RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
See also
• __enable_irq.
4.7.15 __enable_fiq
This intrinsic enables FIQ interrupts.
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 4-71.
4.7.16 __enable_irq
This intrinsic enables IRQ interrupts.
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 4-72.
4.7.17 __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.
ARM DUI 0348A Copyright © 2007, 2010 ARM Limited. All rights reserved. 4-73
Non-Confidential