<s>
SISAL	B-Language
(	O
Streams	B-Language
and	I-Language
Iteration	I-Language
in	I-Language
a	I-Language
Single	I-Language
Assignment	I-Language
Language	I-Language
)	O
is	O
a	O
general-purpose	O
single	O
assignment	O
functional	B-Language
programming	I-Language
language	I-Language
with	O
strict	O
semantics	O
,	O
implicit	B-Operating_System
parallelism	I-Operating_System
,	O
and	O
efficient	O
array	O
handling	O
.	O
</s>
<s>
SISAL	B-Language
outputs	O
a	O
dataflow	B-Application
graph	O
in	O
Intermediary	O
Form	O
1	O
(	O
IF1	O
)	O
.	O
</s>
<s>
It	O
has	O
a	O
Pascal-like	O
syntax	O
and	O
was	O
designed	O
to	O
be	O
a	O
common	O
high-level	O
language	O
for	O
numerical	O
programs	O
on	O
a	O
variety	O
of	O
multiprocessors	B-Operating_System
.	O
</s>
<s>
SISAL	B-Language
was	O
defined	O
in	O
1983	O
by	O
James	O
McGraw	O
et	O
al.	O
,	O
at	O
the	O
University	O
of	O
Manchester	O
,	O
LLNL	O
,	O
Colorado	O
State	O
University	O
and	O
DEC	O
.	O
</s>
<s>
Its	O
performance	O
is	O
superior	O
to	O
C	B-Language
and	O
rivals	O
Fortran	B-Application
,	O
according	O
to	O
some	O
sources	O
,	O
combined	O
with	O
efficient	O
and	O
automatic	O
parallelization	O
.	O
</s>
<s>
SISAL	B-Language
's	O
name	O
came	O
from	O
grepping	O
"	O
sal	O
"	O
for	O
"	O
Single	O
Assignment	O
Language	O
"	O
from	O
the	O
Unix	O
dictionary	O
/usr/dict/words	O
.	O
</s>
<s>
Versions	O
exist	O
for	O
the	O
Cray	B-Device
X-MP	I-Device
,	O
Y-MP	B-Device
,	O
2	B-Device
;	O
Sequent	O
,	O
Encore	O
Alliant	O
,	O
DEC	B-Device
VAX-11/784	I-Device
,	O
dataflow	B-Application
architectures	O
,	O
KSR1	O
,	O
Transputers	B-General_Concept
and	O
systolic	B-Architecture
arrays	I-Architecture
.	O
</s>
<s>
The	O
requirements	O
for	O
a	O
fine-grain	O
parallelism	O
language	O
are	O
better	O
met	O
with	O
a	O
dataflow	B-Application
language	O
than	O
a	O
systems	O
language	O
.	O
</s>
<s>
SISAL	B-Language
is	O
more	O
than	O
just	O
a	O
dataflow	B-Application
and	O
fine-grain	O
language	O
.	O
</s>
<s>
It	O
is	O
a	O
set	O
of	O
tools	O
that	O
convert	O
a	O
textual	O
human	O
readable	O
dataflow	B-Application
language	O
into	O
a	O
graph	O
format	O
(	O
named	O
IF1	O
-	O
Intermediary	O
Form	O
1	O
)	O
.	O
</s>
<s>
Part	O
of	O
the	O
SISAL	B-Language
project	O
also	O
involved	O
converting	O
this	O
graph	O
format	O
into	O
runable	O
C	B-Language
code	O
.	O
</s>
<s>
In	O
2010	O
SISAL	B-Language
saw	O
a	O
brief	O
resurgence	O
when	O
a	O
group	O
of	O
undergraduates	O
at	O
Worcester	O
Polytechnic	O
Institute	O
investigated	O
implementing	O
a	O
fine-grain	O
parallelism	O
backend	O
for	O
the	O
SISAL	B-Language
language	O
.	O
</s>
<s>
In	O
2018	O
SISAL	B-Language
was	O
modernized	O
with	O
indent-based	O
syntax	O
,	O
first-class	O
functions	O
,	O
lambdas	O
,	O
closures	O
and	O
lazy	O
semantics	O
within	O
a	O
project	O
SISAL-IS	O
.	O
</s>
