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Compiler-specific Features 0x00000004: f3ef8000 .... MRS r0,APSR ; formerly CPSR 0x00000008: f00000080 .... AND r0,r0,#0x80 0x0000000c: b672 r. CPSID i 0x0000000e: 4770 pG BX lr In all cases, the __disable_irq intrinsic can only be executed in privileged modes, that is, in non user modes. In User mode this intrinsic does not change the interrupt flags in the CPSR. See also • __enable_irq. 4.7.9 __enable_fiq This intrinsic enables FIQ interrupts. Note Typically, this intrinsic enables FIQ interrupts by clearing the F-bit in the CPSR. However, for v7-M, it clears the fault mask register (FAULTMASK). FIQ interrupts are not supported in v6-M. Syntax void __enable_fiq(void) Restrictions The __enable_fiq intrinsic can only be executed in privileged modes, that is, in non user modes. In User mode this intrinsic does not change the interrupt flags in the CPSR. See also • __disable_fiq on page 4-79. 4.7.10 __enable_irq This intrinsic enables IRQ interrupts. Note Typically, this intrinsic enables IRQ interrupts by clearing the I-bit in the CPSR. However, for Cortex M-profile processors, it clears the exception mask register (PRIMASK). 4-82 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features Syntax void __enable_irq(void) Restrictions The __enable_irq intrinsic can only be executed in privileged modes, that is, in non user modes. In User mode this intrinsic does not change the interrupt flags in the CPSR. See also • __disable_irq on page 4-80. 4.7.11 __fabs This intrinsic inserts a VABS instruction or an equivalent code sequence into the instruction stream generated by the compiler. It enables you to obtain the absolute value of a double-precision floating-point value from within your C or C++ code. Note The __fabs intrinsic is an analogue of the standard C library function fabs. It differs from the standard library function in that a call to __fabs is guaranteed to be compiled into a single, inline, machine instruction on an ARM architecture-based processor equipped with a VFP coprocessor. Syntax double __fabs(double val) Where: val is a double-precision floating-point value. Return value The __fabs intrinsic returns the absolute value of val as a double. See also • __fabsf on page 4-84 • VABS, VNEG, and VSQRT on page 5-95 in the Assembler Guide. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-83 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 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 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 3.3 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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Language Extensions 3.7 GNU languag
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Language Extensions 3.7.5 Character
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Language Extensions • You can use
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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 The func
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Compiler-specific Features See also
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Compiler-specific Features __weak v
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Compiler-specific Features When a c
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Compiler-specific Features Examples
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Compiler-specific Features Usage If
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Compiler-specific Features 4.7.58 _
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Compiler-specific Features 4.8 VFP
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Compiler-specific Features Table 4-
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Compiler-specific Features 4.10 GNU
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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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