<s>
Ikarus	B-Language
Scheme	I-Language
is	O
a	O
free	B-Application
software	I-Application
optimizing	O
incremental	B-Application
compiler	I-Application
for	O
R6RS	O
Scheme	B-Language
that	O
compiles	B-Language
directly	O
to	O
the	O
x86	B-Operating_System
IA-32	B-Device
architecture	O
.	O
</s>
<s>
Ikarus	B-Language
is	O
the	O
first	O
public	O
implementation	O
of	O
a	O
large	O
part	O
of	O
the	O
R6RS	O
Scheme	B-Language
standard	O
.	O
</s>
<s>
The	O
compiler	B-Language
developer	O
,	O
Abdulaziz	O
Ghuloum	O
,	O
was	O
a	O
Ph.D.	O
student	O
at	O
Indiana	O
University	O
under	O
R	O
.	O
Kent	O
Dybvig	O
,	O
the	O
developer	O
of	O
Chez	B-Language
Scheme	I-Language
,	O
who	O
has	O
influenced	O
the	O
development	O
of	O
Ikarus	B-Language
.	O
</s>
<s>
Some	O
of	O
the	O
ideas	O
behind	O
the	O
design	O
of	O
Ikarus	B-Language
Scheme	I-Language
are	O
detailed	O
in	O
"	O
An	O
Incremental	O
Approach	O
to	O
Compiler	B-Language
Construction	O
"	O
by	O
the	O
developer	O
.	O
</s>
<s>
Ikarus	B-Language
is	O
self-hosting	O
with	O
most	O
of	O
the	O
compiler	B-Language
and	O
primitives	O
written	O
in	O
Scheme	B-Language
and	O
only	O
a	O
few	O
parts	O
of	O
the	O
runtime	B-Device
system	I-Device
written	O
in	O
C	B-Language
.	O
Also	O
,	O
rather	O
than	O
using	O
an	O
external	O
intermediate	O
language	O
like	O
C	B-Language
,	O
LLVM	B-Application
,	O
or	O
C--	B-Language
,	O
it	O
compiles	B-Language
directly	O
to	O
machine	B-Language
code	I-Language
to	O
better	O
exploit	O
the	O
underlying	O
machine	O
architecture	O
.	O
</s>
<s>
Ikarus	B-Language
uses	O
the	O
portable	O
R6RS	O
library	O
and	O
syntax-case	O
system	O
which	O
is	O
also	O
developed	O
by	O
Abdulaziz	O
Ghuloum	O
and	O
is	O
described	O
in	O
a	O
paper	O
,	O
"	O
Implicit	O
phasing	O
for	O
R6RS	O
libraries	O
"	O
.	O
</s>
<s>
Finally	O
,	O
the	O
paper	O
"	O
Generation-Friendly	O
Eq	O
Hash	O
Tables	O
"	O
covers	O
the	O
hash	O
table	O
implementation	O
in	O
Ikarus	B-Language
.	O
</s>
<s>
Ikarus	B-Language
runs	O
on	O
x86	B-Operating_System
but	O
requires	O
SSE2	B-General_Concept
support	O
to	O
handle	O
floating-point	B-Algorithm
arithmetic	I-Algorithm
(	O
FP	O
)	O
computations	O
so	O
it	O
will	O
not	O
produce	O
code	O
for	O
Intel	O
chips	O
earlier	O
than	O
Pentium	B-General_Concept
4	I-General_Concept
or	O
for	O
Advanced	O
Micro	O
Devices	O
(	O
AMD	O
)	O
chips	O
before	O
Athlon	O
64	O
.	O
</s>
