A safe function does not push anything on the s7 stack, and treats the
arg list
passed to it as immutable and temporary (that is, it just grabs the
arguments from
the list). A few s7_* functions are unsafe, and that makes anything
that calls
them also unsafe. If the optimizer knows a function is safe, it can use
prebuilt
lists to pass the arguments (saving in the GC), and can combine it in
various
ways with other stuff. If the safe function knows its return and
argument
types, there is another level of optimization that can call it without
setting up an arglist or "unboxing" values, basically a direct call in
C.
s7.html has a brief example (see s7_set_i_i_function), and there are
many
examples in s7.c and clm2xen.c in Snd.
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