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Technologies

26 Datasheet, Volume 1 of 2

allows logic to remain active. The core clock can also restart more quickly under

Enhanced Intel SpeedStep Technology.

3.6 Intel

Advanced Vector Extensions (Intel

AVX)

Intel

Advanced Vector Extensions (Intel

AVX) is a new 256-bit vector SIMD

extension of Intel Architecture. The introduction of Intel AVX started with the Second

Generation Intel

Core™ processor family. Intel

AVX accelerates the trend of parallel

computation in general purpose applications like image, video and audio processing,

engineering applications (such as 3D modeling and analysis), scientific simulation, and

financial analysts.

Intel

AVX is a comprehensive ISA extension of the Intel

64 Architecture. The main

elements of Intel

AVX are:

• Support for wider vector data (up to 256-bit) for floating-point computation.

• Efficient instruction encoding scheme that supports three operand syntax and

headroom for future extensions.

• Flexibility in programming environment, ranging from branch handling to relaxed

memory alignment requirements .

• New data manipulation and arithmetic compute primitives, including broadcast,

permute, fused-multiply-add, and so on.

• Floating point bit depth conversion (Float 16)

• A group of four instructions that accelerate data conversion between 16-

bit floating point format to 32-bit and vice versa.

• This benefits image processing and graphical applications allowing

compression of data so less memory and bandwidth is required.

The key advantages of Intel

AVX are:

• Performance – Intel

AVX can accelerate application performance using data

parallelism and scalable hardware infrastructure across existing and new

application domains:

— 256-bit vector data sets can be processed up to twice the throughput of 128-bit

data sets

— Application performance can scale up with the number of hardware threads and

number of cores

— Application domain can scale out with advanced platform interconnect fabrics

• Power Efficiency – Intel

AVX is extremely power efficient. Incremental power is

insignificant when the instructions are unused or scarcely used. Combined with the

high performance that it can deliver, applications that lend themselves heavily to

using Intel

AVX can be much more energy efficient and realize a higher

performance-per-watt.

• Extensibility – Intel

AVX has built-in extensibility for the future vector

extensions:

— Operating System context management for vector-widths beyond 256 bits is

streamlined

— Efficient instruction encoding allows unlimited functional enhancements:

• Vector width support beyond 256 bits

• 256-bit Vector Integer processing