<s>
AVX-512	B-General_Concept
are	O
512-bit	O
extensions	O
to	O
the	O
256-bit	O
Advanced	B-General_Concept
Vector	I-General_Concept
Extensions	I-General_Concept
SIMD	B-Device
instructions	O
for	O
x86	B-Operating_System
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
(	O
ISA	O
)	O
proposed	O
by	O
Intel	O
in	O
July	O
2013	O
,	O
and	O
implemented	O
in	O
Intel	O
's	O
Xeon	B-General_Concept
Phi	I-General_Concept
x200	O
(	O
Knights	O
Landing	O
)	O
and	O
Skylake-X	O
CPUs	O
;	O
this	O
includes	O
the	O
Core-X	O
series	O
(	O
excluding	O
the	O
Core	O
i5-7640X	O
and	O
Core	O
i7-7740X	O
)	O
,	O
as	O
well	O
as	O
the	O
new	O
Xeon	B-Device
Scalable	I-Device
Processor	I-Device
Family	I-Device
and	O
Xeon	O
D-2100	O
Embedded	O
Series	O
.	O
</s>
<s>
AVX-512	B-General_Concept
consists	O
of	O
multiple	O
extensions	O
that	O
may	O
be	O
implemented	O
independently	O
.	O
</s>
<s>
Only	O
the	O
core	O
extension	O
AVX-512F	O
(	O
AVX-512	B-General_Concept
Foundation	O
)	O
is	O
required	O
by	O
all	O
AVX-512	B-General_Concept
implementations	O
.	O
</s>
<s>
Besides	O
widening	O
most	O
256-bit	O
instructions	O
,	O
the	O
extensions	O
introduce	O
various	O
new	O
operations	O
,	O
such	O
as	O
new	O
data	O
conversions	O
,	O
scatter	B-General_Concept
operations	O
,	O
and	O
permutations	O
.	O
</s>
<s>
The	O
number	O
of	O
AVX	B-General_Concept
registers	O
is	O
increased	O
from	O
16	O
to	O
32	O
,	O
and	O
eight	O
new	O
"	O
mask	O
registers	O
"	O
are	O
added	O
,	O
which	O
allow	O
for	O
variable	O
selection	O
and	O
blending	O
of	O
the	O
results	O
of	O
instructions	O
.	O
</s>
<s>
In	O
CPUs	O
with	O
the	O
vector	O
length	O
(	O
VL	O
)	O
extension	O
—	O
included	O
in	O
most	O
AVX-512-capable	O
processors	O
(	O
see	O
)	O
—	O
these	O
instructions	O
may	O
also	O
be	O
used	O
on	O
the	O
128-bit	O
and	O
256-bit	O
vector	O
sizes	O
.	O
</s>
<s>
AVX-512	B-General_Concept
is	O
not	O
the	O
first	O
512-bit	O
SIMD	B-Device
instruction	B-General_Concept
set	I-General_Concept
that	O
Intel	O
has	O
introduced	O
in	O
processors	O
:	O
the	O
earlier	O
512-bit	O
SIMD	B-Device
instructions	O
used	O
in	O
the	O
first	O
generation	O
Xeon	B-General_Concept
Phi	I-General_Concept
coprocessors	O
,	O
derived	O
from	O
Intel	O
's	O
Larrabee	B-Architecture
project	O
,	O
are	O
similar	O
but	O
not	O
binary	O
compatible	O
and	O
only	O
partially	O
source	O
compatible	O
.	O
</s>
<s>
The	O
AVX-512	B-General_Concept
instruction	B-General_Concept
set	I-General_Concept
consists	O
of	O
several	O
separate	O
sets	O
each	O
having	O
their	O
