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