If supplied, this is a lambda-expression to be compiled.
, this is the symbol that is to receive the compiled function as its global function definition.
A single value is returned, being the
symbol if supplied, or when
the compiled function definition itself. Such compiled-function objects are not printable (but see disassemble) other than as
#<compiled function for SYMBOL>
calls the compiler to translate a lambda expression into a code vector containing an equivalent sequence of host specific machine code. A compiled function typically runs between 10 and 100 times faster. It is generally worth compiling the most frequently called Lisp functions in a large application during the development phase. The compiler detects a large number of programming errors, and the resulting code runs sufficiently faster to justify the compilation time, even during development.
(defun fn (...) ...) ; interpreted definition for fn
See declare for a list of the declarations that alter the behavior of the compiler.