simd_ext.pdf (application/pdf Object)
http://download.intel.com/technology/itj/Q21999/PDF/simd_ext.pdf
Fencing
In order to allow efficient software-controlled coherency,
a light-weight fence (SFENCE) instruction was also
included in the new extension; this instruction ensures
that all stores that precede the fence are observed on the
front-side bus before any subsequent stores are
completed. SFENCE is targeted for uses such as writing
commands from the processor to the graphics accelerator
or to ensure observability between a producer and
consumer where communication of data uses stores with
a WC memory-type semantic.
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