On Sun, Dec 23, 2012 at 01:26:21PM +0000, Matt Thomas wrote:
> Module Name: src
> Committed By: matt
> Date: Sun Dec 23 13:26:21 UTC 2012
>
> Modified Files:
> src/sys/arch/arm/arm: cpu_in_cksum_fold.S
>
> Log Message:
> Conditional execution still takes one cycle per skipped instruction.
> branch to unlikely cases instead of conditionally skipping them.
Or more for 'ldm' and 'stm' - esp. I think on strongarm!
Conditional execution might also be a full pipeline stall, rather
than a branch which is likely (hopefully) to be predicted correctly.
David
--
David Laight: da...@l8s.co.uk
