Actually you need to clarify what the semantics of an 'out' parameter are for S and P registers. 'out' should indicate whether the value of the register (ie. the value of the pointer) may change.
For example, in :
inline op set(PMC, NUM) {
$1->vtable->set_number_native(interpreter, $1, $2);
goto NEXT();
}
the PMC pointer passed in $1 will not be changed by the call to set, so
depending on the language being compiled the PMC pointer may be cached across
this op.
--
Jason
