Re:Will It Optimize?
by psykotic on Friday September 16, 2011 @04:11PM
(#3006112)
> Intel lists their throughput at 3 instead of 0.5!
Agner Fog lists ADC/SBB on Atom as having latency 2 and throughput 1/2. I guess Intel could have made them run with ADD/SUB-level performance in cases where there are no intra-pair dependencies on the carry/borrow flag, but the extra interlocks for handling that were probably not worth the cost.
Agner Fog lists ADC/SBB on Atom as having latency 2 and throughput 1/2. I guess Intel could have made them run with ADD/SUB-level performance in cases where there are no intra-pair dependencies on the carry/borrow flag, but the extra interlocks for handling that were probably not worth the cost.