Lecture Notes for Computer Architecture II - St. Cloud State University

High Level Language Statements Assembly Language Translation
HLL MIPS Assembly
MIPS Machine
In general the translation process includes
1. assigning variables in high level language statement into registers
2. Translation into assembly
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Simple arithmetic instructions - manipulate data in registers
Problem
Translate the a = b + c; High Level Language (HLL) statement into assembly language
Solution
compiler
1. a = b + c add a,b,c
Problem
Translate HLL statement A = b+c+d+e; to AL
Solution
add a,b,c
add a,a,d
add a,a,e
Problem
HLL d = a-e;
compiler
d = a-e sub d, a, e
Problem
Translate HLL f = (g+h) – (i+j) into MIPS assembly language
Solution
Step1 Assign variables to registers
f g h i j
$S 0 $S 1 $S 2 $S 3 $S 4
Step 2 Do simple translations
add t 0 , $S1, $S2
add t 1 , $S3, $S4
sub $S0, t 0 , t 1