RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Note
The compiler introduces REV automatically when it recognizes certain expressions.
Syntax
unsigned int __rev(unsigned int val)
Where:
val
is an unsigned int.
Return value
The __rev intrinsic returns the value obtained from val by reversing its byte order.
See also
• REV, REV16, REVSH, and RBIT on page 4-64 in the Assembler Guide.
4.7.31 __return_address
This intrinsic returns the return address of the current function.
Syntax
unsigned int __return_address(void)
Return value
The __return_address intrinsic returns the value of the link register that is used in
returning from the current function.
Restrictions
The __return_address intrinsic does not affect the ability of the compiler to perform
optimizations such as inlining, tail-calling, and code sharing. Where optimizations are
made, the value returned by __return_address reflects the optimizations performed:
No optimization
When no optimizations are performed, the value returned by
__return_address from within a function foo is the return address of foo.
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