<s>
In	O
the	O
x86	B-Language
assembly	I-Language
programming	I-Language
language	I-Language
,	O
MOVDDUP	B-Device
is	O
the	O
name	O
for	O
a	O
specific	O
action	O
performable	O
by	O
modern	O
x86	B-Operating_System
processors	I-Operating_System
with	O
3rd-generation	O
Streaming	B-General_Concept
SIMD	I-General_Concept
Extensions	I-General_Concept
(	O
SSE3	B-General_Concept
)	O
.	O
</s>
<s>
Specifically	O
,	O
MOVDDUP	B-Device
causes	O
one	O
,	O
double-precision	O
,	O
floating-point	B-Algorithm
source	O
to	O
be	O
copied	O
to	O
both	O
the	O
lower	O
half	O
and	O
upper	O
half	O
of	O
an	O
XMM	B-General_Concept
register	O
.	O
</s>
<s>
The	O
source	O
operand	O
can	O
be	O
either	O
an	O
XMM	B-General_Concept
register	O
(	O
xmm2	O
)	O
or	O
a	O
memory	O
address	O
(	O
m64	O
)	O
.	O
</s>
<s>
When	O
the	O
source	O
operand	O
is	O
an	O
XMM	B-General_Concept
register	O
,	O
the	O
lower	O
half	O
of	O
the	O
register	O
is	O
used	O
in	O
the	O
operation	O
.	O
</s>
<s>
The	O
destination	O
operand	O
must	O
be	O
an	O
XMM	B-General_Concept
register	O
(	O
xmm1	O
)	O
.	O
</s>
