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Compiler-specific Features 4.1.8 __int64 The __int64 keyword is a synonym for the keyword sequence long long. __int64 is accepted even when using --strict. See also • --strict, --no_strict on page 2-119 • long long on page 3-8. 4.1.9 __INTADDR__ The __INTADDR__ operation treats the enclosed expression as a constant expression, and converts it to an integer constant. Note This is used in the offsetof macro. Syntax __INTADDR(expr) Where: expr is an integral constant expression. Return value __INTADDR__(expr) returns an integer constant equivalent to expr. See also • Restrictions on embedded assembly on page 7-19 in the Compiler User Guide. 4.1.10 __irq The __irq keyword enables a C or C++ function to be used as an interrupt routine. __irq is a function qualifier. It affects the type of the function. Restrictions All corrupted registers except floating-point registers are preserved, not only those that are normally preserved under the AAPCS. The default AAPCS mode must be used. 4-10 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features The function exits by setting the program counter to lr-4 and the CPSR to the value in SPSR. No arguments or return values can be used with __irq functions. Note When compiling for a Thumb-only processor, the code is compiled to Thumb code because interrupt handlers are entered in Thumb state. Otherwise, even when compiling for Thumb using the --thumb option or #pragma thumb, any functions specified as __irq are compiled for ARM. See also • --thumb on page 2-122 • #pragma thumb on page 4-73 • Chapter 6 Handling Processor Exceptions in the Developer Guide. 4.1.11 __packed The __packed qualifier sets the alignment of any valid type to 1. This means that: • there is no padding inserted to align the packed object • objects of packed type are read or written using unaligned accesses. The __packed qualifier applies to all members of a structure or union when it is declared using __packed. There is no padding between members, or at the end of the structure. All substructures of a packed structure must be declared using __packed. Integral subfields of an unpacked structure can be packed individually. Usage The __packed qualifier is useful to map a structure to an external data structure, or for accessing unaligned data, but it is generally not useful to save data size because of the relatively high cost of access. Only packing fields in a structure that requires packing can reduce the number of unaligned accesses. Note On ARM processors that do not support unaligned access in hardware, for example, pre-ARMv6, access to unaligned data can be costly in terms of code size and execution speed. Data accesses through packed structures must be minimized to avoid increase in code size and performance loss. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-11 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 Usage
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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
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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 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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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 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 uint8x16_t vld1q
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Using NEON Support uint64x1x2_t vld
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Using NEON Support lane); // VLD2.8
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