Question

Write an assembly language programming for the following

expressions using IAS computer instruction set and interpret to the flow of LAS computer. Make necessary assumption
i) A= (B-C)/D
ii) A= B/(C*D)​

Answer 1

Answer:

IAS Computer Instruction Set:

i) A = (B-C)/D

MOV R1,B ; Move contents of B to Register R1

SUB R1,C ; Subtract contents of C from R1

DIVIDE R1,D ; Divide contents of R1 by D

MOV A,R1 ; Move the result to A

LAS Computer Instruction Set:

LOAD R1,B ; Load contents of B to Register R1

SUB R1,C ; Subtract contents of C from R1

DIV R1,D ; Divide contents of R1 by D

STORE A,R1 ; Store the result to A

ii) A= B/(C*D)

MOV R1,B ;Move contents of B to Register R1

MOV R2,C ;Move contents of C to Register R2

MUL R2,D ;Multiply contents of R2 by D

DIVIDE R1,R2 ;Divide contents of R1 by R2

MOV A,R1 ;Move the result to A

LAS Computer Instruction Set:

LOAD R1,B ;Load contents of B to Register R1

LOAD R2,C ;Load contents of C to Register R2

MUL R2,D ;Multiply contents of R2 by D

DIV R1,R2 ;Divide contents of R1 by R2

STORE A,R1 ;Store the result to A