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Compiler-specific Features
See also
• REV, REV16, REVSH, and RBIT on page 4-65 in the Assembler Guide.
4.7.28 __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.
Inline optimization
If a function foo is inlined into a function bar then the value returned by
__return_address from within foo is the return address of bar.
Tail-call optimization
If a function foo is tail-called from a function bar then the value returned
by __return_address from within foo is the return address of bar.
See also
• Other builtin functions on page 4-197
• __current_pc on page 4-78
• __current_sp on page 4-78
• Legacy inline assembler that accesses sp, lr, or pc on page 7-27 in the Compiler
User Guide.
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