Q-NOTE QN-7000HX Informations techniques télécharger pdf (Page 10)

Software Performance Optimization Methods

XAPP1206 v1.1 June 12, 2014 www.xilinx.com 10

All techniques for programing with NEON listed above are discussed in detail in the following

sections.

Software

Performance

Optimization

Methods

Optimization methods include:

• Using NEON Optimized Libraries

• Using Compiler Automatic Vectorization

• Using NEON Intrinsics

Using NEON Optimized Libraries

The ARM Cortex A9 processor has seen increasing utilization and is one of the most popular

platforms for embedded designs. The processor appears frequently in mobile, tablets, STB,

DTV, telecommunication, industrial control, and other applications. Given the widespread use

of the ARM Cortex A9 processor, a large user community has developed, providing a rich

ecosystem of NEON-optimized software libraries available to software algorithm designers.

Some of related projects are listed in Tabl e 4 .

Note that this is not an exhaustive list. Tabl e 4 contains only some popular projects because:

• Some projects are meaningful only for special purpose and lack common interest.

• More and more software projects are moving to NEON optimization. A good example is

OpenCV, which supports NEON in 2.3 (04/07/2011).

• The software community evolves quickly and new software projects are released

frequently.

Table 4: NEON Optimized Open Source Libraries

Project Name Project and Description

Project Ne10 ARM experts optimized vector, matrix, and DSP functions

OpenMAX DL sample

software library released

by ARM

ARMs sample implementation of OpenMAX DL (Development Layer)

software library. It can be used for a wide range of codec and data

computation algorithms

Google WebM Multimedia codec with NEON assembler optimization.

FFmpeg A complete, cross-platform solution to record, convert, and stream

audio and video.

x264 A free software library and application for encoding video streams into

the H.264/MPEG-4 AVC compression format.

Android Components, like Skia library, S32A_D565_Opaque, 5x faster using

NEON.

OpenCV Library aiming at real-time computer vision

BlueZ Bluetooth stack for Linux

Pixman A low-level software library for pixel manipulation. It supports image

compositing, trapezoid rasterization, etc.

Theorarm An Ogg Theora/Vorbis decoding library optimized for use on ARM

processors. It is based on Theora decoder, as supplied by xiph.org,

and the Tremolo library.

Eigen C++ template library for linear algebra, including matrices, vectors,

numerical solvers, etc.

FFTW C library for computing the discrete Fourier transform (DFT) in one or

more dimensions. It supports both real and complex data

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