Question

Write a program to evaluate the arithmetic statement 𝑥 = −𝑏 + (𝑏 ∗ 𝑏 − 4 ∗ 𝑎 ∗ 𝑐)/ 𝐶 + 𝐻 i. Using a general register computer with 3 address constructions ii. Using a stack organized computer with zero address operation instructions. 

Answer 1

i)

MUL R1, b, b R1$\gets$ M[b]*M[b]

MUL R2, 4, a R2$\gets$ M[4]*M[a]

MUL R2, R2, c R2$\gets$ R2*c

SUB R1, R1, R2 R1$\gets$ R1-R2

SUB R1, R1, b R1$\gets$ R1-M[b]

ADD R3, C, H R3$\gets$ M[C]+M[H]

DIV X, R1, R3 X$\gets$ R1/R3

ii)

PUSH 4 TOS$\gets$ 4

PUSH a TOS$\gets$ a

PUSH c TOS$\gets$ c

MUL TOS$\gets$(4*a)

MUL TOS$\gets$(4*a*c)

PUSH b TOS$\gets$ b

MUL TOS$\gets$ (b*b)

SUB TOS$\gets$ ((b*b)-(4*a*c))

SUB TOS$\gets$(((b*b)-(4*a*c))-b)

PUSH TOS$\gets$ C

PUSH TOS$\gets$ H

ADD TOS$\gets$(C+H)

DIV TOS$\gets$ (((b*b)-(4*a*c))-b)/(C+H)

POP X M[X]$\gets$ TOS