own	O
unique	O
CPUID	O
feature	O
bit	O
;	O
however	O
,	O
they	O
are	O
typically	O
grouped	O
by	O
the	O
processor	O
generation	O
that	O
implements	O
them	O
.	O
</s>
<s>
F	O
,	O
CD	O
,	O
ER	O
,	O
PF	O
Introduced	O
with	O
Xeon	B-General_Concept
Phi	I-General_Concept
x200	O
(	O
Knights	O
Landing	O
)	O
and	O
Xeon	O
Gold/Platinum	O
(	O
Skylake	O
SP	O
"	O
Purley	O
"	O
)	O
,	O
with	O
the	O
last	O
two	O
(	O
ER	O
and	O
PF	O
)	O
being	O
specific	O
to	O
Knights	O
Landing	O
.	O
</s>
<s>
VL	O
,	O
DQ	O
,	O
BW	O
Introduced	O
with	O
Skylake	O
X	O
and	O
Cannon	B-Device
Lake	I-Device
.	O
</s>
<s>
IFMA	O
,	O
VBMI	O
Introduced	O
with	O
Cannon	B-Device
Lake	I-Device
.	O
</s>
<s>
AVX-512	B-General_Concept
Integer	O
Fused	O
Multiply	O
Add	O
(	O
IFMA	O
)	O
–	O
fused	O
multiply	O
add	O
of	O
integers	O
using	O
52-bit	O
precision	O
.	O
</s>
<s>
AVX-512	B-General_Concept
Vector	O
Byte	O
Manipulation	O
Instructions	O
(	O
VBMI	O
)	O
adds	O
vector	O
byte	O
permutation	O
instructions	O
which	O
were	O
not	O
present	O
in	O
AVX-512BW	O
.	O
</s>
<s>
AVX-512	B-General_Concept
Vector	O
Neural	O
Network	O
Instructions	O
Word	O
variable	O
precision	O
(	O
4VNNIW	O
)	O
–	O
vector	O
instructions	O
for	O
deep	O
learning	O
,	O
enhanced	O
word	O
,	O
variable	O
precision	O
.	O
</s>
<s>
AVX-512	B-General_Concept
Fused	O
Multiply	O
Accumulation	O
Packed	O
Single	O
precision	O
(	O
4FMAPS	O
)	O
–	O
vector	O
instructions	O
for	O
deep	O
learning	O
,	O
floating	O
point	O
,	O
single	O
precision	O
.	O
</s>
<s>
Introduced	O
with	O
Knights	O
Mill	O
and	O
Ice	B-Device
Lake	I-Device
.	O
</s>
<s>
VNNI	O
,	O
VBMI2	O
,	O
BITALGIntroduced	O
with	O
Ice	B-Device
Lake	I-Device
.	O
</s>
<s>
AVX-512	B-General_Concept
Vector	O
Neural	O
Network	O
Instructions	O
(	O
VNNI	O
)	O
–	O
vector	O
instructions	O
for	O
deep	O
learning	O
.	O
</s>
<s>
AVX-512	B-General_Concept
Vector	O
Byte	O
Manipulation	O
Instructions	O
2	O
(	O
VBMI2	O
)	O
–	O
byte/word	O
load	O
,	O
store	O
and	O
concatenation	O
with	O
shift	O
.	O
</s>
<s>
AVX-512	B-General_Concept
Bit	O
Algorithms	O
(	O
BITALG	O
)	O
–	O
byte/word	O
bit	B-Algorithm
manipulation	I-Algorithm
instructions	O
expanding	O
VPOPCNTDQ	O
.	O
</s>
<s>
VP2INTERSECT	O
Introduced	O
with	O
Tiger	B-Device
Lake	I-Device
.	O
</s>
<s>
AVX-512	B-General_Concept
Vector	O
Pair	O
Intersection	O
to	O
a	O
Pair	O
of	O
Mask	O
Registers	O
(	O
VP2INTERSECT	O
)	O
.	O
</s>
<s>
GFNI	O
,	O
VPCLMULQDQ	O
,	O
VAESIntroduced	O
with	O
Ice	B-Device
Lake	I-Device
.	O
</s>
<s>
These	O
are	O
not	O
AVX-512	B-General_Concept
