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Why didn't ARM call it ARM64? It's hard to believe it didn't cross their minds and decided AArch64 is the better name, so it could be another reason.


The "ARM123" naming scheme was used to refer to specific ARM cores prior to the "Cortex" naming scheme. While "ARM64" isn't ambiguous in and of itself, it's troublingly close to ARM60, the first ARM CPU with a 32-bit address space.




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