Answered: M is a 16-bit memory address, and X, Y,…

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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Question

Compare 0-, 1-, 2-, and 3-address machines by writing programs to compute
X = (A x B + C) / (D − E × B)
for each of the four machines. The instructions available for use are as follows:

M is a 16-bit memory address, and X, Y, and Z are either 16-bit addresses or 4-bit registers. The
0-address machine uses a stack, the 1-address machine uses an accumulator, and the other two have
16 registers and instructions operating on all combinations of memory locations and registers. SUB X,
Y subtracts Y from X and SUB X, Y, Z subtracts Z from Y and puts the result in X. With 8-bit opcodes
and instruction lengths that are multiples of 4 bits, how many bits does each machine need to compute
X?

O Addess
I Address
2 Address
MOV (X- Y)
ADD (X = X+Y)
SUB (X-X-Y)
MUL (X= X•Y)
(X- X/Y)
3 Address
MOV (X- Y)
ADD (X- Y+Z)
SUB (X- Y-Z)
MUL (X- Y+Z)
(X- YIZ)
PUSH M
LOAD M
POP M
STORE M
ADD
ADO M
SUBM
MUL M
SUB
MUL
DIV
DIV
DIV
DIV M

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