Register Association Table
26/43
reserved
reserved
free
a
free
b
0
1
2
3
4
5
contents
reg.
Structure of a RAT:
Contents
:
…
…
reserved
free
var
i
•
reversed
for some operation
system purposes
•
var
i
=
name of variable
•
Every use of a register updates RAT.
•
RAT indicates the current contents of each
register