- (let ((aux-instr (vector-ref core (+ ptr num))))
- (instr-set-A-num! aux-instr (- 1 (instr-A-num aux-instr)))
- (+ num (instr-A-num aux-instr))))
+ (let ((aux-instr (vector-ref core (addr+ ptr num))))
+ (instr-set-A-num! aux-instr (addr+ -1 (instr-A-num aux-instr)))
+ (addr+ num (instr-A-num aux-instr))))