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Compiler-specific Features 4.7.46 ARMv6 SIMD intrinsics, summary descriptions, byte lanes, side-effects Table 4-16 Intrinsic Summary description Returns Byte lanes Operands Side-effects __qadd16 2 x 16-bit addition, saturated to range -2 15 ≤ x ≤ 2 15 - 1 int16x2 int16x2, int16x2 __qadd8 4 x 8-bit addition, saturated to range -2 7 ≤ x ≤ 2 7 - 1 int8x4 int8x4, int8x4 None None __qasx Exchange halfwords of second operand, add high halfwords, subtract low halfwords, saturating in each case int16x2 int16x2, int16x2 None __qsax Exchange halfwords of second operand, subtract high halfwords, add low halfwords, saturating in each case int16x2 int16x2, int16x2 None __qsub16 2 x 16-bit subtraction with saturation int16x2 int16x2, int16x2 __qsub8 4 x 8-bit subtraction with saturation int8x4 int8x4, int8x4 __sadd16 2 x 16-bit signed addition. int16x2 int16x2, int16x2 __sadd8 4 x 8-bit signed addition int8x4 int8x4, int8x4 None None APSR.GE bits APSR.GE bits __sasx Exchange halfwords of second operand, add high halfwords, subtract low halfwords int16x2 int16x2, int16x2 APSR.GE bits __sel Select each byte of the result from either the first operand or the second operand, according to the values of the GE bits. For each result byte, if the corresponding GE bit is set, the byte from the first operand is selected, otherwise the byte from the second operand is selected. Because of the way that int16x2 operations set two (duplicate) GE bits per value, the __sel intrinsic works equally well on (u)int16x2 and (u)int8x4 data. uint8x4 uint8x4, uint8x4 None __shadd16 2x16-bit signed addition, halving the results int16x2 int16x2, int16x2 __shadd8 4x8-bit signed addition, halving the results int8x4 int8x4, int8x4 None None 4-112 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features Table 4-16 (continued) Intrinsic Summary description Returns Byte lanes Operands Side-effects __shasx Exchange halfwords of the second operand, add high halfwords and subtract low halfwords, halving the results int16x2 int16x2, int16x2 None __shsax Exchange halfwords of the second operand, subtract high halfwords and add low halfwords, halving the results int16x2 int16x2, int16x2 None __shsub16 2x16-bit signed subtraction, halving the results int16x2 int16x2, int16x2 __shsub8 4x8-bit signed subtraction, halving the results int8x4 int8x4, int8x4 None None __smlad 2x16-bit multiplication, adding both results to third operand int32 int16x2, int16x2, int32 Q bit __smladx Exchange halfwords of the second operand, 2x16-bit multiplication, adding both results to third operand int16x2 int16x2, int16x2 Q bit __smlald 2x16-bit multiplication, adding both results to third operand. Overflow in addition is not detected. int64 int16x2, int16x2, int64 None __smlaldx Exchange halfwords of second operand, perform 2x16-bit multiplication, adding both results to third operand. Overflow in addition is not detected. int64 int16x2, int16x2, int64 None __smlsd 2x16-bit signed multiplications. Take difference of products, subtract high halfword product from low halfword product, add difference to third operand. int32 int16x2, int16x2, int32 Q bit __smlsdx Exchange halfwords of second operand, then 2x16-bit signed multiplications. Product difference is added to a third accumulate operand. int32 int16x2, int16x2, int32 Q bit __smlsld 2x16-bit signed multiplications. Take difference of products, subtracting high halfword product from low halfword product, and add difference to third operand. Overflow in addition is not detected. int64 int16x2, int16x2, int64 None ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-113 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 • -
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Compiler Command-line Options Restr
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Compiler Command-line Options Defau
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Compiler Command-line Options Synta
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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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Language Extensions int counter __a
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Language Extensions 3.6.12 Structur
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Language Extensions • You can use
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Chapter 4 Compiler-specific Feature
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Compiler-specific Features Usage __
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Compiler-specific Features Return v
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Compiler-specific Features Example
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Chapter 5 C and C++ Implementation
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C and C++ Implementation Details th
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C and C++ Implementation Details 5.
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C and C++ Implementation Details No
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C and C++ Implementation Details na
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C and C++ Implementation Details 5.
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Appendix A Via File Syntax This app
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Via File Syntax A.2 Syntax Via file
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Standard C Implementation Definitio
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Standard C++ Implementation Definit
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Appendix D C and C++ Compiler Imple
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C and C++ Compiler Implementation L
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C and C++ Compiler Implementation L
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Appendix E Using NEON Support This
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Using NEON Support E.2 Vector data
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Using NEON Support • Vector long
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Using NEON Support uint64x1_t vqadd
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Using NEON Support Vector multiply
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Using NEON Support int64x1_t vqsub_
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Using NEON Support uint32x2_t vcle_
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Using NEON Support Long pairwise ad
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Using NEON Support int16x8_t vqshlq
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Using NEON Support uint8x8_t vrshr_
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Using NEON Support Vector signed->u
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Using NEON Support uint8x16_t vld1q
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Using NEON Support int16x4_t lane);
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Using NEON Support // VST1.8 {d0},
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Using NEON Support uint64x1x2_t vld
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Using NEON Support float32x2x4_t vl
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Using NEON Support lane); // VLD2.8
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Using NEON Support // VMLA.I16 d0,
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Using NEON Support Vector long mult
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Using NEON Support Vector widening
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Using NEON Support Bitwise and int8
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