features	O
per	O
se	O
.	O
</s>
<s>
Together	O
with	O
AVX-512	B-General_Concept
,	O
they	O
enable	O
EVEX	B-General_Concept
encoded	O
versions	O
of	O
GFNI	O
,	O
PCLMULQDQ	B-Device
and	O
AES	B-Algorithm
instructions	O
.	O
</s>
<s>
The	O
VEX	B-General_Concept
prefix	I-General_Concept
used	O
by	O
AVX	B-General_Concept
and	O
AVX2	O
,	O
while	O
flexible	O
,	O
did	O
not	O
leave	O
enough	O
room	O
for	O
the	O
features	O
Intel	O
wanted	O
to	O
add	O
to	O
AVX-512	B-General_Concept
.	O
</s>
<s>
This	O
has	O
led	O
them	O
to	O
define	O
a	O
new	O
prefix	O
called	O
EVEX	B-General_Concept
.	O
</s>
<s>
Compared	O
to	O
VEX	B-General_Concept
,	O
EVEX	B-General_Concept
adds	O
the	O
following	O
benefits	O
:	O
</s>
<s>
Adds	O
8	O
new	O
opmask	O
registers	O
for	O
masking	O
most	O
AVX-512	B-General_Concept
instructions	O
.	O
</s>
<s>
Adds	O
a	O
new	O
compressed	O
displacement	O
memory	O
addressing	B-Language
mode	I-Language
.	O
</s>
<s>
The	O
extended	O
registers	O
,	O
SIMD	B-Device
width	O
bit	O
,	O
and	O
opmask	O
registers	O
of	O
AVX-512	B-General_Concept
are	O
mandatory	O
and	O
all	O
require	O
support	O
from	O
the	O
OS	O
.	O
</s>
<s>
The	O
AVX-512	B-General_Concept
instructions	O
are	O
designed	O
to	O
mix	O
with	O
128/256	O
-bit	O
AVX/AVX2	O
instructions	O
without	O
a	O
performance	O
penalty	O
.	O
</s>
<s>
However	O
,	O
AVX-512VL	O
extensions	O
allows	O
the	O
use	O
of	O
AVX-512	B-General_Concept
instructions	O
on	O
128/256	O
-bit	O
registers	O
XMM/YMM	O
,	O
so	O
most	O
SSE	O
and	O
AVX/AVX2	O
instructions	O
have	O
new	O
AVX-512	B-General_Concept
versions	O
encoded	O
with	O
the	O
EVEX	B-General_Concept
prefix	I-General_Concept
which	O
allow	O
access	O
to	O
new	O
features	O
such	O
as	O
opmask	O
and	O
additional	O
registers	O
.	O
</s>
<s>
Unlike	O
AVX-256	O
,	O
the	O
new	O
instructions	O
do	O
not	O
have	O
new	O
mnemonics	O
but	O
share	O
namespace	O
with	O
AVX	B-General_Concept
,	O
making	O
the	O
distinction	O
between	O
VEX	B-General_Concept
and	O
EVEX	B-General_Concept
encoded	O
versions	O
of	O
an	O
instruction	O
ambiguous	O
in	O
the	O
source	O
code	O
.	O
</s>
<s>
Since	O
AVX-512F	O
only	O
works	O
on	O
32	O
-	O
and	O
64-bit	O
values	O
,	O
SSE	O
and	O
AVX/AVX2	O
instructions	O
that	O
operate	O
on	O
bytes	O
or	O
words	O
are	O
available	O
only	O
with	O
the	O
AVX-512BW	O
extension	O
(	O
byte	O
&	O
word	O
support	O
)	O
.	O
</s>
<s>
Name	O
Extension	O
sets	O
Registers	O
Types	O
Legacy	O
SSE	O
SSE	O
–	O
SSE4.2	O
xmm0	O
–	O
xmm15	O
single	O
floats	O
.	O
</s>
<s>
AVX-128	O
(	O
