++
program with some templates, typedefs etc, and examine together how
G++ handles it, step-by-step.

After a very simple example we could move on to a more involved
example directly taken from Eigen.

Another thing that I would be thrilled to listen to, is how to get
more information about how G++ handled a particular file. Indeed, when
we notice bad performance on some program, currently all we can look
at is the generated assembly. It would be nice if we could get
information about what the front-end did without going all the way to
the asm. Perhaps Dodji could show us how to get such clues!

What's your opinion? Would you rather be interested in other aspects,
in general GCC architecture, etc?

Benoit

2009/12/12 Benoit Jacob <jacob.benoit.1@xxxxxxxxx>:
> Some updates regarding the meeting room:
>
> - full confirmation from my parents that it's not a problem at all to
> use their dining room as a meeting room
> - my father can provide a videoprojector from his workplace, and we
> have a white screen.
> - on other news, Thomas has a potential possibility with a company in
> Paris, so please keep us updated, it is still interesting.
>
> Benoit
>
> 2009/12/10 Benoit Jacob <jacob.benoit.1@xxxxxxxxx>:
>> This is great!
>>
>> If Jitse also comes, we're then 6 people which is more or less the
>> maximum we can reasonably do with our current possibilities for
>> meeting rooms.
>>
>> Benoit
>>
>> PS. i guess you know this one but anyway: " -- T'habites
>> Bourg-la-Reine? ou t'habites Choisy-le-Roi? -- Non, ma... euh j'habite
>> porte des lilas."
>>
>> 2009/12/10 Mathieu Gautier <mathieu.gautier@xxxxxx>:
>>> Hi,
>>>
>>> Since I'm living near Paris (Bourg-La-Reine, RER B). I can easily be there.
>>> I can also host someone in my living room, if there's funding or/and
>>> accommodation issues.
>>>
>>> For the meeting room, it may be easier to be hosted by one of the
>>> universities of Paris, but I don't know if it's possible.
>>>
>>> --
>>> Mathieu
>>>
>>>
>>>
>>
>