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T2080NXN8MQB 产品设计参考手册 - NXP（恩智浦）
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Freescale Semiconductor
Application Note
© 2013 Freescale Semiconductor, Inc. All rights reserved.
This document explains how to download and use the
functions of the Mentor Embedded Performance Library for
Freescale AltiVec Technology (MEPL), which can be
downloaded from the Mentor Graphics website.
By using AltiVec technology, most functions execute much
faster than other libraries and standard C code. This can be
most helpful in time sensitive applications, such as in
aerospace and military fields. The acceleration created by
AltiVec technology when using the MEPL has been proven.
This guide demystifies the MEPL functions and the
requirements and data types for each function’s input
parameters. The guide describes how to initialize input
parameters, how to pass in the variables, and the steps
needed to create the desired output. There is a section on
signal processing functions and a section filled with example
code using several of the functions provided in this library.
For easy reference, the function topics in this guide appear in
the same order as in the Mentor Embedded Performance
Library Reference Manual.
Document Number: AN4786
Rev. 0, 08/2013
Contents
1. Downloading and linking . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Downloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2. Linking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Input parameters for common data types . . . . . . . . . . 2
3. Naming conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Signal processing functions . . . . . . . . . . . . . . . . . . . . 5
4.1. Create functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2. Destroy functions . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3. Compute functions . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4. Windowing functions . . . . . . . . . . . . . . . . . . . . . . 17
4.5. Miscellaneous functions . . . . . . . . . . . . . . . . . . . 18
5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1. Scalar multiply . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2. Multiply-Add . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3. Maximum, returned by index . . . . . . . . . . . . . . . 24
5.4. Root mean square . . . . . . . . . . . . . . . . . . . . . . . . 25
5.5. 1D discrete fourier transform on 2D matrix . . . . 26
5.6. Fill vector with random values . . . . . . . . . . . . . . 27
6. MEPL and AltiVec technology . . . . . . . . . . . . . . . . . 28
7. Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MEPL Quick Start Guide
Using the Mentor Embedded Performance Library for
Freescale AltiVec Technology (MEPL)
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