RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Assembler labels
The __asm keyword can be used to specify an assembler label for a C
symbol. For example:
int count __asm__("count_v1"); // export count_v1, not count
See Assembler labels on page 3-21 for more information.
Named register variables
The __asm keyword can be used to declare a named register variable. For
example:
register int foo __asm("r0");
See Named register variables on page 4-101 for more information.
See also
• asm keyword on page 3-25.
4.1.5 __forceinline
The __forceinline keyword forces the compiler to compile a C or C++ function inline.
The semantics of __forceinline are exactly the same as those of the C++ inline
keyword. The compiler attempts to inline a function qualified as __forceinline,
regardless of its characteristics. However, the compiler does not inline a function if
doing so causes problems. For example, a recursive function is inlined into itself only
once.
__forceinline is a storage class qualifier. It does not affect the type of a function.
Note
This keyword has the function attribute equivalent __attribute__((always_inline)).
Example
__forceinline static int max(int x, in y)
{
return x > y x : y; // always inline if possible
}
See also
• --forceinline on page 2-39
• __attribute__((always_inline)) on page 4-30.
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