From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: Will M Farr <farr@MIT.EDU>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Optimizing Float Ref's
Date: Thu, 03 Sep 2009 11:44:53 +0200 [thread overview]
Message-ID: <4A9F9015.2010408@inria.fr> (raw)
In-Reply-To: <D3041D62-4F8D-4121-8CEF-5EE810D8FFA6@MIT.EDU>
> I'm running OCaml 3.11.1, and I noticed something strange in some native
> code for matrix multiply today. The code was
> [...]
> [Local float ref being unboxed or not? ]
You omitted the definition of "dims", but after adding the obvious
definition, the float ref "sum" is indeed completely unboxed and is
kept in a float register (on x86-64 bits) or stack location (on x86-32
bits). No "modify" takes place in the inner loop. So, I don't
understand the problem you observed. Feel free to post a report on
the BTS with a *complete* piece of code that reproduces the problem.
> But, I thought that float ref's were automatically unboxed by the
> compiler when they didn't escape the local context.
Yes, if all uses of the float ref are unboxed, which is the case in
your code.
- Xavier Leroy
next prev parent reply other threads:[~2009-09-03 9:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-28 20:32 Will M Farr
2009-08-30 19:43 ` [Caml-list] " Yaron Minsky
2009-08-31 14:09 ` Till Varoquaux
2009-08-31 14:51 ` Will M Farr
2009-08-31 17:30 ` Jon Harrop
2009-08-31 17:15 ` Jon Harrop
2009-09-03 9:44 ` Xavier Leroy [this message]
2009-09-03 10:15 ` Will M Farr
2010-03-31 17:21 ` Dmitry Bely
[not found] ` <p2tc7e4e9f1003311055xce0919wac2118aa3c05f1cb@mail.gmail.com>
2010-03-31 18:28 ` Dmitry Bely
2010-03-31 18:59 ` Alain Frisch
2010-03-31 19:18 ` Dmitry Bely
[not found] ` <m2lfbd71dab1003311252v5bda5d13vc2146d2d24270847@mail.gmail.com>
2010-03-31 20:00 ` Dmitry Bely
2010-04-14 18:13 ` Goswin von Brederlow
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