"Most" ends up being surprising(ex: ARM has a fairly weak memory model). I've seen a lot of code with aligned access and extensive use of "volatile" in MSVC/x86 explode once it was ported to other architectures.
Older ARM CPUs did not have a well defined memory model, but all 64-bit ARM CPUs have a well defined behavior, which includes the atomicity of any loads and stores whose size is up to 64-bit and which are aligned, i.e. the same as Intel/AMD CPUs.
The current ARM memory model is more relaxed regarding the ordering of loads and stores, but not regarding the atomicity of single loads and stores.
