<s>
In	O
a	O
computer	O
processor	B-General_Concept
the	O
negative	B-Algorithm
flag	I-Algorithm
or	O
sign	B-Algorithm
flag	I-Algorithm
is	O
a	O
single	O
bit	O
in	O
a	O
system	O
status	O
(	O
flag	O
)	O
register	O
used	O
to	O
indicate	O
whether	O
the	O
result	O
of	O
the	O
last	O
mathematical	O
operation	O
produced	O
a	O
value	O
in	O
which	O
the	O
most	O
significant	O
bit	O
(	O
the	O
left	O
most	O
bit	O
)	O
was	O
set	O
.	O
</s>
<s>
In	O
a	O
two	B-General_Concept
's	I-General_Concept
complement	I-General_Concept
interpretation	O
of	O
the	O
result	O
,	O
the	O
negative	B-Algorithm
flag	I-Algorithm
is	O
set	O
if	O
the	O
result	O
was	O
negative	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
an	O
8-bit	O
signed	O
number	O
system	O
,	O
-37	O
will	O
be	O
represented	O
as	O
1101	O
1011	O
in	O
binary	O
(	O
the	O
most	O
significant	O
bit	O
,	O
or	O
sign	B-Algorithm
bit	I-Algorithm
,	O
is	O
1	O
)	O
,	O
while	O
+37	O
will	O
be	O
represented	O
as	O
0010	O
0101	O
(	O
the	O
most	O
significant	O
bit	O
is	O
0	O
)	O
.	O
</s>
<s>
The	O
negative	B-Algorithm
flag	I-Algorithm
is	O
set	O
according	O
to	O
the	O
result	O
in	O
the	O
x86	B-Operating_System
series	O
processors	O
by	O
the	O
following	O
instructions	O
(	O
referring	O
to	O
the	O
Intel	B-General_Concept
80386	I-General_Concept
manual	O
)	O
:	O
</s>
<s>
TEST	B-Device
instructions	O
(	O
equivalent	O
to	O
AND	O
instructions	O
without	O
storing	O
the	O
result	O
)	O
.	O
</s>
