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Language Extensions • In operations on pointers, a pointer to void is always implicitly converted to another type if necessary. Also, a null pointer constant is always implicitly converted to a null pointer of the right type if necessary. In ISO C, some operators permit these, and others do not. • Pointers to different function types can be assigned or compared for equality (==) or inequality (!=) without an explicit type cast. A warning or error is issued. This extension is prohibited in C++ mode. • A pointer to void can be implicitly converted to, or from, a pointer to a function type. • In an initializer, a pointer constant value can be cast to an integral type if the integral type is big enough to contain it. • A non lvalue array expression is converted to a pointer to the first element of the array when it is subscripted or similarly used. 3.4.3 Block scope function declarations Two extensions to block scope function declarations are supported: • a block-scope function declaration also declares the function name at file scope • a block-scope function declaration can have static storage class, thereby causing the resulting declaration to have internal linkage by default. Example void f1(void) { static void g(void); /* static function declared in local scope */ /* use of static keyword is illegal in strict ISO C */ } void f2(void) { g(); /* uses previous local declaration */ } static void g(int i) { } /* error - conflicts with previous declaration of g */ 3-12 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Language Extensions 3.4.4 Dollar signs in identifiers Dollar ($) signs are permitted in identifiers. Note When compiling with the --strict option, you can use the --dollar command-line option to permit dollar signs in identifiers. Example #define DOLLAR$ See also • --dollar, --no_dollar on page 2-51 • --strict, --no_strict on page 2-119. 3.4.5 Top-level declarations A C input file can contain no top-level declarations. Errors A remark is issued if a C input file contains no top-level declarations. Note Remarks are not displayed by default. To see remark messages, use the compiler option --remarks. See also • --remarks on page 2-111. 3.4.6 Benign redeclarations Benign redeclarations of typedef names are permitted. That is, a typedef name can be redeclared in the same scope as the same type. Example typedef int INT;typedef int INT; /* redeclaration */ ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 3-13 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 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-specific Features 4.3 Func
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Compiler-specific Features 4.3.2 __
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Compiler-specific Features Note Thi
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Compiler-specific Features 4.3.11 _
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Compiler-specific Features See also
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Compiler-specific Features 4.4 Type
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Compiler-specific Features • Bit-
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Compiler-specific Features 4.5 Vari
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Compiler-specific Features In parti
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Compiler-specific Features 4.5.5 __
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Compiler-specific Features Note You
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Compiler-specific Features Default
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Compiler-specific Features • Chap
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Compiler-specific Features Where: t
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Compiler-specific Features This pra
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Compiler-specific Features • __at
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Compiler-specific Features Example
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Compiler-specific Features Note Bot
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Compiler-specific Features 4.7 Inst
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Compiler-specific Features opcode2
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Compiler-specific Features Example
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Compiler-specific Features Syntax v
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Compiler-specific Features Where: p
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Compiler-specific Features Errors T
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Compiler-specific Features Syntax v
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Compiler-specific Features Restrict
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Compiler-specific Features Errors T
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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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Compiler-specific Features • __uh
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Compiler-specific Features • Para
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Compiler-specific Features • Para
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Compiler-specific Features 4.7.100
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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 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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