:: deftheorem defines GCD-Algorithm SCPINVAR:def 4 :
GCD-Algorithm = (((GBP := 0) ';' ((GBP,3) := (GBP,1))) ';' (SubFrom (GBP,3,GBP,2))) ';' (while<>0 (GBP,3,(((if>0 (GBP,3,(Load (SubFrom (GBP,1,GBP,2))),(Load (SubFrom (GBP,2,GBP,1))))) ';' ((GBP,3) := (GBP,1))) ';' (SubFrom (GBP,3,GBP,2)))));