Jérôme M. Berger wrote:
> Empty loop:       3387ms    (was     0ms)
> Kiss64 (int):     7348ms    (was  6623ms)
> Kiss64 (dbl):    16045ms    (was  5003ms)
> Alvo (floor):    22209ms    (was 21539ms)
> Alvo (cast):     16258ms    (was 14608ms)
> Alvo (tmp+cast): 15054ms    (was 14664ms)
> Isaac:           10701ms    (was 10540ms)
> 

	I just ran the tests on another computer with a Core2 duo and the 
results are rather interesting:

	With the same binary as above:
Empty loop:       2173ms
Kiss64 (int):     7541ms
Kiss64 (dbl):    15844ms
Alvo (floor):    24778ms
Alvo (cast):      8469ms
Alvo (tmp+cast):  8473ms
Isaac:            7810ms

	Notice how the last three are much faster?

	Recompiled with g++ 4.4 and -O3:
Empty loop:       1154ms
Kiss64 (int):     5944ms
Kiss64 (dbl):    12590ms
Alvo (floor):    22433ms
Alvo (cast):      7636ms
Alvo (tmp+cast):  8076ms
Isaac:            6428ms

	Slight improvement (10-20%) all around.

	Recompiled with g++ 4.4 and -O3 -ftree-vectorize:
Empty loop:       1085ms
Kiss64 (int):     5504ms
Kiss64 (dbl):    11663ms
Alvo (floor):    22039ms
Alvo (cast):      7730ms
Alvo (tmp+cast):  7730ms
Isaac:            5918ms

	Again, slight improvement all around except for Alvo. I'm not sure 
why Kiss64 gets improved though...

	And here is the system info:
 > uname -a
Linux rover 2.6.29-ARCH #1 SMP PREEMPT Sat May 9 14:09:36 CEST 2009 
x86_64 Intel(R) Core(TM)2 Duo CPU T5670 @ 1.80GHz GenuineIntel GNU/Linux

  > gcc --version
gcc (GCC) 4.4.0
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There 
is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.

		Jerome
-- 
mailto:jeb### [at] freefr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr

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