From: Jon Harrop <jon@ffconsultancy.com>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] evaluation order
Date: Sun, 14 Jun 2009 20:40:47 +0100 [thread overview]
Message-ID: <200906142040.47645.jon@ffconsultancy.com> (raw)
In-Reply-To: <4A352717.7020909@univ-savoie.fr>
On Sunday 14 June 2009 17:36:39 Christophe Raffalli wrote:
> Hello,
>
> In OCaml-3.11.1 (I did not try other version),
> the following code print 0 when compiled in bytecode and 1 in nativecode
> for obvious reason of different evaluation order in the pair ...
>
>
> let ptr = ref 0
> let fn b =
> if b then incr ptr else decr ptr
> let c = fn true, !ptr
> let _ = print_int (snd c); print_newline ()
>
> Is any difference between ocamlc and ocamlopt a bug ?
Not at all, no. They are expected to have different behaviour with respect to
floating point arithmetic. In this case, they have chosen to evaluate
subexpressions in a different order, which is fine because the order of
evaluation is officially undefined.
--
Dr Jon Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com/?e
next prev parent reply other threads:[~2009-06-14 19:35 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-14 16:36 Christophe Raffalli
2009-06-14 17:45 ` Rémi Vanicat
2009-06-14 19:40 ` Jon Harrop [this message]
2009-06-14 21:12 ` [Caml-list] " Christophe Raffalli
-- strict thread matches above, loose matches on Subject: below --
2001-06-15 17:00 [Caml-list] Evaluation Order Manuel Fahndrich
2001-06-10 17:59 Damien Doligez
2001-06-10 18:28 ` Dave Mason
2001-06-10 2:44 David McClain
2001-06-10 2:48 ` Patrick M Doane
2001-06-10 5:51 ` David McClain
2001-06-09 15:59 David McClain
2001-06-09 20:17 ` Brian Rogoff
2001-06-09 23:12 ` David McClain
2001-06-09 23:28 ` David McClain
2001-06-10 1:04 ` Dave Mason
2001-06-10 2:25 ` David McClain
2001-06-11 13:03 ` Dave Mason
2001-06-12 17:55 ` John Max Skaller
2001-06-13 16:54 ` Frederick Smith
2001-06-13 21:43 ` John Max Skaller
2001-06-10 1:06 ` Charles Martin
2001-06-10 2:27 ` David McClain
2001-06-10 11:18 ` Tore Lund
2001-06-10 13:11 ` Tore Lund
2001-06-10 14:31 ` John Max Skaller
2001-06-12 15:12 ` Pierre Weis
2001-06-10 10:40 ` Joerg Czeranski
2001-06-10 14:06 ` John Max Skaller
2001-06-11 12:59 ` Dave Mason
2001-06-12 17:34 ` John Max Skaller
2001-06-10 13:47 ` John Max Skaller
2001-06-10 16:47 ` Brian Rogoff
2001-06-10 17:27 ` Dave Mason
2001-06-12 16:10 ` John Max Skaller
2001-06-09 23:19 ` John Max Skaller
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