From: Chris Hecker <checker@d6.com>
To: Fabrice Popineau <Fabrice.Popineau@supelec.fr>,
Lionel Fourquaux <lionel.fourquaux@wanadoo.fr>
Cc: caml-list@pauillac.inria.fr
Subject: Re: RE : [Caml-list] building ocaml 3.02 under win32
Date: Mon, 17 Sep 2001 10:49:31 -0700 [thread overview]
Message-ID: <4.3.2.7.2.20010917104431.02a3fa90@arda.pair.com> (raw)
In-Reply-To: <7kv1a6c3.fsf@supelec.fr>
>In fact, the problem was that I tried to compile the whole system
>using the default __fastcall IA32 convention of MSVC (it will use up
>to 2 registers to pass parameters to functions, resulting in less
>overhead). I was wondering about how much could be gained.
> ...
> The changes needed to cope with this are beyond the time I can spend
>on it right now, but I'm pretty sure it could be result in
>significative better performances.
I'd be interesting in finding out as well, but I woudln't be so sure it will result in a win. The problem with register calling conventions is that often the called function has to spill everything onto the stack anyway to do its own work, resulting in slower and bigger code. Without going through and adding fastcall by hand to leaf functions, it's hard to tune this behavior. Mike Abrash wrote an article in DDJ about this years ago that might still be relevant.
Chris
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next prev parent reply other threads:[~2001-09-17 17:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-11 20:05 Fabrice Popineau
2001-09-12 16:34 ` RE : " Lionel Fourquaux
2001-09-14 20:02 ` Fabrice Popineau
2001-09-17 17:49 ` Chris Hecker [this message]
2001-09-15 23:55 ` [Caml-list] newbie CTL3D32 ocaml win32 Kevin Rowanet
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