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Compiler-specific Features Table 4-16 (continued) Intrinsic Summary description Returns Byte lanes Operands Side-effects __smlsldx Exchange halfwords of second operand, then 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, u64 None __smuad 2x16-bit signed multiplications, adding the products together. int32 int16x2, int16x2 Q bit __smusd 2x16-bit signed multiplications. Take difference of products, subtracting high halfword product from low halfword product. int32 int16x2, int16x2 None __smusdx 2x16-bit signed multiplications. Product of high halfword of first operand and low halfword of second operand is subtracted from product of low halfword of first operand and high halfword of second operand, and difference is added to third operand. int32 int16x2, int16x2 None __ssat16 2x16-bit signed saturation to a selected width int16x2 int16x2, /*constant* / unsigned int Q bit __ssax Exchange halfwords of second operand, subtract high halfwords and add low halfwords int16x2 int16x2, int16x2 APSR.GE bits __ssub16 2x16-bit signed subtraction int16x2 int16x2, int16x2 APSR.GE bits __ssub8 4x8-bit signed subtraction int8x4 int8x4 APSR.GE bits __smuadx Exchange halfwords of second operand, perform 2x16-bit signed multiplications, and add products together int32 int16x2, int16x2 Q bit __sxtab16 Two values at bit positions [23:16][7:0] are extracted from second operand, sign-extended to 16 bits, and added to first operand int16x2 int8x4, int16x2 None __sxtb16 Two values at bit positions [23:16][7:0] are extracted from the operand and sign-extended to 16 bits int16x2 int8x4 None __uadd16 2x16-bit unsigned addition uint16x2 uint16x2, uint16x2 APSR.GE bits 4-114 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 __uadd8 4x8-bit unsigned addition uint8x4 uint8x4, uint8x4 APSR.GE bits __uasx Exchange halfwords of second operand, add high halfwords and subtract low halfwords uint16x2 uint16x2, uint16x2 APSR.GE bits __uhadd16 2x16-bit unsigned addition, halving the results uint16x2 uint16x2, uint16x2 __uhadd8 4x8-bit unsigned addition, halving the results uint8x4 uint8x4, uint8x4 None None __uhasx Exchange halfwords of second operand, add high halfwords and subtract low halfwords, halving the results uint16x2 uint16x2, uint16x2 None __uhsax Exchange halfwords of second operand, subtract high halfwords and add low halfwords, halving the results uint16x2 uint16x2, uint16x2 None __uhsub16 2x16-bit unsigned subtraction, halving the results uint16x2 uint16x2, uint16x2 None __uhsub8 4x8-bit unsigned subtraction, halving the results uint8x4 uint8x4 None __uqadd16 2x16-bit unsigned addition, saturating to range 0 ≤ x ≤ 2 16 - 1 uint16x2 uint16x2, uint16x2 None __uqadd8 4x8-bit unsigned addition, saturating to range 0 ≤ x ≤ 2 8 - 1 uint8x4 uint8x4, uint8x4 None __uqasx Exchange halfwords of second operand, perform saturating unsigned addition on high halfwords and saturating unsigned subtraction on low halfwords uint16x2 uint16x2, uint16x2 None __uqsax Exchange halfwords of second operand, perform saturating unsigned subtraction on high halfwords and saturating unsigned addition on low halfwords uint16x2 uint16x2, uint16x2 None __uqsub16 2x16-bit unsigned subtraction, saturating to range 0 ≤ x ≤ 2 16 - 1 uint16x2 uint16x2, uint16x2 None __uqsub8 4x8-bit unsigned subtraction, saturating to range 0 ≤ x ≤ 2 8 - 1 uint8x4 uint8x4, uint8x4 None ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-115 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 Examp
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Compiler Command-line Options • a
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Compiler Command-line Options Synta
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Compiler Command-line Options Compi
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Compiler Command-line Options Selec
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Compiler Command-line Options • R
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Compiler Command-line Options Usage
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Compiler Command-line Options A num
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Compiler Command-line Options vfpv3
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Compiler Command-line Options #incl
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Compiler Command-line Options Error
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Compiler Command-line Options Error
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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 Restrictions Th
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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 int counter __a
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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 • You can use
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Language Extensions Errors The comp
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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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Compiler-specific Features The func
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Compiler-specific Features See also
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Compiler-specific Features __weak v
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Compiler-specific Features Examples
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Compiler-specific Features 4.3 Func
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Compiler-specific Features 4.3.2 __
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Compiler-specific Features 4.3.11 _
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Compiler-specific Features 4.4 Type
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Compiler-specific Features • Bit-
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Compiler-specific Features 4.5 Vari
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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 Se
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C and C++ Implementation Details Po
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C and C++ Implementation Details
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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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Appendix B Standard C Implementatio
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Standard C Implementation Definitio
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Appendix C Standard C++ Implementat
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Standard C++ Implementation Definit
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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 uint16x4_t vabd_
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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 // VLD4.16 {d0[0
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Using NEON Support // VST3.32 {d0,
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Using NEON Support // VST3.32 {d0[0
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Using NEON Support uint8x8_t vset_l
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Using NEON Support float32x2_t vmov
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Using NEON Support uint32x2_t vcvt_
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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 int8x16_t vqabsq
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Using NEON Support Bitwise and int8
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Using NEON Support E.3.31 Vector re
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