VEX	B-General_Concept
)	O
AVX	B-General_Concept
,	O
AVX2	O
xmm0	O
–	O
xmm15	O
bytes	O
,	O
words	O
,	O
doublewords	O
,	O
quadwords	O
,	O
single	O
floats	O
and	O
double	O
floats	O
.	O
</s>
<s>
AVX-256	O
(	O
VEX	B-General_Concept
)	O
AVX	B-General_Concept
,	O
AVX2	O
ymm0	O
–	O
ymm15	O
single	O
float	O
and	O
double	O
float	O
.	O
</s>
<s>
AVX-128	O
(	O
EVEX	B-General_Concept
)	O
AVX-512VL	O
xmm0	O
–	O
xmm31	O
(	O
k0	O
–	O
k7	O
)	O
doublewords	O
,	O
quadwords	O
,	O
single	O
float	O
and	O
double	O
float	O
.	O
</s>
<s>
With	O
AVX512-FP16	O
:	O
half	O
float	O
.	O
</s>
<s>
AVX-256	O
(	O
EVEX	B-General_Concept
)	O
AVX-512VL	O
ymm0	O
–	O
ymm31	O
(	O
k0	O
–	O
k7	O
)	O
doublewords	O
,	O
quadwords	O
,	O
single	O
float	O
and	O
double	O
float	O
.	O
</s>
<s>
With	O
AVX512-FP16	O
:	O
half	O
float	O
.	O
</s>
<s>
AVX-512	B-General_Concept
(	O
EVEX	B-General_Concept
)	O
AVX-512F	O
zmm0	O
–	O
zmm31	O
(	O
k0	O
–	O
k7	O
)	O
doublewords	O
,	O
quadwords	O
,	O
single	O
float	O
and	O
double	O
float	O
.	O
</s>
<s>
With	O
AVX512-FP16	O
:	O
half	O
float	O
.	O
</s>
<s>
The	O
width	O
of	O
the	O
SIMD	B-Device
register	O
file	O
is	O
increased	O
from	O
256	O
bits	O
to	O
512	O
bits	O
,	O
and	O
expanded	O
from	O
16	O
to	O
a	O
total	O
of	O
32	O
registers	O
ZMM0	O
–	O
ZMM31	O
.	O
</s>
<s>
These	O
registers	O
can	O
be	O
addressed	O
as	O
256	O
bit	O
YMM	O
registers	O
from	O
AVX	B-General_Concept
extensions	O
and	O
128-bit	O
XMM	O
registers	O
from	O
Streaming	B-General_Concept
SIMD	I-General_Concept
Extensions	I-General_Concept
,	O
and	O
legacy	O
AVX	B-General_Concept
and	O
SSE	B-General_Concept
instructions	I-General_Concept
can	O
be	O
extended	O
to	O
operate	O
on	O
the	O
16	O
additional	O
registers	O
XMM16-XMM31	O
and	O
YMM16-YMM31	O
when	O
using	O
EVEX	B-General_Concept
encoded	O
form	O
.	O
</s>
<s>
Most	O
AVX-512	B-General_Concept
instructions	O
may	O
indicate	O
one	O
of	O
8	O
opmask	O
registers	O
(	O
k0k7	O
)	O
.	O
</s>
<s>
The	O
opmask	O
registers	O
are	O
normally	O
16	O
bits	O
wide	O
,	O
but	O
can	O
be	O
up	O
to	O
64	O
bits	O
with	O
the	O
AVX-512BW	O
extension	O
.	O
</s>
<s>
The	O
opmask	O
register	O
is	O
the	O
reason	O
why	O
several	O
bitwise	O
instructions	O
which	O
naturally	O
have	O
no	O
element	O
widths	O
had	O
them	O
added	O
in	O
AVX-512	B-General_Concept
.	O
</s>
<s>
Unlike	O
the	O
rest	O
of	O
the	O
AVX-512	B-General_Concept
instructions	O
,	O
these	O
instructions	O
are	O
all	O
VEX	B-General_Concept
encoded	O
.	O
</s>
<s>
With	O
AVX-512DQ	O
8-bit	O
(	O
Byte	O
)	O
versions	O
