Arm’s 5-series line moves slowly. The Cortex A53 and A55 each served across multiple generations of 7-series companions, and both were 2-wide in-order cores running at low clocks. When your a…
Interesting deep dive on ARM’s little cores. On the comparison to AMD’s Bulldozer:
Bulldozer is an obvious comparison because it also shares substantial resources between core pairs. However, shared resources had little to do with Bulldozer’s performance problems. In fact, Bulldozer was most competitive in multithreaded applications where there could be contention for shared resources. Bulldozer issues came from having less per-thread reordering capacity and higher cache latency than Sandy Bridge in a market where single-thread performance was of paramount importance. Cortex A510 does not target the high performance market. If performance did matter A510 would be held back by its in-order execution scheme, not shared resources. Instead of performance, A510 targets low power and area. Sharing resources fits that goal perfectly.