Hello everyone, I have got interesting results from my test of SSE2
switch.
I tested a small code fragment with and without SSE2 swith and I Saw no
difference.
Why is this?
Iused FPC 2.0 on WIN 32 to compile it with Best optimization
Code fragment follows:
{$fputype sse2}
program divide;
uses windows;
var time1,time2:dword;
a,b,c:double;
i,j:dword;
begin
a:=123456789.1234567;
b:=1.987654587;
for i:=1 to 3 do
begin
time1:=gettickcount;
for j:=1 to 100000000 do c:=a/b;
time2:=gettickcount;
writeln('time ',i,' ',(time2-time1)/1000:0:3);
end;
end.The Time I measured was from 3 sec to 1,6 sec. I didn't use very exact method of measurement but...
Any help or idea would be appreciated.
Pianoman
P.S. program was ran on P4 with SSE
----- Original Message ----- 2 2,4g
Hz.
From:
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Sent: Thursday, June 02, 2005 12:00 PM
Subject: fpc-pascal Digest, Vol 10, Issue 2
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Today's Topics:
1. Re: Past list archives (Gerhard Scholz)
2. Re: Past list archives (Vincent Snijders)
3. Re: Optimizer in 2.0 (Florian Klaempfl)
4. Re: Optimizer in 2.0 (Adrian Veith)
----------------------------------------------------------------------
Message: 1
Date: Wed, 1 Jun 2005 12:51:40 +0200
From: "Gerhard Scholz"
Subject: Re: [fpc-pascal] Past list archives
To: "FPC-Pascal users discussions"
Message-ID:
Content-Type: text/plain; charset="iso-8859-1"
Sorry,
that list mentioned below:
http://www.freepascal.org/mailist.html
is dead.
(Objekt nicht gefunden! Der angeforderte URL konnte auf dem Server nicht
gefunden werden.)
Greetings
Gerhard
----- Original Message -----
From: "Jonas Maebe"
To: "Mike's Mail" ; "FPC-Pascal users
discussions"
Show quoted text 153 lines
Sent: Sunday, May 29, 2005 2:38 PM
Subject: Re: [fpc-pascal] Past list archives
>
> On 25 May 2005, at 14:47, Mike's Mail wrote:
>
> > Is there an active link for the archives that works, or who would I
> > contact to report the link, so it may be fixed?
>
> Yes, working links can be found on http://www.freepascal.org/
> maillist.html
>
>
> Jonas
>
> PS: please turn off html posting in your mail client, it causes your
> posts to be held for approval (because the rule that stops such mails
> it also stops all viruses I know of)
>
>
> _______________________________________________
> fpc-pascal maillist -
> http://lists.freepascal.org/mailman/listinfo/fpc-pascal
>
------------------------------
Message: 2
Date: Wed, 01 Jun 2005 13:30:38 +0200
From: Vincent Snijders
Subject: Re: [fpc-pascal] Past list archives
To: FPC-Pascal users discussions
Message-ID:
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gerhard Scholz wrote:
> Sorry,
>
> that list mentioned below:
>
> http://www.freepascal.org/mailist.html
>
> is dead.
but http://www.freepascal.org/maillist.html isn't.
Vincent.
------------------------------
Message: 3
Date: Wed, 01 Jun 2005 14:06:44 +0200
From: Florian Klaempfl
Subject: Re: [fpc-pascal] Optimizer in 2.0
To: FPC-Pascal users discussions
Message-ID:
Content-Type: text/plain; charset=us-ascii
Adrian Veith wrote:
> It shows with useless code like simple nested for .. to loops, but also
> with some more useful code like the attached RSA_Angriff from the C'T
> magazine.
>
> My results are with:
>
> fpc -Sd -OG3rp3 -XX RSA_Angriff_D5.dpr
>
> 5266 ms
>
> with:
>
> fpc -Sd -XX RSA_Angriff_D5.dpr
>
> 4844 ms
>
> The unoptimized code is faster than the optimized code.
For me the version compiled with -OG3rp3 is the fastest (AthlonXP). Just
curious, what CPU do you use?
------------------------------
Message: 4
Date: Wed, 01 Jun 2005 16:47:57 +0200
From: Adrian Veith
Subject: Re: [fpc-pascal] Optimizer in 2.0
To:
Message-ID:
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Florian Klaempfl schrieb:
>Adrian Veith wrote:
>
>
>>It shows with useless code like simple nested for .. to loops, but also
>>with some more useful code like the attached RSA_Angriff from the C'T
>>magazine.
>>
>>My results are with:
>>
>>fpc -Sd -OG3rp3 -XX RSA_Angriff_D5.dpr
>>
>>5266 ms
>>
>>with:
>>
>>fpc -Sd -XX RSA_Angriff_D5.dpr
>>
>>4844 ms
>>
>>The unoptimized code is faster than the optimized code.
>>
>>
>
>For me the version compiled with -OG3rp3 is the fastest (AthlonXP). Just
>curious, what CPU do you use?
>
>
Intel Pentium M 730.
I will do the test on a Athlon XP as well. Maybe the picture changes.
------------------------------
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