;; Homework 6 answers

;; Problem 1
         LD      R2,a          ;; There seems to be an assumption
         JSR     PUSH          ;; that R2 is used to pass value to POP
         LD      R2,b          ;; STACK has [[ A  B
         JSR     OpAdd         ;;           [[ (A+B)
         LD      R2,c
         JSR     PUSH          ;;           [[ (A+B)  C
         LD      R2,d
         JSR     PUSH          ;;           [[ (A+B)  C   D
         JSR     OpAdd         ;;           [[ (A+B)  (C+D)
         JSR     OpMult        ;;           [[ (A+B)*(C+D)
         LD      R2,e
         JSR     PUSH          ;;           [[ (A+B)*(C+D)  E
         JSR     OpAdd         ;;           [[ (A+B)*(C+D)+E
         JSR     POP           ;;           [[
         ST      R2,r          ;; Assume R2 receives the POPed value]

;; Problem 2
         LDR     R0,R5,#4      ;; R0 <- x
         LDR     R1,R5,#-3     ;; R1 <- y
         ADD     R0,R0,R1      ;; R0 <- x+y
         STR     R0,R5,#0      ;; z <- R0  or z <- x+y