<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
three-address	B-Application
code	I-Application
(	O
often	O
abbreviated	O
to	O
TAC	O
or	O
3AC	O
)	O
is	O
an	O
intermediate	O
code	O
used	O
by	O
optimizing	B-Application
compilers	I-Application
to	O
aid	O
in	O
the	O
implementation	O
of	O
code-improving	B-Application
transformations	I-Application
.	O
</s>
<s>
Since	O
three-address	B-Application
code	I-Application
is	O
used	O
as	O
an	O
intermediate	O
language	O
within	O
compilers	O
,	O
the	O
operands	O
will	O
most	O
likely	O
not	O
be	O
concrete	O
memory	O
addresses	O
or	O
processor	B-General_Concept
registers	I-General_Concept
,	O
but	O
rather	O
symbolic	O
addresses	O
that	O
will	O
be	O
translated	O
into	O
actual	O
addresses	O
during	O
register	O
allocation	O
.	O
</s>
<s>
It	O
is	O
also	O
not	O
uncommon	O
that	O
operand	O
names	O
are	O
numbered	O
sequentially	O
since	O
three-address	B-Application
code	I-Application
is	O
typically	O
generated	O
by	O
the	O
compiler	O
.	O
</s>
<s>
A	O
refinement	O
of	O
three-address	B-Application
code	I-Application
is	O
A-normal	B-Application
form	I-Application
(	O
ANF	O
)	O
.	O
</s>
<s>
In	O
three-address	B-Application
code	I-Application
,	O
this	O
would	O
be	O
broken	O
down	O
into	O
several	O
separate	O
instructions	O
.	O
</s>
<s>
These	O
instructions	O
translate	O
more	O
easily	O
to	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
Three-address	B-Application
code	I-Application
may	O
have	O
conditional	O
and	O
unconditional	O
jumps	O
and	O
methods	O
of	O
accessing	O
memory	O
.	O
</s>
<s>
In	O
this	O
way	O
,	O
three-address	B-Application
code	I-Application
may	O
be	O
useful	O
in	O
control-flow	O
analysis	O
.	O
</s>
