From: Christophe TROESTLER <Christophe.Troestler+ocaml@umh.ac.be>
To: dmitry.bely@gmail.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Re: Question about float refs.
Date: Wed, 01 Sep 2010 09:46:07 +0200 (CEST) [thread overview]
Message-ID: <20100901.094607.1753910472605096940.Christophe.Troestler+ocaml@umons.ac.be> (raw)
In-Reply-To: <AANLkTimWwzasrCYA2FHg+Kn_CN_yLBerWRDsSyqBrYgT@mail.gmail.com>
On Wed, 1 Sep 2010 11:18:05 +0400, Dmitry Bely wrote:
>
> >> Some black magic is needed:
> >>
> >> let r = ref 0.0 in
> >> for i = 0 to 1000_000_000 do r := float i done;
> >> Printf.printf "%f\n" (!r +. 0.);
> >> Printf.printf "words: %f\n" (Gc.stat ()).Gc.minor_words
>
> Do you have any idea why the optimizer needs that?
It helps the compiler to figure out that “r” must be unboxed.
See also http://caml.inria.fr/mantis/view.php?id=5133
C.
next prev parent reply other threads:[~2010-09-01 7:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-19 11:52 Ethan Burns
2010-08-19 13:14 ` [Caml-list] " Lukasz Stafiniak
2010-08-19 13:34 ` David House
2010-08-19 13:49 ` Till Varoquaux
2010-08-23 12:06 ` Christophe TROESTLER
2010-08-23 12:14 ` Ethan Burns
2010-08-23 12:42 ` Sylvain Le Gall
2010-08-23 13:00 ` [Caml-list] " Dmitry Bely
2010-08-31 19:41 ` Jon Harrop
2010-09-01 7:18 ` Dmitry Bely
2010-09-01 7:46 ` Christophe TROESTLER [this message]
2010-09-01 8:31 ` Fabrice Le Fessant
2010-09-01 9:54 ` Ethan Burns
2010-09-01 12:29 ` Fabrice Le Fessant
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100901.094607.1753910472605096940.Christophe.Troestler+ocaml@umons.ac.be \
--to=christophe.troestler+ocaml@umh.ac.be \
--cc=caml-list@inria.fr \
--cc=dmitry.bely@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox