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Method and device for generating fast Fourier transform code

A Fourier transform and generating device technology, applied in the computer field, can solve the problems of difficult optimization of FFT code, high development threshold, low production efficiency, etc.

Active Publication Date: 2020-02-04
XFUSION DIGITAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing solutions have the following deficiencies in the implementation of the FFT library: it is necessary to manually implement specific high-performance codes for different CPU architectures, the development threshold is high, the production efficiency is low, and different architectures or the same architecture but different specifications are required. The CPU implements different high-performance codes, and when the hardware platform changes, it is difficult to optimize the generated FFT code

Method used

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  • Method and device for generating fast Fourier transform code
  • Method and device for generating fast Fourier transform code
  • Method and device for generating fast Fourier transform code

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] For ease of understanding, the specific process of the embodiment of the present application is described below, please refer to image 3 , an embodiment of the fast Fourier transform code generation method in the embodiment of the present application includes:

[0089] 301. Acquire a data sequence that requires fast Fourier transform (FFT) and the length of the data sequence.

[0090] Wherein, the length N of the obtained data sequence may be determined in advance, and according to the length N, a data sequence containing N data that needs to be subjected to fast Fourier transform FFT can be obtained, and the data in the data sequence is usually a discrete digital signal.

[0091] 302. Determine the FFT decomposition mode of the data sequence according to the length of the data sequence, and obtain one or more stages of the butterfly network corresponding to the FFT decomposition mode, and each level corresponds to a butterfly basis.

[0092] The FFT decomposition met...

Embodiment 2

[0114] Based on the foregoing embodiments, this embodiment specifically introduces the butterfly code and the mixed templates and atomic templates included in the butterfly code. see Figure 4A , another embodiment of the fast Fourier transform code generation method in the embodiment of the present application includes:

[0115] 401. Acquire a data sequence that requires fast Fourier transform (FFT) and the length of the data sequence.

[0116] 402. Determine the FFT decomposition mode of the data sequence according to the length of the data sequence, and obtain one or more stages of the butterfly network corresponding to the FFT decomposition mode, and each level corresponds to a butterfly basis.

[0117] Steps 401 to 402 are similar to steps 301 to 302, and details are not repeated here.

[0118] 403. Determine the butterfly code that needs to be called in each level and the number of times the butterfly code is called according to the base of the butterfly corresponding ...

Embodiment 3

[0406] Based on the above examples, see Figure 6 , another embodiment of the fast Fourier transform code generation method in the embodiment of the present application includes:

[0407] 601. Acquire a data sequence requiring fast Fourier transform (FFT) and the length of the data sequence.

[0408] 602. Determine an FFT decomposition mode of the data sequence according to the length of the data sequence, and obtain one or more stages of a butterfly network corresponding to the FFT decomposition mode, and each level corresponds to a butterfly basis.

[0409] 603. Determine the butterfly code that needs to be called in each level and the number of times the butterfly code is called according to the base of the butterfly corresponding to each level.

[0410] 604. Generate the codes of each stage step by step according to the butterfly codes in each stage and the number of times the butterfly codes in each stage are called, so as to obtain FFT codes for performing fast Fourier ...

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Abstract

The invention discloses a method and device for generating a fast Fourier transform code, which are used for generating an FFT code and decomposing the FFT code into a plurality of atom templates so as to facilitate subsequent optimization of the atom templates and further improve the performance of the FFT code. The method comprises: acquiring a data sequence needing fast Fourier transform (FFT)and the length of the data sequence; determining an FFT decomposition mode of the data sequence according to the length of the data sequence, and obtaining one or more stages of the butterfly networkcorresponding to the FFT decomposition mode, wherein each stage corresponds to a butterfly base; determining a butterfly-shaped code needing to be called in each level and the calling times of the butterfly-shaped code in each level according to the butterfly-shaped base corresponding to each level; and according to the butterfly code in each level and the calling frequency of calling the butterfly code in each level, generating the code of each level step by step to obtain an FFT code for performing fast Fourier transform on the data sequence.

Description

technical field [0001] The present application relates to the field of computers, in particular to a method and device for generating fast Fourier transform codes. Background technique [0002] Fast Fourier transform (fast Fourier transform, FFT) is a fast algorithm for computing discrete Fourier transform (DFT) or its inverse operation. It is widely used in engineering, science and mathematics, such as signal Decomposition, digital filtering, image processing, etc. Through Fourier analysis, the source data will be transformed from the original domain (usually time or space) to the frequency domain representation or vice versa. In order to adapt to numerical calculations performed on a computer, it is necessary to discretize the Fourier transform, which is called the discrete Fourier transform DFT, and its mathematical expression is formula (1): [0003] [0004] Compared with the traditional algorithm, the FFT algorithm can reduce the algorithm complexity of calculatin...

Claims

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Application Information

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IPC IPC(8): G06F8/30G06F17/14
CPCG06F8/31G06F17/142
Inventor 李志豪齐霁张邵敏景玉超贾海鹏
Owner XFUSION DIGITAL TECH CO LTD
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