Answered: write in assembly language usinf LC3…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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write in assembly language usinf LC3 simulator

LC3 simulator to use: https://wchargin.com/lc3web/

Implement an if-else statement
a. An if-else statement will execute one out of two blocks of code
b. Your if-else statement should check if R0 = R1, then make R3 = 5, if R0 ≠ R1, then make R3 = -5
c. You can manually modify R0, R1, and R3, in the simulator (before running your program only). You do not
have to program values for these registers

Psuedo code:

.ORIG x3000
; Two's Complement R1 (two instructions: negate and add 1)
; Initialize R3 with #0
; Add R0 and R1; place result into R2 (are they equal? If they are, what value is in R2?)
; Branch if non-zero to ELSE (they are not equal in this case)
IF ; Place #5 in R3
; Branch to done
ELSE ; Place #-5 in R3
DONE ; Halt CPU
.END

Expert Solution

Step 1

Here's the LC3 assembly code for the if-else statement:

.ORIG x3000
; Negate R1
NOT R1, R1
ADD R1, R1, #1

; Initialize R3 with #0
LD R3, #0

; Add R0 and R1 and store the result in R2
ADD R2, R0, R1

; Check if R2 is zero (R0 = R1)
BRZ IF

; If R0 ≠ R1, place #-5 in R3
LD R3, #-5
BR DONE

IF ; Place #5 in R3
LD R3, #5

DONE ; Halt CPU
HALT
.END

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