On Thu, May 26, 2011 at 04:29:50PM +0200, Richard Guenther wrote:
> To make it a compiler memory barrier you have to "expand" the
> builtin already in the frontend and present the middle-end with
> __asm__ ("...." : : : "memory"). That will serve as a compiler
> memory barrier also covering local non-address taken storage
> (global and practically most of address-taken local storage
> is covered by a builtin function call already).
But then, what is the point of the builtin when
__asm__ __volatile__ ("rep; nop" : : : "memory");
does all of that already and has been supported for years...
Jakub
