From: Jon Harrop <jonathandeanharrop@googlemail.com>
To: "'Dmitry Bely'" <dmitry.bely@gmail.com>, <caml-list@inria.fr>
Subject: RE: [Caml-list] Re: Question about float refs.
Date: Tue, 31 Aug 2010 20:41:09 +0100 [thread overview]
Message-ID: <031b01cb4944$77110900$65331b00$@com> (raw)
In-Reply-To: <AANLkTi=FpYr=q5aNo4B1tGEc6te9-hAZtqPZricGO06z@mail.gmail.com>
You might prefer to multiply by 1.0 because adding 0.0 changes -0.0.
Cheers,
Jon.
> 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
>
> and the reference will be placed in a register (Caml heap will not be
> used inside the loop)
>
> - Dmitry Bely
next prev parent reply other threads:[~2010-08-31 19:41 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 [this message]
2010-09-01 7:18 ` Dmitry Bely
2010-09-01 7:46 ` Christophe TROESTLER
2010-09-01 8:31 ` Fabrice Le Fessant
2010-09-01 9:54 ` Ethan Burns
2010-09-01 12:29 ` Fabrice Le Fessant
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