<s>
K12	O
was	O
to	O
be	O
AMD	O
's	O
first	O
custom	O
microarchitecture	O
based	O
on	O
the	O
ARMv8-A	O
(	O
AArch64	B-Architecture
)	O
instruction	B-General_Concept
set	I-General_Concept
with	O
a	O
planned	O
release	O
in	O
2017	O
.	O
</s>
<s>
Its	O
predecessor	O
,	O
the	O
Opteron	B-General_Concept
A1100	O
series	O
,	O
also	O
ARMv8-A	O
,	O
used	O
ARM	O
Cortex-A57	O
cores	O
.	O
</s>
<s>
The	O
microarchitecture	O
was	O
to	O
focus	O
on	O
high	O
frequency	O
and	O
power	O
efficiency	O
and	O
was	O
to	O
target	O
the	O
dense	O
server	O
,	O
embedded	B-Architecture
and	O
semi-custom	O
market	O
segments	O
.	O
</s>
