| SLIDE Int{-this many-} Int{-down by this much-}
-- To do with the heap
| ALLOC_AP Int -- make an AP with this many payload words
| ALLOC_PAP Int Int -- make a PAP with this arity / payload words
| SLIDE Int{-this many-} Int{-down by this much-}
-- To do with the heap
| ALLOC_AP Int -- make an AP with this many payload words
| ALLOC_PAP Int Int -- make a PAP with this arity / payload words