Most of the 61 tokens below do not appear in the solutions found
by OOPS in the experiments (Section 6). Still, we list all of
them for completeness' sake, and to provide at least one example
way of seeding OOPS with an initial set of behaviors. In the
following subsections, any instruction of the form inst ( )
expects its arguments on top of data stack ds, and replaces them
by its return values, adjusting dp accordingly -- the form
inst() is used for instructions without arguments. Illegal use
of any instruction will cause the currently considered program
prefix to halt. In particular, it is illegal to set variables
(such as stack pointers or instruction pointers) to values
outside their prewired given ranges, or to pop empty stacks, or
to divide by zero, or to call a nonexistent function, etc. Since
CPU time measurements on our PCs turned out to be unreliable, we
defined our own, rather realistic time scales. By definition,
most instructions listed below cost exactly 1 unit time step.
Some, however, consume