were	O
added	O
to	O
better	O
match	O
the	O
needs	O
of	O
masking	O
8	O
64-bit	O
values	O
,	O
and	O
with	O
AVX-512BW	O
32-bit	O
(	O
Double	O
)	O
and	O
64-bit	O
(	O
Quad	O
)	O
versions	O
were	O
added	O
so	O
they	O
can	O
mask	O
up	O
to	O
64	O
8-bit	O
values	O
.	O
</s>
<s>
The	O
instructions	O
KORTEST	O
and	O
KTEST	O
can	O
be	O
used	O
to	O
set	O
the	O
x86	B-Operating_System
flags	O
based	O
on	O
mask	O
registers	O
,	O
so	O
that	O
they	O
may	O
be	O
used	O
together	O
with	O
non-SIMD	O
x86	B-Operating_System
branch	O
and	O
conditional	O
instructions	O
.	O
</s>
<s>
Many	O
AVX-512	B-General_Concept
instructions	O
are	O
simply	O
EVEX	B-General_Concept
versions	O
of	O
old	O
SSE	O
or	O
AVX	B-General_Concept
instructions	O
.	O
</s>
<s>
There	O
are	O
,	O
however	O
,	O
several	O
new	O
instructions	O
,	O
and	O
old	O
instructions	O
that	O
have	O
been	O
replaced	O
with	O
new	O
AVX-512	B-General_Concept
versions	O
.	O
</s>
<s>
These	O
foundation	O
instructions	O
also	O
include	O
the	O
extensions	O
from	O
AVX-512VL	O
and	O
AVX-512BW	O
since	O
those	O
extensions	O
merely	O
add	O
new	O
versions	O
of	O
these	O
instructions	O
instead	O
of	O
new	O
instructions	O
.	O
</s>
<s>
There	O
are	O
no	O
EVEX-prefixed	O
versions	O
of	O
the	O
blend	O
instructions	O
from	O
SSE4	B-General_Concept
;	O
instead	O
,	O
AVX-512	B-General_Concept
has	O
a	O
new	O
set	O
of	O
blending	O
instructions	O
using	O
mask	O
registers	O
as	O
selectors	O
.	O
</s>
<s>
Together	O
with	O
the	O
general	O
compare	O
into	O
mask	O
instructions	O
below	O
,	O
these	O
may	O
be	O
used	O
to	O
implement	O
generic	O
ternary	O
operations	O
or	O
cmov	O
,	O
similar	O
to	O
XOP	B-General_Concept
's	O
VPCMOV	O
.	O
</s>
<s>
Since	O
blending	O
is	O
an	O
integral	O
part	O
of	O
the	O
EVEX	B-General_Concept
encoding	O
,	O
these	O
instructions	O
may	O
also	O
be	O
considered	O
basic	O
move	O
instructions	O
.	O
</s>
<s>
AVX-512F	O
has	O
four	O
new	O
compare	O
instructions	O
.	O
</s>
<s>
Like	O
their	O
XOP	B-General_Concept
counterparts	O
they	O
use	O
the	O
immediate	O
field	O
to	O
select	O
between	O
8	O
different	O
comparisons	O
.	O
</s>
<s>
Unlike	O
their	O
XOP	B-General_Concept
inspiration	O
,	O
however	O
,	O
they	O
save	O
the	O
result	O
to	O
a	O
mask	O
register	O
and	O
initially	O
only	O
support	O
doubleword	O
and	O
quadword	O
comparisons	O
.	O
</s>
<s>
The	O
AVX-512BW	O
extension	O
provides	O
the	O
byte	O
and	O
word	O
versions	O
.	O
</s>
<s>
The	O
compress	O
and	O
expand	O
instructions	O
match	O
the	O
APL	B-Language
operations	O
of	O
