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Intel Smart Memory Access
Intel Smart Memory Access improves system
performance by optimizing the use of the
available data bandwidth from the memory
subsystem and hiding the latency of memory
accesses.
Intel Smart Memory Access includes an
important new capability called memory
disambiguation, which increases the efficiency
of out-of-order processing by providing the
execution cores with the built-in intelligence to
speculatively load data for instructions that are
about to execute before all previous store
instructions are executed.
The adjacent diagram is an example of
memory disambiguation. The circled numbers
on the arrows indicate chronological execution
order and the arrow on the far left shows program order. As you can see, Load 2 cannot be moved forward since it has to
wait until Store 1 is executed to ensure variable Y has its correct value. However, Intel
’s memory disambiguation predictor
can recognize that Load 4 is not dependent on the other instructions shown and can be executed first without having to wait
for either Store 3 or Store 1 to execute. By executing Load 4 several cycles earlier, the CPU now has the data required for
executing any instructions that need the value of X, thus reducing memory latency and delivering a higher degree of
instruction-level parallelism.
Intel Advanced Digital Media Boost
Intel Advanced Digital Media Boost is a feature that significantly improves performance when executing Streaming SIMD
Extension (SSE/SSE2/SSE3) instructions.
This accelerates a broad range of applications including video, speech and image, photo processing, encryption, and
financial, engineering, and scientific applications. Intel Advanced Digital Media Boost feature enables these 128-bit
instructions to be completely executed at a throughput rate of one per clock cycle, effectively doubling (on a per clock basis)
the speed of execution for these instructions as compared to previous generations.
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