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Compiler-specific Features Note This variable attribute is a GNU compiler extension that is supported by the ARM compiler. Example int Variable_Attributes_aligned_0 __attribute__ ((aligned (16))); /* aligned on 16 byte boundary */ short Variable_Attributes_aligned_1[3] __attribute__ ((aligned)); /* aligns on 4 byte boundary for ARM */ See also • __align on page 4-2. 4.5.4 __attribute__((deprecated)) The deprecated variable attribute enables the declaration of a deprecated variable without any warnings or errors being issued by the compiler. However, any access to a deprecated variable creates a warning but still compiles. The warning gives the location where the variable is used and the location where it is defined. This helps you to determine why a particular definition is deprecated. Note This variable attribute is a GNU compiler extension that is supported by the ARM compiler. Example extern int Variable_Attributes_deprecated_0 __attribute__ ((deprecated)); extern int Variable_Attributes_deprecated_1 __attribute__ ((deprecated)); void Variable_Attributes_deprecated_2() { Variable_Attributes_deprecated_0=1; Variable_Attributes_deprecated_1=2; } Compiling this example generates two warning messages. 4-50 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features 4.5.5 __attribute__((noinline)) constant variable attribute The noinline variable attribute prevents the compiler from making any use of a constant data value for optimization purposes, without affecting its placement in the object. This feature can be used for patchable constants, that is, data that is later patched to a different value. It is an error to try to use such constants in a context where a constant value is required. For example, an array dimension. Example __attribute__((noinline)) const int m = 1; See also • #pragma inline, #pragma no_inline on page 4-66 • __attribute__((noinline)) on page 4-34 • __declspec(noinline) on page 4-27. 4.5.6 __attribute__((packed)) The packed variable attribute specifies that a variable or structure field has the smallest possible alignment. That is, one byte for a variable, and one bit for a field, unless you specify a larger value with the aligned attribute. Note This variable attribute is a GNU compiler extension that is supported by the ARM compiler. Example struct { char a; int b __attribute__ ((packed)); } Variable_Attributes_packed_0; See also • #pragma pack(n) on page 4-68 • Packed structures on page 5-10 • The __packed qualifier and unaligned data access on page 5-27 in the Compiler User Guide ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-51 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 • I
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Compiler Command-line Options See a
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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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Compiler-specific Features See also
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Compiler-specific Features ptr poin
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Compiler-specific Features 4.7.39 _
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Compiler-specific Features 4.7.44 A
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Compiler-specific Features Table 4-
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Compiler-specific Features 4.7.47 A
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Compiler-specific Features 4.7.100
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Compiler-specific Features } int32_
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Compiler-specific Features 4.8 VFP
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Compiler-specific Features 4.10 GNU
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Compiler-specific Features __builti
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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 st
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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 Bitwise Select N
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Using NEON Support E.3.31 Vector re
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