the	O
same	O
name	O
.	O
</s>
<s>
They	O
use	O
the	O
opmask	O
in	O
a	O
slightly	O
different	O
way	O
from	O
other	O
AVX-512	B-General_Concept
instructions	O
.	O
</s>
<s>
A	O
new	O
set	O
of	O
permute	B-Algorithm
instructions	I-Algorithm
have	O
been	O
added	O
for	O
full	O
two	O
input	O
permutations	O
.	O
</s>
<s>
AVX-512BW	O
extends	O
the	O
instructions	O
to	O
also	O
include	O
16-bit	O
(	O
word	O
)	O
versions	O
,	O
and	O
the	O
AVX-512_VBMI	O
extension	O
defines	O
the	O
byte	O
versions	O
of	O
the	O
instructions	O
.	O
</s>
<s>
These	O
are	O
the	O
only	O
bitwise	O
vector	O
instructions	O
in	O
AVX-512F	O
;	O
EVEX	B-General_Concept
versions	O
of	O
the	O
two	O
source	O
SSE	O
and	O
AVX	B-General_Concept
bitwise	O
vector	O
instructions	O
AND	O
,	O
ANDN	O
,	O
OR	O
and	O
XOR	O
were	O
added	O
in	O
AVX-512DQ	O
.	O
</s>
<s>
The	O
reverse	O
of	O
the	O
sign/zero	O
extend	O
instructions	O
from	O
SSE4.1	O
.	O
</s>
<s>
Among	O
the	O
unique	O
new	O
features	O
in	O
AVX-512F	O
are	O
instructions	O
to	O
decompose	O
floating-point	O
values	O
and	O
handle	O
special	O
floating-point	O
values	O
.	O
</s>
<s>
The	O
instructions	O
in	O
AVX-512	B-General_Concept
conflict	O
detection	O
(	O
AVX-512CD	O
)	O
are	O
designed	O
to	O
help	O
efficiently	O
calculate	O
conflict-free	O
subsets	O
of	O
elements	O
in	O
loops	O
that	O
normally	O
could	O
not	O
be	O
safely	O
vectorized	B-Application
.	O
</s>
<s>
AVX-512	B-General_Concept
exponential	O
and	O
reciprocal	O
(	O
AVX-512ER	O
)	O
instructions	O
contain	O
more	O
accurate	O
approximate	O
reciprocal	O
instructions	O
than	O
those	O
in	O
the	O
AVX-512	B-General_Concept
foundation	O
;	O
relative	O
error	O
is	O
at	O
most	O
2−28	O
.	O
</s>
<s>
AVX-512	B-General_Concept
prefetch	O
(	O
AVX-512PF	O
)	O
instructions	O
contain	O
new	O
prefetch	O
operations	O
for	O
the	O
new	O
scatter	B-General_Concept
and	O
gather	O
functionality	O
introduced	O
in	O
AVX2	O
and	O
AVX-512	B-General_Concept
.	O
</s>
<s>
They	O
are	O
generally	O
only	O
found	O
in	O
Xeon	B-General_Concept
Phi	I-General_Concept
products	O
.	O
</s>
<s>
AVX-512DQ	O
adds	O
new	O
doubleword	O
and	O
quadword	O
instructions	O
.	O
</s>
<s>
AVX-512BW	O
adds	O
byte	O
and	O
words	O
versions	O
of	O
the	O
same	O
instructions	O
,	O
and	O
adds	O
byte	O
and	O
word	O
version	O
of	O
doubleword/quadword	O
instructions	O
in	O
AVX-512F	O
.	O
</s>
<s>
A	O
few	O
instructions	O
which	O
get	O
only	O
word	O
forms	O
with	O
AVX-512BW	O
acquire	O
byte	O
forms	O
with	O
the	O
AVX-512_VBMI	O
extension	O
(	O
VPERMB	O
,	O
