SPIM Example

Here is a SPIM example using la. Execute the program by pushing F10 for each machine instruction. Look in the display of registers and observe that $t0 gets the address of val2. It now can be used as a base register for loading $t1 and $t2 with two words from memory.

## addEm.asm
## program to add two integers
##
        .text
        .globl  main

main:
        la    $t0,val2     #  put a 32-bit address into $t0
        lw    $t1,0($t0)   #  load first value, 2
        lw    $t2,4($t0)   #  load second value, 3
        sll   $0,$0,0      #  load delay slot
        addu  $t1,$t1,$t2  #  calc. sum

        .data
val0:   .word   0 
val1:   .word   1 
val2:   .word   2 
val3:   .word   3 
val4:   .word   4 
val5:   .word   5