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From: "Jeffrey R. Carter" <spam.not.jrcarter@acm.not.spam.org>
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Subject: Re: ada is getting spanked :(
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Date: 2006-10-29T02:13:33+00:00
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Georg Bauhaus wrote:
> 
> In order to optimize GNAT's standing, I have made a small
> but quite effective change to one of Jim Rogers' programs
> (regex-dna #2), the factor is 14 (fourteen). Nothing submitted
> yet, please use this as a starting point if you like.

I've found a small change that improves the nsieve program (also Jim 
Rogers). Change the line

S (I) := False;

to

if S (I) then
    S (I) := False;
end if;

on my computer (3.2 GHz Pentium 4 HT), compiled with MinGW GNAT 3.4.2 with

-O3 -gnatnp -march=pentium4 -fomit-frame-pointer

the time was reduced from about 1.8 s for the original to about 1.1 s 
with this modification, a speedup of 38.9%. Applied to the 2.71 s 
reported time, that would give GNAT 1.66 s, which would move it to 3rd 
place.

I hope no one thinks we're picking on Jim.

-- 
Jeff Carter
"Your mother was a hamster and your father smelt of elderberries."
Monty Python & the Holy Grail
06