egcs optimization for K6 processor

[Joel N. Squire]

Mike Coleman <mkc@sky.net> writes:

> > Is someone working on optimalisations for the K6 ?
> 
> The document you pointed at certainly looks like it would help for K6-specific
> optimizations.  I may try my hand at this if it looks like it hasn't already
> been done.  (I don't know the egcs code--so don't hold your breath for the
> results.)
> 
> I'd be interested in hearing about it if anyone else is working on this...
> 
> --Mike

The PCG group has code to optimize for the K6 in their patches. I
played with these and a couple of other modifications as suggested in
AMD's whitepaper, but the over all speed effects aren't usually very
large (+/- 5%). Disabling the 0-cycle FXCH code provided a noticable
improvement in some FP codes, however.

-- 

 Joel Squire <squire@colorado.edu>	CCAR Systems Administrator
 Ph (303) 492-1308 FAX (303) 492-2825 	University of Colorado, Boulder