<s>
FCMOV	B-Device
is	O
a	O
floating	O
point	O
conditional	O
move	O
opcode	B-Language
of	O
the	O
Intel	B-Operating_System
x86	I-Operating_System
architecture	O
,	O
first	O
introduced	O
in	O
Pentium	B-Device
Pro	I-Device
processors	O
.	O
</s>
<s>
It	O
copies	O
the	O
contents	O
of	O
one	O
of	O
the	O
floating	O
point	O
stack	O
register	O
,	O
depending	O
on	O
the	O
contents	O
of	O
EFLAGS	B-General_Concept
integer	O
flag	O
register	O
,	O
to	O
the	O
ST(0 )	O
(	O
top	O
of	O
stack	O
)	O
register	O
.	O
</s>
<s>
Similar	O
to	O
the	O
CMOV	O
instruction	O
,	O
FCMOV	B-Device
allows	O
some	O
conditional	O
operations	O
to	O
be	O
performed	O
without	O
the	O
usual	O
branching	B-General_Concept
overhead	O
.	O
</s>
<s>
However	O
,	O
it	O
has	O
a	O
higher	O
latency	O
than	O
conditional	B-General_Concept
branch	I-General_Concept
instructions	O
.	O
</s>
<s>
This	O
table	O
shows	O
the	O
variants	O
of	O
the	O
FCMOV	B-Device
instructions	O
.	O
</s>
<s>
The	O
Opcode	B-Language
column	O
indicates	O
a	O
two-byte	O
sequence	O
where	O
the	O
second	O
byte	O
is	O
a	O
base	O
value	O
indicating	O
the	O
number	O
of	O
the	O
floating	O
point	O
stack	O
register	O
to	O
use	O
for	O
the	O
second	O
operand	O
.	O
</s>
<s>
Add	O
the	O
desired	O
number	O
to	O
complete	O
the	O
corresponding	O
opcode	B-Language
value	O
.	O
</s>
