RealView Compilation Tools Compiler Reference Guide - ARM ...

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Compiler-specific Features 4.1 Keywords and operators This section describes the function keywords and operators supported by the ARM compiler armcc. Table 4-1 lists keywords that are ARM extensions to the C and C++ Standards. Standard C and Standard C++ keywords that do not have behavior or restrictions specific to the ARM compiler are not documented in the table. Table 4-1 Keyword extensions supported by the ARM compiler Keywords __align __int64 __svc __ALIGNOF__ __INTADDR__ __svc_indirect __asm __irq __svc_indirect_r7 __declspec __packed __value_in_regs __forceinline __pure __weak __global_reg __softfp __writeonly __inline __smc 4.1.1 __align The __align keyword instructs the compiler to align a variable on an n-byte boundary. __align is a storage class modifier. It does not affect the type of the function. Syntax __align(n) Where: n is the alignment boundary. n can take the values 1, 2, 4, or 8. The keyword __align comes immediately before the variable name. 4-2 Copyright © 2007, 2010 ARM Limited. All rights reserved. ARM DUI 0348A Non-Confidential
Compiler-specific Features Usage __align(n) is useful when the normal alignment of the variable being declared is less than n. Eight-byte alignment can give a significant performance advantage with VFP instructions. __align can be used in conjunction with extern and static. Restrictions Because __align is a storage class modifier, it cannot be used on: • types, including typedefs and structure definitions • function parameters. You can only overalign. That is, you can make a two-byte object four-byte aligned but you cannot align a four-byte object at 2 bytes. Example __align(8) char buffer[128]; /* buffer starts on eight-byte boundary */ See also • --min_array_alignment=opt on page 2-62 in the Compiler Reference Guide. 4.1.2 __alignof__ The __alignof__ keyword enables you to enquire about the alignment of a type or variable. Note This keyword is a GNU compiler extension that is supported by the ARM compiler. Syntax __alignof__(type) __alignof__(expr) Where: type expr is a type is an lvalue. ARM DUI 0348A Copyright © 2007, 2010 ARM Limited. All rights reserved. 4-3 Non-Confidential
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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 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 Note
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Compiler-specific Features Syntax #
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Compiler-specific Features #pragma
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Compiler-specific Features 4.6.20 #
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Compiler-specific Features If the i
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Compiler-specific Features 4.7 Inst
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Compiler-specific Features 4.7.3 __
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Compiler-specific Features Example
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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 4.7.33 _
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Compiler-specific Features Example
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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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Compiler-specific Features Table 4-
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Compiler-specific Features Table 4-
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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
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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 satur
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Using NEON Support Vector add high
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Using NEON Support Vector saturatin
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Using NEON Support uint64x1_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 int64x1_t vld1_l
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Using NEON Support // VST1.16 {d0[0
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Using NEON Support // VLD3.32 {d0,
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Using NEON Support // VLD3.16 {d0[]
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Using NEON Support // VLD3.32 {d0[0
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Using NEON Support void vst2_u64(__
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Using NEON Support void vst2q_lane_
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Using NEON Support float32_t vget_l
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Using NEON Support uint8x16_t vdupq
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Using NEON Support uint16x4_t vget_
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Using NEON Support E.3.25 Operation
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Using NEON Support int16x8_t vmulq_
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Using NEON Support Vector widening
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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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