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

In real MIPS, word starts at an address that is a multiple of 4
to get the proper byte address
multiply the index by 4,
Add offset to 4 x (2)
A + (4x2)
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Problem
Translate HLL statement g = h + A[2] to Assembly
g = h + A[2] means Add the 2 nd
the result in register g
array element to content of register h and store
Solution
Step1 Assign variables to registers
g h A 2
$S 1 $S 2 $S 3 $S 4
Step 2 Do simple translations
add $t 1 $S 4 $S 4 2+2
add $t 1 $t 1 $t 1 2(2+2)
add $t 1 $S 3 $t 1 Memory address of A + 8
lw $t 0 0($t 1 ) load word from memory address A + 8 to register t0
add $S 1 $t 0 $S 2 add the content of t0 to $s2