ORC/orc (OR with Complement)

OR with Complement X-form
orc RA,RS,RB (Rc=0)
orc. RA,RS,RB (Rc=1)
RA <=  (RS) | ¬(RB)
The contents of register RS are ORed with the complement
of the contents of register RB and the result is
placed into register RA.
Special Registers Altered:
CR0 (if Rc=1)