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Using NEON Support E.1 Introduction RVCT provides intrinsics to generate NEON code for the Cortex-A8 processor in both ARM and Thumb state. The NEON intrinsics are defined in the header file arm_neon.h. The header file defines both the intrinsics and a set of vector types. There is no support for NEON intrinsics for architectures before ARMv7. When building for earlier architectures, or for ARMv7 architecture profiles that do not include NEON, the compiler treats NEON intrinsics as ordinary function calls. This results in an error at link time. E-2 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Using NEON Support E.2 Vector data types The following types are defined to represent vectors. NEON vector data types are named according to the following pattern: x_t For example, int16x4_t is a vector containing four lanes each containing a signed 16-bit integer. Table E-1 lists the vector data types. Table E-1 Vector data types int8x8_t int16x4_t int32x2_t int64x1_t uint8x8_t uint16x4_t uint32x2_t uint64x1_t float16x4_t float32x2_t poly8x8_t poly16x4_t int8x16_t int16x8_t int32x4_t int64x2_t uint8x16_t uint16x8_t uint32x4_t uint64x2_t float16x8_t float32x4_t poly8x16_t poly16x8_t Some intrinsics use an array of vector types of the form: xx_t These types are treated as ordinary C structures containing a single element named val. An example structure definition is: struct int16x4x2_t { int16x4_t val[2]; }; There are array types defined for array lengths between 2 and 4, with any of the vector types listed in Table E-1. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. E-3 ID101213 Non-Confidential,
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® RealView Compilation Tools Versi
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Product Status The information in t
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Contents RealView Compilation Tools
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Preface This preface introduces the
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Preface Appendix A Via File Syntax
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Preface Other publications The foll
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Chapter 1 Introduction This chapter
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Introduction 1.2 Source language mo
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Introduction 1.3 Language extension
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Introduction • Compiling a C sour
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Chapter 2 Compiler Command-line Opt
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Compiler Command-line Options 2.1.2
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Compiler Command-line Options Each
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Compiler Command-line Options Note
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Compiler Command-line Options Usage
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Chapter 3 Language Extensions This
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Language Extensions 3.1.2 #include_
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Language Extensions 3.5 Standard C+
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Language Extensions Example 3-2 Lin
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Page 441: Appendix E Using NEON Support This
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Using NEON Support E.3.31 Vector re
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