raptor/notes/linker_inline.txt

Linker inlining is enabled by default for both UREL and UDEB builds
when building with RVCT4.0 onwards

Linker inlining means that the linker is able to replace branch instructions
to smaller functions, by inlining the code of the small function where the
call is made. Branching is an expensive operation, and this feature allows
the linker to avoid branching. The constraint to that is that target 
function should fit within the 4bytes of the branch instruction, which is
why linker inlining shouldn’t cause any code size increase, since it’s 
simply replacing a 4byte branch instruction with the 4byte inlined function.