Hej, all. I have been compiling on aarch64. Here I also use double-word CAS, via __atomic. As far as I know, all aarch64 systems offer double word CAS (i.e. 128-bit CAS). However, it seems GCC also here as on x64_86 now requires linking to libatomic. I thought this was x86_64 only, and existed there because of the initial Opertons lacking cmpxchg16b.
