* [gentoo-alpha] ev6, ev67 or ev68?
@ 2005-09-19 18:38 Davide Cittaro
2005-09-19 19:35 ` kloeri
0 siblings, 1 reply; 2+ messages in thread
From: Davide Cittaro @ 2005-09-19 18:38 UTC (permalink / raw
To: gentoo-alpha
On a DS25, with ev68 CPU, I cannot set -mcpu=ev68 as CFLAGS, because
that option is not supported. Should I set it to ev6 or to ev67 then?
Which is the main difference in that?
If I set no -mcpu option I have problems since the g++ compiler seems
to work not properly.
Thanks
d
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* Re: [gentoo-alpha] ev6, ev67 or ev68?
2005-09-19 18:38 [gentoo-alpha] ev6, ev67 or ev68? Davide Cittaro
@ 2005-09-19 19:35 ` kloeri
0 siblings, 0 replies; 2+ messages in thread
From: kloeri @ 2005-09-19 19:35 UTC (permalink / raw
To: gentoo-alpha
On Mon, Sep 19, 2005 at 08:38:04PM +0200, Davide Cittaro wrote:
> On a DS25, with ev68 CPU, I cannot set -mcpu=ev68 as CFLAGS, because
> that option is not supported. Should I set it to ev6 or to ev67 then?
> Which is the main difference in that?
> If I set no -mcpu option I have problems since the g++ compiler seems
> to work not properly.
>
> Thanks
>
Using -mcpu=ev67 is fine. ev68 doesn't support any new instructions
afaik and scheduling is similar as well. If you decide to use -mcpu=ev6
you're going to miss the CIX instruction set and probably suffer
(somewhat) lower performance.
Regards,
Bryan Østergaard
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2005-09-19 18:38 [gentoo-alpha] ev6, ev67 or ev68? Davide Cittaro
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