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Data Alignment in SEE、SSE2

Data

Alignment

数据对齐

Streaming

SIMD

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关于在SSE、SSE2代码优化过程中数据16位对齐方式的详细说明，包括如何对齐以及对齐的多种方式。

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AP-833 Data Alignment and Programming Issues for the Streaming SIMD Extensions

01/27/99

Data Alignment and Programming Issues for the

Streaming SIMD Extensions with the Intel® C/C++

Compiler

Version 1.1

01/99

Order Number: 243872-002

AP-833 Data Alignment and Programming Issues for the Streaming SIMD Extensions

01/27/99

Information in this document is provided in connection with Intel products. No license, express or

implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except

as provided in Intel’s Terms and Conditions of Sale for such products, Intel assumes no liability

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Current characterized errata are available on request.

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AP-833 Data Alignment and Programming Issues for the Streaming SIMD Extensions

01/27/99 iii

Table of Contents

1 Introduction......................................................................................................................................... 1

2 Data Alignment with the Intel® C/C++ Compiler.............................................................................. 1

3 Compatibility Issues and Resolutions With the Microsoft Visual C++ Compiler ............................. 3

3.1 Hybrid application builds with VC++ and the Intel C++ Compiler Plug-in .................................. 3

3.2 Problems with the hybrid build....................................................................................................... 3

3.3 Recommendations for the hybrid build........................................................................................... 5

4 Other Issues......................................................................................................................................... 5

4.1 Explicit Allocation of objects containing floating-point data......................................................... 5

4.2 Use of the ebx register in Inlined-assembly.................................................................................... 7

4.3 Using #pragma pack or -Zp with floating-point data...................................................................... 7

5 Summary ............................................................................................................................................. 7

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