OpenEuphoria

Re: type string

• Posted by Roderick Jackson <rjackson at CSIWEB.COM> Mar 16, 1999
• 470 views

Whoa! That's nice! Over 18% speed increase (over 35% for long strings.)

You know, this all started as a question, and took off into a fairly =
profitable intellectual exercise... I'm really learning a lot from all =
of this. 

I think we need to gather all of these speed-boosting tips together; I =
know I didn't see THIS one in the Euphoria docs.


Rod Jackson

----------
From:   Mike[SMTP:michael at IGRIN.CO.NZ]
Sent:   Tuesday, March 16, 1999 1:54 AM
To:     EUPHORIA at LISTSERV.MUOHIO.EDU
Subject:        Re: type string

Hey guys,
    why not try using:

if c < 0 then
    return 0
elsif c > 255 then
    return 0
end if

instead of:

if (c < 0) or (c > 255) then
    return 0
end if

I seem to recall that in the ABS() wars the multi IF block was faster =
than
the single-liner code.
(compare the function fast_lower() in C:\Euphoria\Bin\Search.ex )

michael at igrin.co.nz

-----Original Message-----
From: Boehme, Gabriel <gboehme at MUSICLAND.COM>
To: EUPHORIA at LISTSERV.MUOHIO.EDU <EUPHORIA at LISTSERV.MUOHIO.EDU>
Date: Tuesday, March 16, 1999 8:52 AM
Subject: Re: type string


>Daniel Berstein <daber at PAIR.COM> wrote:
>
>>>Running on a PII 200mHz in DOS under WinNT:
>>> -------------------------------------------
>>>exw strbench 100000 6
>>>
>>>string6z() - 0.001285 "c<0" replaced with "c<1"
>>>string6()  - 0.001288
>>>string6s() - 0.001304 "not sequence(s)" replaced with "atom(s)"
>>>string6i() - 0.001324 "integer(c)" replaced with "atom(c)"
>>>string()   - 0.001344
>>>
>
>[snip]
>
>>BTW I avoided some of the randomness of the benchmark under NT using
>>exw.exe instead of ex.exe (and the numbers returned are much more =
"real"
>>than those 0.00xxx seconds ex.exe gives).
>
>
>You're right:
>
>Running EXW in WinNT:
> ---------------------
>exw strbench 400000 6
>
>string8  -- 5.890000 almost identical to string6 [see below]
>string6i -- 6.020000 "integer(c)" replaced with "atom(c)"
>string   -- 6.096667
>string6z -- 6.165000 "c<0" replaced with "c<1"
>string6  -- 6.173333
>string8i -- 6.241667 almost identical to string6i [see below]
>string6s -- 6.273333 "not sequence(s)" replaced with "atom(s)"