From: Florent Monnier <fmonnier@linux-nantes.fr.eu.org>
To: caml-list@yquem.inria.fr
Cc: Jon Harrop <jon@ffconsultancy.com>
Subject: Re: [Caml-list] Using OCaml's run-time from LLVM-generated native code
Date: Wed, 6 Feb 2008 00:08:08 +0100 [thread overview]
Message-ID: <200802060008.08563.fmonnier@linux-nantes.fr.eu.org> (raw)
In-Reply-To: <200802041336.22550.jon@ffconsultancy.com>
Hi,
Jon Harrop wrote:
> int apply(int n) {
> CAMLparam0();
> CAMLlocal2(nv, fibn);
> nv = copy_int64(n);
> fibn = fib(nv);
> caml_gc_full_major(0);
> CAMLreturn(Int64_val(fib(nv)));
> }
>
> Is that correct?
>
> Next, this C code is 4x slower than the ocamlopt-generated equivalent. What
> can be done to improve its performance without leaving C?
I don't know if it is a typo from you, or if it is me that don't understand
the code, but it seems that fib(nv) is computed twice.
Shouldn't the second one be replaced by fibn, the result of the first one?
prev parent reply other threads:[~2008-02-05 23:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-01 21:24 Jon Harrop
2008-02-03 21:24 ` [Caml-list] " Alain Frisch
2008-02-03 23:19 ` Jon Harrop
2008-02-04 7:03 ` Alain Frisch
2008-02-04 10:32 ` Jon Harrop
2008-02-04 11:11 ` Alain Frisch
2008-02-04 13:36 ` Jon Harrop
2008-02-04 15:20 ` Alain Frisch
2008-02-05 23:08 ` Florent Monnier [this message]
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