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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 Limited. All rights reserved. ARM DUI 0348A Non-Confidential
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 float32x2_t poly8x8_t poly16x4_t int8x16_t int16x8_t int32x4_t int64x2_t uint8x16_t uint16x8_t uint32x4_t uint64x2_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 above. ARM DUI 0348A Copyright © 2007, 2010 ARM Limited. All rights reserved. E-3 Non-Confidential
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® RealView Compilation Tools Versi
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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 • ARM datasheet or techni
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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 Defau
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Compiler Command-line Options Note
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Compiler Command-line Options Table
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Compiler Command-line Options int m
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Compiler Command-line Options See a
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Compiler Command-line Options • -
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Compiler Command-line Options • T
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Compiler Command-line Options Where
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Compiler Command-line Options Mode
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Compiler Command-line Options • #
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Compiler Command-line Options Synta
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Compiler Command-line Options When
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Compiler Command-line Options A num
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Compiler Command-line Options softv
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Compiler Command-line Options 1 Res
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Compiler Command-line Options Restr
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Compiler Command-line Options • #
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Compiler Command-line Options Synta
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Compiler Command-line Options --no_
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Compiler Command-line Options --apc
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Compiler Command-line Options Selec
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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 3.2 C99 languag
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Language Extensions 3.3 C99 languag
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Language Extensions Example void co
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Language Extensions static int y =
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Language Extensions 3.4.4 Dollar si
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Language Extensions 3.5 Standard C+
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Language Extensions Example 3-2 Lin
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Language Extensions 3.6 Standard C
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Language Extensions 3.6.4 Assembler
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Language Extensions 3.6.12 Structur
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Language Extensions 3.7 GNU languag
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Language Extensions 3.7.5 Character
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Language Extensions 3.7.10 Inline T
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Language Extensions Example int bar
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Chapter 4 Compiler-specific Feature
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Compiler-specific Features Usage __
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Compiler-specific Features Example
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Compiler-specific Features 4.1.6 __
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Compiler-specific Features 4.1.11 _
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Compiler-specific Features short x;
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Compiler-specific Features Where: s
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Compiler-specific Features typedef
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Compiler-specific Features • 0-25
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Compiler-specific Features Usage Fu
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Compiler-specific Features }; __dec
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Compiler-specific Features 4.3 Func
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Compiler-specific Features The comp
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Compiler-specific Features Note Thi
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Compiler-specific Features In the f
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Compiler-specific Features 4.4 Type
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Compiler-specific Features void cal
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Compiler-specific Features replaced
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Compiler-specific Features 4.6 Prag
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Compiler-specific Features • Temp
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Compiler-specific Features Syntax #
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Compiler-specific Features #pragma
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Compiler-specific Features • __at
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Compiler-specific Features 4.6.20 #
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Compiler-specific Features 4.7 Inst
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Compiler-specific Features Where: c
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Compiler-specific Features Return v
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Compiler-specific Features See also
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Compiler-specific Features Syntax v
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Compiler-specific Features Where: v
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Compiler-specific Features Note The
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Compiler-specific Features • BKPT
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Compiler-specific Features unsigned
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Compiler-specific Features int32_t
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Compiler-specific Features 4.8 Comp
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Page 275 and 276: Appendix A Via File Syntax This app
Page 277 and 278: Via File Syntax A.2 Syntax Via file
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Page 301: Appendix E Using NEON Support This
Page 305 and 306: Using NEON Support • Vector satur
Page 307 and 308: Using NEON Support Vector add high
Page 309 and 310: Using NEON Support Vector saturatin
Page 311 and 312: Using NEON Support uint64x1_t vqsub
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Using NEON Support Absolute: Vd[i]
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Using NEON Support uint8x8_t vmvn_u
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Using NEON Support int16x8_t vornq_
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Using NEON Support uint32x4x2_t vuz
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