On Tue, Sep 22, 2015 at 07:26:46PM +0000, Jonathan Roelofs via cfe-commits wrote: > jroelofs added a comment. > > In http://reviews.llvm.org/D13051#250910, @EricWF wrote: > > > @jroelofs @dim, could we fallback to the __sync_* builtins on arm? > > > @dim would need armv4-flavored implementations of them in compiler-rt > (if that's what he's using)... the existing ones use instructions that > v4 doesn't have. Implementation-wise, they'd have to use > `__kuser_cmpxchg`. See: > https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt
That's a Linux-specific function/system call. That's not really helpful on FreeBSD. NetBSD provides restartable atomic sequences for this purpose. Joerg _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
