Re: [PATCH] [2.4] [2.5] [i386] Add support for GCC 3.1

[Luigi Genoni]

On Sun, 26 May 2002, Dave Jones wrote:

> On Sun, May 26, 2002 at 01:37:39AM +0200, J.A. Magallon wrote:
>  > Could you also split
>  > 	Pentium-Pro/Celeron/Pentium-II     CONFIG_M686
>  > into
>  >
>  > 	Pentium-Pro            CONFIG_M686
>  > 	Pentium-II/Celeron     CONFIG_MPENTIUMII
>  >
>  > Gcc-3.1 has also a -march=pentium2 specific target, that is not a synomym
>  > for any other.
>
> There are also a few extra Athlon targets iirc. athlon-xp and the like,
> which I'm not sure the purpose of. Some gcc know-all want to clue me in
> to what these offer over -march=athlon ?
>
I do not know about the gcc options, but Athlon XP/MP has sse instruction,
while tbird has not, so it could be relate to this.

>  > BTW, I think an option to enable -mmmx would also be useful. Nothing more,
>  > because afaik sse is only floating point.
>
> Another interesting recently-added option which may be worth
> benchmarking on modern CPUs is the prefetch-loops option.
> In a lot of cases, the kernel 'knows better' and is adding the
> prefetches itself, but it may be interesting to see what difference
> gcc can make here. (More interesting would be examining the output to
> see *where* gcc is putting the prefetches)
>
> Given the immaturity of all these options, I'd doubt they're that good
> an idea for 2.4. Getting them tested during 2.5 may prove to get any
> bugs shaken out in time for $compiler_of_the_choice for 2.6 though.
>
>     Dave
>
> --
> | Dave Jones.        http://www.codemonkey.org.uk
> | SuSE Labs
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