Apple, LLVM Developers Figure Out Their 64-Bit ARM Approach Written by Michael Larabel in LLVM on 14 April 2014 at 09:33 PM EDT. 2 Comments Two weeks ago Apple open-sourced their 64-bit ARM back-end to LLVM. Following last week's EuroLLVM meeting, they have decided that the community's existing open-source 64-bit ARM back-end will likely be merged into Apple's now-public back-end. At the "EuroLLVM