True, but outside of memory ordering, x86_64 and ARM64 are probably among the easiest to port between. Endianness, alignment and type sizes are the same, for ex

True, but outside of memory ordering, x86_64 and ARM64 are probably among the easiest to port between. Endianness, alignment and type sizes are the same, for example. Plus a lot of code already has been ported to both.