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Hello,
AFL in 4.30.0 and all earlier versions was interpreted directly.
AFL in 4.31.0 and higher versions is first parsed and a tree structure is built
first. Tree holds encoded information about parameters/function calls etc.
Then a tree-walker executes actions descibed by this tree.
This design makes it much faster to execute loops and user-defined functions.
This is so because loop body and function body is parsed only ONCE
and can be executed many times without re-parsing.
This makes it 3-10x faster than Microsoft JScript and VBScript.
Example
The following formulas do 4 million iterations, each consisting of one multiplication, one sine calculation,
one addition and one assignment.
// NATIVE CODE - executes in 2 seconds on my Athlon XP 1700
"Native loop start " + Now();
x = 0;
for( i = 0; i < 4000; i++ )
for( j = 0; j < 1000; j++ )
x = x + sin(i*j);
"Native loop end " + Now();
// JSCRIPT CODE - executes in 10 seconds on my Athlon XP 1700
EnableScript("jscript");
"JScript loop start " + Now();
<%
y = 0;
for( i = 0; i < 4000; i++ )
for( j = 0; j < 1000; j++ )
y = y + Math.sin(i*j);
%>
"JScript loop end " + Now();
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Metasan" <mdhuang@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Thursday, July 03, 2003 4:48 PM
Subject: [amibroker] Re: AFL Question.
> --- In amibroker@xxxxxxxxxxxxxxx, "Michael.S.G." <OzFalcon@xxxx>
> wrote:
> >
> > Is AFL compiled when it is run in amibroker?
> >
> > Thanks
> > Michael.
>
> Maybe only TJ can answer this question. But I would guess that AFL is
> a interpretation language. The AB engine is a very efficient and fast
> interpreter. It can also be on-the-fly compilation, but I doubt that
> based on how it behaves.
>
>
>
>
> Send BUG REPORTS to bugs@xxxxxxxxxxxxx
> Send SUGGESTIONS to suggest@xxxxxxxxxxxxx
> -----------------------------------------
> Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> --------------------------------------------
> Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
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Send BUG REPORTS to bugs@xxxxxxxxxxxxx
Send SUGGESTIONS to suggest@xxxxxxxxxxxxx
-----------------------------------------
Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
(Web page: http://groups.yahoo.com/group/amiquote/messages/)
--------------------------------------------
Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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