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Anandtech had a good overview page of what 64-bit (and more generally, Armv8) does for performance: http://anandtech.com/show/7335/the-iphone-5s-review/4 http:
by nilsbunger 13y ago
Anandtech had a good overview page of what 64-bit (and more generally, Armv8) does for performance:
http://anandtech.com/show/7335/the-iphone-5s-review/4 http://anandtech.com/show/7335/the-iphone-5s-review/4
Basically, the new arch increased registers, increased register widths, and cleaned up some architectural warts in Arm that hurt performance.
The "4GB memory" issue is a red herring -- 64-bit is about making all the paths through the chip wider to process more per cycle.
- drill_sarge 13y agoIt reminds me of AMD Athlon64 period. Everyone claimed 64bit to be responsible for everything. In fact the majority of the performance came from the improvements over the k7 architecture (like integrated memory controller, hyper transport, better prediction, improved pipelines, cache etc.), new instruction sets and so on.