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Compiler-specific Features 4.3.13 __attribute__((section("name"))) The section function attribute enables you to place code in different sections of the image. Note This function attribute is a GNU compiler extension that is supported by the ARM compiler. Example In the following example, Function_Attributes_section_0 is placed into the RO section new_section rather than .text. void Function_Attributes_section_0 (void) __attribute__ ((section ("new_section"))); void Function_Attributes_section_0 (void) { static int aStatic =0; aStatic++; } In the following example, section function attribute overrides the #pragma arm section setting. #pragma arm section code="foo" int f2() { return 1; } // into the 'foo' area __attribute__ ((section ("bar"))) int f3() { return 1; } // into the 'bar' area int f4() { return 1; } // into the 'foo' area #pragma arm section See also • #pragma arm section [section_sort_list] on page 4-59. 4-38 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features 4.3.14 __attribute__((unused)) The unused function attribute prevents the compiler from generating warnings if the function is not referenced. This does not change the behavior of the unused function removal process. Note This function attribute is a GNU compiler extension that is supported by the ARM compiler. Example static int Function_Attributes_unused_0(int b) __attribute__ ((unused)); 4.3.15 __attribute__((used)) This function attribute informs the compiler that a static function is to be retained in the object file, even if it is unreferenced. Static functions marked as used are emitted to a single section, in the order they are declared. You can specify the section functions are placed in using __attribute__((section)). Note This function attribute is a GNU compiler extension that is supported by the ARM compiler. Note Static variables can also be marked as used using __attribute__((used)). Example static int lose_this(int); static int keep_this(int) __attribute__((used)); // retained in object file static int keep_this_too(int) __attribute__((used)); // retained in object file See also • __attribute__((section("name"))) on page 4-38. • __attribute__((used)) on page 4-54. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-39 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 Synta
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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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Compiler-specific Features Syntax v
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Compiler-specific Features Restrict
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Compiler-specific Features 4.7.24 _
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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 4.7.44 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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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 Bitwise Select N
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Using NEON Support E.3.31 Vector re
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