2012 ARM發表ARMv8架構, 開始支援64bit 定址 (Cortex-A50家族)

Current cores from ARM Holdings support a 32-bit address space and 32-bit arithmetic; 
the ARMv8-A architecture, announced in October 2011,^[6] adds support for a 64-bit address space and 64-bit arithmetic

http://www.techbang.com/posts/12224-arm-of-the-64-bit-revolution-resolution