Is it likely that several sections of a software system need to refer to each other?
Yes.
## Program to add two plus three
.text
.globl main
main:
ori $8,$0,0x2 # put two's comp. two into register 8
ori $9,$0,0x3 # put two's comp. three into register 9
addu $10,$8,$9 # add register 8 and 9, put result in 10
## End of file
All software consists of interconnected modules. A connection is made when one module refers to an address in another.
The next line:
ori $8,$0,0x2
translates into a 32-bit machine instruction.
This, upon execution, puts a 32-bit two's complement
positive two into register eight
(details later).
The next instruction (upon execution) puts a three into register nine. The final instruction (upon execution) adds register eight to register nine and puts the 32-bit result into register ten.
What algorithm do you suppose is used for the 32-bit addition?