[LLVMdev] llvm memory barrier as a builtin

[Andrew Lenharth]

On Tue, Sep 16, 2008 at 5:42 PM, Mon Ping Wang <wangmp at apple.com> wrote:
>
> I would like access to LLVM memory barrier instruction as a built-in
> from clang, which means that I need a name for it. In gcc, I see names
> like __builtin_ia32_mfence but those refers to X86 SSE instruction
> that we support.  I don't see a gcc name that has the same semantics
> as our barrier instruction.  For a name,  I was thinking of
> __builtin_memory_barrier or __builtin_llvm_memory_barrier.  Does
> anyone object of adding it as built-in or have a better idea for a name?

__sync_synchronize is the gcc builtin for a memory barrier.

Andrew