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Re: changing the SPARC default


Alexey Starovoytov <alexey.starovoytov@sun.com> writes:

> Hi,
>
> The default architecture for GCC SPARC is V7.
> What do gcc sparc developers think about changing it to V8PLUS?
>
> Few things to consider:
>  - v7 is legacy
>     . used in old Sun's sun4c systems
>     . 32-bit only
>     . no integer mul/div insns
>
>  - first 64-bit SPARC was made in 1995
>     . I guess it would be a valid assumption that there are
>       not so many 32-bit SPARC chips left
>
>  - there is a big performance gap between v7 and v8plus
>     . I guess no need to explain the importance of 64-bit registers
>
>
> 1st choice (the best):
>  - change the default for all sparc platforms
>
> 2nd:
>  - change the default for Solaris 7+ and linux
>
> 3rd (100% safe):
>  - change the default for Solaris 10+
>
> Also 64-bit Linux doesn't have to mean 64-bit (v9) gcc compiler,
> so at the same time it would be good to change it to v8plus as well.
>
> All that changes can be done by easily tweaking gcc/config.gcc
> by adding with_cpu=v9
>
> Alexey.

 Debian has been running with V8PLUS as the default since the sarge release
cycles started.  I.e. years.


-- 
Thanks,
Jim

http://www.csclub.uwaterloo.ca/~ja2morri/
http://phython.blogspot.com
http://open.nit.ca/wiki/?page=jim


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