RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Syntax
long __builtin_expect(long int expr, long int c)
Where:
expr
c
is an integral expression
is a compile-time constant.
Return value
__builtin_expect returns the value of expr.
Example
if (__builtin_expect(i, 0))
{
foo(); // we do not expect foo to be called,
} // because we expect i to be zero
4.7.5 __builtin_frame_address
This builtin function returns the frame address of the current function. The frame
address is usually the address of the first word the function pushes on to the stack.
Note
This builtin function is a GNU compiler extension that is supported by the ARM
compiler.
Mode
Supported in GNU mode only.
Syntax
void *__builtin_frame_address(unsigned int val)
Where:
val
is an unsigned integer evaluating to zero.
Return value
__builtin_frame_address returns the address of the frame of the current function.
4-66 Copyright © 2007, 2010 ARM Limited. All rights reserved. ARM DUI 0348A
Non-Confidential