RealView Compilation Tools Compiler Reference Guide - ARM ...

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Compiler-specific Features void Variable_Attributes_transparent_union_0(transparent_union_t aUnion __attribute__ ((transparent_union))) { static int aStatic; aStatic +=aUnion.myint; } void Variable_Attributes_transparent_union_1() { int aLocal =0; float bLocal =0; Variable_Attributes_transparent_union_0(aLocal); Variable_Attributes_transparent_union_0(bLocal); } See also • __attribute__((transparent_union)) on page 4-38. 4.5.8 __attribute__((unused)) Normally, the compiler warns if a variable is declared but is never referenced. This attribute informs the compiler that you expect a variable to be unused and tells it not issue a warning if it is not used. Note This variable attribute is a GNU compiler extension that is supported by the ARM compiler. Example void Variable_Attributes_unused_0() { static int aStatic =0; int aUnused __attribute__ ((unused)); int bUnused; aStatic++; } In this example, the compiler warns that bUnused is declared but never referenced, but does not warn about aUnused. Note The GNU compiler does not give any warning. 4-46 Copyright © 2007, 2010 ARM Limited. All rights reserved. ARM DUI 0348A Non-Confidential
Compiler-specific Features 4.5.9 __attribute__((used)) This variable attribute informs the compiler that a variable is to be retained in the object, even if it is unreferenced. Variables marked as used are emitted to a single section, in the order they are declared. You can specify the section into which variables are placed using __attribute__((section)). Note This variable attribute is a GNU compiler extension that is supported by the ARM compiler. Note Functions might also be marked as used using the corresponding function attribute __attribute__((used)). Usage You can use __attributte__((used)) to build tables in the object. Example static int lose_this = 1; static int keep_this = 2 __attribute__((used)); // retained in object file static int keep_this_too = 3 __attribute__((used)); // retained in object file See also • __attribute__((section)) on page 4-44 • __attribute__((used)) on page 4-35. 4.5.10 __attribute__((weak)) The declaration of a weak variable is permitted, and acts in a similar way to __weak. • in GNU mode: extern int Variable_Attributes_weak_1 __attribute__((weak)); • the equivalent in non-GNU mode is: __weak int Variable_Attributes_weak_compare; ARM DUI 0348A Copyright © 2007, 2010 ARM Limited. All rights reserved. 4-47 Non-Confidential
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® RealView Compilation Tools Versi
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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 • #
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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 Examp
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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 If --
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Compiler Command-line Options • I
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Compiler Command-line Options N #if
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Compiler Command-line Options 1 Res
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Compiler Command-line Options Restr
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Compiler Command-line Options • #
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Compiler Command-line Options Synta
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Compiler Command-line Options Restr
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Compiler Command-line Options • S
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Compiler Command-line Options --no_
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Compiler Command-line Options --apc
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Compiler Command-line Options Selec
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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 Example void co
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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 3.6.4 Assembler
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Language Extensions 3.6.12 Structur
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Language Extensions 3.7 GNU languag
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Page 147 and 148: Chapter 4 Compiler-specific Feature
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Page 209 and 210: Compiler-specific Features 4.7 Inst
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Page 217 and 218: Compiler-specific Features Return v
Page 219 and 220: Compiler-specific Features See also
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Compiler-specific Features unsigned
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Compiler-specific Features int32_t
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Compiler-specific Features See also
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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 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 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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