Re: stmw/lmw [Was: CVS commit: src/sys/arch/powerpc/powerpc]

[Jason Thorpe <thorpej%wasabisystems.com@localhost>]

On Sunday, August 3, 2003, at 06:31  PM, Simon Burge wrote:

> Does this have any measurable impact on trap response and context 
> switch
> times (simply because of more instruction fetches)?  It's also larger
> code, so we have greater I$ pollution...

It might be worth #ifdef'ing the use of those insns, using 
__OPTIMIZE_SIZE__ to use the load/store-multiple insns on non-PPC64.

It's worth noting, however, that individual load/store insns are 
probably going to be faster than the load/store-multiple on most modern 
PPCs (like, probably everything since the 601).

        -- Jason R. Thorpe <thorpej%wasabisystems.com@localhost>