Target language in compiler design

Target language in compiler design
Compiler Construction

1. THE Torner Lanaua ae

= Fawn Biasity À with Ihe higéL machine aed its inslouction set

IS à poe seywisile for designing a quel code goatatos

Here, opt loque (asset code) fora Simple
Computes IS discussed which is vepwesentative of

many a tes machines

Al Simple Tasget Machine Model

Dus Al computer melels à reali mire”
with following opesahions :

Load value x in
LD vit er)
= Lod Operation ip 5 BE a)
* Du %

+ Stowe Operahons — gy Kr (She wies Y ey
x

, Computation Opexahms — ADO /suB/omn pw

+ Unconditional Timps — BR L (Branch fo lab L)

+ Grditonal Somps Bite 4, L (Bach à set

F Value of ¥

(8 ha au)

2. Pia

Machine Instuchons
LD Ry CE)
ED: Rie 2h (Rez 2)
SUB R1,R4,R2 (Ri Ri-R2)
ST x et (ask)

Dt ont necesa dy :
By o de ma Ur we all operaron
m winum
™ Number of operations

EPL RES (Rizy)

SUB RI, > (ae Rz)

Le UxeRı)
KeRı

A, Get an away value to avatiadle
Cap "Conse oa aah leed
fe 3024 EB pyle values, The machine inshuchen
ale fv boofi) >

s 121013

ere 34% Lo ari (aie i)
MUL R), RIB (Ris ates)
us Lo Rr, a(R) (R2= alas)

ST by RO (b= R2)

3. Store à Variable value inte ae
Mee ere

£ tomple.3
Poe ;
alj]=c

Machine Inshuchns _

LD Rie (Ri=c)
LD R2,j (R2=5)

MUL R2,R2,8 (R2= R28)

ST a(Rr2),RI (ales) = 21)

Craw pe À vey go L
Machine Instmehms
LD RI, x (Riz)
Lo Rz, y (R229)
SUB RI, RI, RD (RI =Ri-22)
ny
A AAA

iF mens that ey then
ge se)

4. Take Home Exes cases

O Generate code fos Follosng ves address atome

uma a awh b axe song whose elemects

ase U byte values.

D Finidelemdéque (1 tue od | Le que chine

+ cali] es Ligue
Je 56) re ah] %= afi)
afi - y 3=b[3) 32 a]
aller 22108) abJ=3

© Genet code fot the Allnsing Seponte Assuming hat

IS

Y a<y got Li
2=0
gr La

u: 221

O bronca cade fe m Alli Sean :

s=0
1.0

Lis if ion gl ur
S=s+i
isi+1

RT