Re: [gentoo-dev] auto selection of optimal gcc architecture settings

[Padraig Brady]

Mark Gordon wrote:
> On Mon, 28 Apr 2003 10:18:54 +0100
> Padraig Brady <padraig.brady@××××××.com> wrote:
>
>
>>Eric Ball wrote:
>>
>>>On Sat, 26 Apr 2003 12:57 am, Padraig Brady wrote:
>>>
>>>
>>>>Hi,
>>>>
>>>>I've been testing http://www.pixelbeat.org/scripts/gcccpuopt
>>>>over the last while with good results. Essentially it's
>>>>a Linux specific script that only helps on x86 at present
>>>>but can be updated to other architectures easily.
>>>>
>>>>It would be beneficial IMHO for gentoo to run it at
>>>>installation time and update /etc/make.conf appropriately?
>>>>
>>>>thanks,
>>>>Pádraig.
>>>
>>>It seems nifty.
>>>I'd recommend you submit it in Bugzilla at bugs.gentoo.org or in the
>>>
>>>gentoo-dev list as the powers-that-be might not read this list.
>
>
> It needs extending even for the x86 compatible world.
>
> markg@brenda markg $ ./gcccpuopt
>  -march=pentium2 -mmmx
> markg@brenda markg $ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineTMx86
> cpu family      : 6
> model           : 4
> model name      : Transmeta(tm) Crusoe(tm) Processor TM5600
>
> As far as I'm aware the Crusoe emulates a Pentium, not a PII (I've not
> seen anything definitive stating otherwise).

Nah, cpu family = 6 is quite definitive.
This is from /usr/src/linux-2.4/arch/i386/Makefile
ifdef CONFIG_MCRUSOE
CFLAGS += -march=i686
endif

> Any other strange processors out there that might have problems?

the only exception is a gcc bug where is assumes 686 has cmov,
and this is handled explicitly.

Pádraig.


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