Absolute Value

You can build a real rats-nest of code with assembly language. Avoid this by implementing the structures of a high level language. Draw a flowchart of the program or rough it out in C or Java before coding. Put comments in the assembly source program before you add code to show how the code and the flowchart correspond.

The flowchart at right shows a program that calculates the absolute value of the integer at symbolic address "A". The program follows that logic.

Assume that "A" starts at address 0x10000000. The lui instruction points the base register $10 at that address.

## absVal.asm
##
## Calculate the absolute value of A

    .text
    .globl  main

main: 
# Get A
      lui   $10,0x1000     #  Initialize the
                           #  base register
                           
      lw    $8,($10)    #  Load A
      
         $0,$0,0        #  load delay slot

# Is A Negative?

# Store -A

done:   

    .data
A:  .word   -1

Answer:

Absolute Value

QUESTION 14: