[LLVMdev] Here need your help

[Eli Friedman]

On Tue, Oct 23, 2012 at 12:38 AM, liu chao jun <amiko212 at 126.com> wrote:
>  Hi all
>
>     when i compiled  llvm-3.0 with icedtea1.11.4 together,A memory_barrier
> error happened ,And now I write to all of you for the following questions
> need your help and suggestion :
>     1, Is any function which can replace the "make_function" in the
> following function,
>     2 , Or is there any  different paramters in make_function with the
> similar action with the following one
>     3 ,Is there a function similar with "nop" which can return a address in
> LLVM or Shark ,
>
>  Value* SharkBuilder::memory_barrier() {
>       return make_function(
> #if defined(ARM)
>             (address) 0xffff0fa0, // __kernel_dmb
>  #else
>                "llvm.memory.barrier",
>  #endif // ARM
>      "11111", "v");
>  }

In newer versions of LLVM, llvm.memory.barrier has been replaced by
new atomic instructions; you're probably interested in the "fence"
instruction in particular.  See
http://llvm.org/docs/LangRef.html#i_fence

-Eli