<s>
The	O
IA-32	B-Device
Execution	I-Device
Layer	I-Device
(	O
IA-32	B-Device
EL	I-Device
)	O
is	O
a	O
software	B-Application
emulator	I-Application
in	O
the	O
form	O
of	O
a	O
software	B-Application
driver	I-Application
that	O
improves	O
performance	O
of	O
32-bit	O
applications	O
running	O
on	O
64-bit	B-Device
Intel	O
Itanium-based	O
systems	O
,	O
particularly	O
those	O
running	O
Linux	B-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
(	O
it	O
is	O
included	O
in	O
Windows	B-Application
Server	I-Application
2003	I-Application
SP1	O
and	O
later	O
and	O
in	O
most	O
Linux	B-Application
distributions	I-Application
for	O
Itanium	B-General_Concept
)	O
.	O
</s>
<s>
The	O
IA-32	B-Device
EL	I-Device
bypasses	O
the	O
slow	O
x86	B-Operating_System
hardware	O
emulation	B-Application
which	O
is	O
available	O
on	O
pre-Montecito	O
Itanium	B-General_Concept
models	O
.	O
</s>
<s>
The	O
IA-32	B-Device
EL	I-Device
used	O
a	O
two-phase	O
(	O
later	O
three-phase	O
)	O
approach	O
:	O
initially	O
it	O
quickly	O
translated	O
every	O
piece	O
of	O
code	O
at	O
a	O
basic	O
block	O
level	O
,	O
adding	O
certain	O
instrumentation	O
for	O
detecting	O
hot	O
code	O
;	O
then	O
hot	O
code	O
was	O
dynamically	O
optimized	O
at	O
a	O
super-block	O
level	O
,	O
and	O
the	O
optimized	O
translated	O
code	O
replaced	O
cold	O
code	O
on	O
the	O
fly	O
.	O
</s>
<s>
IA-32	B-Device
Execution	I-Device
Layer	I-Device
supported	O
self-modifying	B-Application
code	I-Application
,	O
and	O
could	O
even	O
optimize	O
it	O
quite	O
well	O
.	O
</s>
<s>
Part	O
of	O
the	O
software	O
is	O
under	O
the	O
LGPL	B-Application
and	O
part	O
is	O
under	O
an	O
Intel	O
proprietary	O
license	O
.	O
</s>
