(TRO) Discarding the calling environment (call stack
frame) when the last thing a function or procedure
does is to call itself. This is important when a procedure
calls itself
recursively many times since, without tail
recursion optimisation, the environments of earlier
invocations would fill up the memory only to be discarded when
(if) the last call terminated.
Tail recursion optimisation is a special case of
last call optimisation but it allows the further optimisation that some
arguments may be passed in situ, possibly in registers. It
allows recursive functions to be compiled into iterative
loops.
See also
conversion to iteration,
tail recursion modulo cons.