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Compiler-specific Features Return value The __clz intrinsic returns the number of leading zeros in val. See also • Other builtin functions on page 4-197 • CLZ on page 4-54 in the Assembler Guide. 4.7.5 __current_pc This intrinsic enables you to determine the current value of the program counter at the point in your program where the intrinsic is used. Syntax unsigned int __current_pc(void) Return value The __current_pc intrinsic returns the current value of the program counter at the point in the program where the intrinsic is used. See also • __current_sp • __return_address on page 4-95 • Legacy inline assembler that accesses sp, lr, or pc on page 7-27 in the Compiler User Guide. 4.7.6 __current_sp This intrinsic returns the value of the stack pointer at the current point in your program. Syntax unsigned int __current_sp(void) Return value The __current_sp intrinsic returns the current value of the stack pointer at the point in the program where the intrinsic is used. 4-78 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features See also • Other builtin functions on page 4-197 • __current_pc on page 4-78 • __return_address on page 4-95 • Legacy inline assembler that accesses sp, lr, or pc on page 7-27 in the Compiler User Guide. 4.7.7 __disable_fiq This intrinsic disables FIQ interrupts. Note Typically, this intrinsic disables FIQ interrupts by setting the F-bit in the CPSR. However, for v7-M it sets the fault mask register (FAULTMASK). FIQ interrupts are not supported in v6-M. Syntax int __disable_fiq(void); void __disable_fiq(void); Usage The function prototype to use for this intrinsic depends on the target architecture you are compiling for. For ARMv7 (--cpu=7), use void __disable_fiq(void);. For all other architectures, including ARMv7-A, ARMv7-R, and ARMv7-M, you can use int __disable_fiq(void); or void __disable_fiq(void);. Return value int __disable_fiq(void); returns the value the FIQ interrupt mask has in the PSR prior to the disabling of FIQ interrupts. Restrictions The difference in function prototypes between the generic ARMv7 architecture and the ARMv7 A, R, and M-profiles exists because the way that the previous FIQ state is returned differs between the M-profile and the A and R-profiles. This means that when you compile with --cpu=7, the compiler is unable to generate an instruction sequence that works on all ARMv7 processors, so you must use the void __disable_fiq(void); function prototype with --cpu=7. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-79 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 Usage
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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 3.5 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 Errors The comp
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Chapter 4 Compiler-specific Feature
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Compiler-specific Features Usage __
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Compiler-specific Features Return v
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Compiler-specific Features Example
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Compiler-specific Features __weak v
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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 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 uint8x8_t vset_l
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Using NEON Support // VMLA.I16 d0,
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