On Fri, 2006-03-03 at 16:45 +0000, David Howells wrote:
> David Howells <[email protected]> wrote:
>
> > WRITE mtx
> > --> implies SFENCE
>
> Actually, I'm not sure this is true. The AMD64 Instruction Manual's writeup of
> SFENCE implies that writes can be reordered, which sort of contradicts what
> the AMD64 System Programming Manual says.
there are 2 or 3 special instructions which do "non temporal
stores" (movntq and movnit and maybe one more). sfense is designed for
those.
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