Mailinglist Archive: opensuse-factory (850 mails)

[Andreas Jaeger <aj@xxxxxxx>]

Marc Collin <collinm@xxxxxxxxxxxxxxxx> writes:

> Le mercredi 13 septembre 2006 11:04, Andreas Jaeger a écrit :
>> Marc Collin <collinm@xxxxxxxxxxxxxxxx> writes:
>> > i use suse 64bits since a couple of release and one thing i notice it's
>> > slower than the 32 bits and slower than other 64 bits distribution
>> > (fedora and mandrake)
>> >
>> > don't know if you use tuning option when you build...
>>
>> We do build with -O2.  Such a speed difference is interesting and I
>> would be interested in the cause,
>>
>>
>> Andreas
>
> minimum to be done: -march=x86-64

This is the default for x86-64 ;-)

> i think x86 64 bits have minimum sse2
>
> -mfpmath=sse2

This is written in the ABI, no need to add it.

> -msse2

Same here.

> -funroll-all-loops 

This might be slower in some cases.

> -fomit-frame-pointer 

This is part of the ABI, no need to do it ;-)

> -ffast-math

You will break applications this way.

Andreas
-- 
 Andreas Jaeger, aj@xxxxxxx, http://www.suse.de/~aj/
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