On Fri, Feb 21, 2020 at 9:38 AM J.W. Jagersma <jwjagersma@xxxxxxxxx> wrote: > > Besides the performance loss, i386 doesn't have cmpxchg which means > > atomic support will be a problem. Otherwise, it will probably work. > > I did notice that using i386, my program doesn't link at -O0 due to > undefined references to __atomic_* builtins. Somehow it works at -O1 > and above. It seems the only atomic operations I use are compiled to > 'lock add/sub' instructions. Atomics are probably inline expanded with optimization. There is a libatomic library you can link with, -latomic, that should implement all atomics that aren't inline expanded. But I'm not sure exactly how this works with a i386 toolchain given that cmpxchg is missing. Jim
