Re: Stupid question

[Gene Heskett]

On Tuesday 23 November 2004 07:08, Nix wrote:
>On 23 Nov 2004, Gene Heskett yowled:
>> On Monday 22 November 2004 09:32, P@xxxxxxxxxxxxxx wrote:
>>>Gene Heskett wrote:
>>>> Greetings;
>>>>
>>>> Silly Q of the day probably, but what do I set in a Makefile for
>>>> the -march=option for building on a 233 mhz Pentium 2?
>>>
>>>http://www.pixelbeat.org/scripts/gcccpuopt
>>
>> Thanks very much.  Obviously someone else needed to scratch this
>> itch too.  This should produce the correct results when running on
>> the target machine.  Here, it produces this:
>> [root@coyote CIO-DIO96]# sh ../gcccpuopt
>>  -march=athlon-xp -mfpmath=sse -msse -mmmx -m3dnow
>
>... which is peculiar, as -mmmx -msse is redundant, as is -mmmx
> -m3dnow, and all three of those flags are the end are implied by
> -march=athlon-xp anyway.
>
Humm, as I see it, the choices presented in a make xconfig do not 
allow the choice of the athlon-xp, just the athlon.  Are there any 
worthwhile optimizations the added '-xp' would bring into play?  
Making it enough faster to make that choice a worthwhile choice?

Said another way, what file would I edit after the .config has been 
saved in order to put that into effect for the subsequent build?

>(-mfpmath=sse *is* useful on non-64-bit platforms, though.)

Oh?  As that stuff is pretty invisible during a make today, how would 
one go about determining if thats in effect on this machine?

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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by Gene Heskett are:
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