<s>
Extended	B-Device
MMX	I-Device
refers	O
to	O
one	O
of	O
two	O
possible	O
extensions	O
to	O
the	O
MMX	B-Architecture
instruction	I-Architecture
set	I-Architecture
for	O
x86	B-Operating_System
.	O
</s>
<s>
Included	O
in	O
Intel	O
's	O
Streaming	B-General_Concept
SIMD	I-General_Concept
Extensions	I-General_Concept
were	O
a	O
number	O
of	O
new	O
instructions	O
that	O
extended	O
the	O
functionality	O
of	O
MMX	B-Architecture
.	O
</s>
<s>
AMD	O
incorporated	O
this	O
subset	O
of	O
extended	B-Device
MMX	I-Device
instructions	O
into	O
the	O
Athlon	B-Architecture
microarchitecture	O
.	O
</s>
<s>
These	O
instructions	O
are	O
commonly	O
known	O
as	O
"	O
Extended	B-Device
MMX	I-Device
instructions	O
"	O
.	O
</s>
<s>
These	O
instructions	O
debuted	O
in	O
May	O
1999	O
,	O
in	O
the	O
Intel	B-General_Concept
Pentium	I-General_Concept
III	I-General_Concept
Processor	I-General_Concept
,	O
as	O
part	O
of	O
the	O
SSE	B-General_Concept
instruction	O
set	O
.	O
</s>
<s>
Next	O
month	O
,	O
in	O
late	O
June	O
1999	O
,	O
AMD	O
's	O
Athlon	B-Architecture
processor	O
was	O
released	O
which	O
featured	O
the	O
extended	B-Device
MMX	I-Device
instructions	O
,	O
but	O
not	O
SSE	B-General_Concept
.	O
</s>
<s>
Today	O
,	O
these	O
extended	B-Device
MMX	I-Device
instructions	O
are	O
notable	O
as	O
being	O
the	O
common	O
subset	O
of	O
MMX	B-Architecture
extensions	O
that	O
work	O
across	O
both	O
AMD	B-Architecture
Athlon	I-Architecture
and	O
SSE-capable	O
Intel	O
processors	O
.	O
</s>
<s>
Less	O
commonly	O
known	O
,	O
"	O
Extended	B-Device
MMX	I-Device
"	O
could	O
also	O
refer	O
to	O
the	O
original	O
Cyrix	O
EMMI	O
(	O
Extended	O
Multi-Media	O
Instructions	O
)	O
.	O
</s>
<s>
This	O
instruction	O
set	O
was	O
developed	O
by	O
Cyrix	O
and	O
implemented	O
on	O
their	O
6x86	B-General_Concept
MX	O
and	O
MII	O
line	O
of	O
processors	O
.	O
</s>
<s>
It	O
extended	O
the	O
MMX	B-Architecture
instruction	I-Architecture
set	I-Architecture
with	O
12	O
new	O
instructions	O
useful	O
in	O
multimedia	O
applications	O
.	O
</s>
<s>
EMMI	O
was	O
never	O
given	O
much	O
support	O
from	O
software	O
developers	O
or	O
acknowledged	O
by	O
Cyrix	O
's	O
competitors	O
(	O
certain	O
Intel	O
SSE	B-General_Concept
instructions	I-General_Concept
even	O
share	O
opcodes	O
with	O
EMMI	O
instructions	O
)	O
.	O
</s>
