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Compiler-specific Features BB bb __attribute__((at(0x20000004))); void foo(void) { bb.i = 1; } For peripherals that are width-sensitive, byte, halfword, and word stores or loads to the alias space are generated for char, short, and int types of bitfields of bit-banded structs respectively. In Example 4-7 bit-banded access is generated for bb.i. Example 4-7 Bitfield bit-band access typedef struct { char i: 1; int j: 2; int k: 3; } BB __attribute__((bitband)); BB bb __attribute__((at(0x20000004))); void foo() { bb.i = 1; } If you do not use __attribute__((at())) to place the bit-banded variable in the bit-band region then you must relocate it using another method. You can do this by either using an appropriate scatter-loading description file or by using the --rw_base linker command-line option. See the Linker Reference Guide for more information. Restrictions The following restrictions apply: • This type attribute can only be used with struct. Any union type or other aggregate type with a union as a member cannot be bit-banded. • Members of structs cannot be bit-banded individually. • Bit-banded accesses are generated only for single-bit bitfields. 4-44 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features • Bit-banded accesses are not generated for const objects, pointers, and local objects. See also • __attribute__((at(address))) on page 4-48 • Bit-banding on page 4-16 in the Compiler User Guide • Technical Reference Manual for your processor. 4.4.2 __attribute__((aligned)) The aligned type attribute specifies a minimum alignment for the type. Note This type attribute is a GNU compiler extension that is supported by the ARM compiler. 4.4.3 __attribute((packed)) The packed type attribute specifies that a type must have the smallest possible alignment. Note This type attribute is a GNU compiler extension that is supported by the ARM compiler. Errors The compiler generates a warning message if you use this attribute in a typedef. See also • __packed on page 4-11 • #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 • __packed structures versus individually __packed fields on page 5-28 in the Compiler User Guide. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-45 ID101213 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 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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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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Compiler-specific Features See also
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Compiler-specific Features 4.7.31 _
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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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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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