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Compiler-specific Features 4.4.4 __attribute__((transparent_union)) The transparent_union type attribute enables you to specify a transparent_union type, that is, a union data type qualified with __attribute__((transparent_union))__. When a function is defined with a parameter having transparent union type, a call to the function with an argument of any type in the union results in the initialization of a union object whose member has the type of the passed argument and whose value is set to the value of the passed argument. When a union data type is qualified with __attribute__((transparent_union)), the transparent union applies to all function parameters with that type. Note This type attribute is a GNU compiler extension that is supported by the ARM compiler. Note Individual function parameters might also be qualified with the corresponding __attribute__((transparent_union)) variable attribute. Example typedef union { int i; float f; } U __attribute__((transparent_union)); void foo(U u) { static int s; s += u.i; /* Use the 'int' field */ }void caller(void) { foo(1); /* u.i is set to 1 */ foo(1.0f); /* u.f is set to 1.0f */ } Mode Supported in GNU mode only. See also • __attribute__((transparent_union)) on page 4-52. 4-46 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features 4.5 Variable attributes The __attribute__ keyword enables you to specify special attributes of variables or structure fields, functions, and types. The keyword format is either: __attribute__ ((attribute1, attribute2, ...)) __attribute__ ((__attribute1__, __attribute2__, ...)) For example: void * Function_Attributes_malloc_0(int b) __attribute__ ((malloc)); static int b __attribute__ ((__unused__)); Table 4-3 on page 4-31 summarizes the available variable attributes. Table 4-5 Variable attributes supported by the compiler and their equivalents Variable attribute non-attribute equivalent __attribute__((alias)) - __attribute__((at(address))) - __attribute__((aligned)) - __attribute__((deprecated)) - __attribute__((noinline)) - __attribute__((packed)) - __attribute__((section(“name”))) - __attribute__((transparent_union)) - __attribute__((unused)) - __attribute__((used)) - __attribute__((weak)) __weak __attribute__((weakref("target"))) - __attribute__((visibility("visibility_type"))) - __attribute__((zeroinit)) - 4.5.1 __attribute__((alias)) This variable attribute enables you to specify multiple aliases for variables. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-47 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 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 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 3.3 C99 languag
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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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Compiler-specific Features 4.7.31 _
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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
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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 // VST3.32 {d0,
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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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