R1 R2 R3 a b c d t u v a b c d t a-b LD R1,a LD R2,b SUB R2,R1,R2 a t a,R1b c d R2 u =a-c LD R3,c SUB R1,R1,R3 u a b c,R3 d R2R1 v =t u ADD R3,R2,R1 t b R2 R1 R3 a d LD R2,d u a,d v R2 b cd,R2 R1R3 d v+u ADD R1,R3,R1 d R2 bc R1 R3 exit ST a,R2 ST d,R1 d a a,R2 b c d,R1 R3 CS308 Compiler Theory 8CS308 Compiler Theory 8