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CARM Introduction Compiling Programs 
Language Extensions 
Keywords Pointers Function Declarations __arm: ARM Function __fiq: Fast Interrupt __inline: Function in-lining __irq: Interrupt __ram: RAM Function __swi: Software Interrupt __task: Task Function __thumb: Thumb Function Inline Assembly Register Use Use in Macro Definitions Special Instructions LDAV Instruction STAV Instruction LDAA Instruction Absolute Variable Location Variable Alignment Preprocessor Advanced Programming Error Messages Library Reference AppendixKeywords
To facilitate many of the features of the ARM devices, the CARM Compiler adds a number of new keywords to the scope of the C language:
- __arm uses the ARM native instruction set for function code.
- __asm inserts in-line assembly code.
- __at locates functions or variables to absolute memory addresses.
- __fiq defines a fast interrupt function.
- __inline defines an inline function.
- __irq defines a standard interrupt function.
- __ram relocates a function to RAM for execution.
- __packed specifies byte alignment for a single data object.
- __swi defines a software interrupt function.
- __task defines a task function for a Real-Time Operating System.
- __thumb uses the Thumb instruction set for function code.
You may disable these extensions using the NOEXTEND directive. Refer to Compiling Programs for more information.
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