VPERMI2B	O
,	O
VPERMT2B	O
,	O
VPMULTISHIFTQB	O
)	O
.	O
</s>
<s>
Two	O
new	O
instructions	O
were	O
added	O
to	O
the	O
mask	O
instructions	O
set	O
:	O
KADD	O
and	O
KTEST	O
(	O
B	O
and	O
W	O
forms	O
with	O
AVX-512DQ	O
,	O
D	O
and	O
Q	O
with	O
AVX-512BW	O
)	O
.	O
</s>
<s>
The	O
rest	O
of	O
mask	O
instructions	O
,	O
which	O
had	O
only	O
word	O
forms	O
,	O
got	O
byte	O
forms	O
with	O
AVX-512DQ	O
and	O
doubleword/quadword	O
forms	O
with	O
AVX-512BW	O
.	O
</s>
<s>
KUNPCKBW	O
was	O
extended	O
to	O
KUNPCKWD	O
and	O
KUNPCKDQ	O
by	O
AVX-512BW	O
.	O
</s>
<s>
Among	O
the	O
instructions	O
added	O
by	O
AVX-512DQ	O
are	O
several	O
SSE	O
and	O
AVX	B-General_Concept
instructions	O
that	O
did	O
n't	O
get	O
AVX-512	B-General_Concept
versions	O
with	O
AVX-512F	O
,	O
among	O
those	O
are	O
all	O
the	O
two	O
input	O
bitwise	O
instructions	O
and	O
extract/insert	O
integer	O
instructions	O
.	O
</s>
<s>
Since	O
they	O
are	O
not	O
only	O
new	O
to	O
AVX-512	B-General_Concept
they	O
have	O
both	O
packed/SIMD	O
and	O
scalar	O
versions	O
.	O
</s>
<s>
AVX512-VNNI	O
adds	O
EVEX-coded	O
instructions	O
described	O
below	O
.	O
</s>
<s>
With	O
AVX-512F	O
,	O
these	O
instructions	O
can	O
operate	O
on	O
512-bit	O
vectors	O
,	O
and	O
AVX-512VL	O
further	O
adds	O
support	O
for	O
128	O
-	O
and	O
256-bit	O
vectors	O
.	O
</s>
<s>
A	O
later	O
AVX-VNNI	O
extension	O
adds	O
VEX	B-General_Concept
encodings	O
of	O
these	O
instructions	O
which	O
can	O
only	O
operate	O
on	O
128	O
-	O
or	O
256-bit	O
vectors	O
.	O
</s>
<s>
AVX-VNNI	O
is	O
not	O
part	O
of	O
the	O
AVX-512	B-General_Concept
suite	O
,	O
it	O
does	O
not	O
require	O
AVX-512F	O
and	O
can	O
be	O
implemented	O
independently	O
.	O
</s>
<s>
EVEX-encoded	O
Galois	O
field	O
new	O
instructions	O
:	O
</s>
<s>
VPCLMULQDQ	O
with	O
AVX-512F	O
adds	O
an	O
EVEX-encoded	O
512-bit	O
version	O
of	O
the	O
PCLMULQDQ	B-Device
instruction	O
.	O
</s>
<s>
With	O
AVX-512VL	O
,	O
it	O
adds	O
EVEX-encoded	O
256	O
-	O
and	O
128-bit	O
versions	O
.	O
</s>
<s>
VPCLMULQDQ	O
alone	O
(	O
that	O
is	O
,	O
on	O
non-AVX512	O
CPUs	O
)	O
adds	O
only	O
VEX-encoded	O
256-bit	O
version	O
.	O
</s>
<s>
(	O
Availability	O
of	O
the	O
VEX-encoded	O
128-bit	O
version	O
is	O
indicated	O
by	O
different	O
CPUID	O
bits	O
:	O
PCLMULQDQ	B-Device
and	O
AVX	B-General_Concept
.	O
)	O
</s>
<s>
VEX	B-General_Concept
-	O
and	O
EVEX-encoded	O
AES	B-Algorithm
instructions	O
.	O
</s>
<s>
The	O
VEX	B-General_Concept
versions	O
can	O
be	O
used	O
without	O
AVX-512	B-General_Concept
support	O
.	O
</s>
<s>
An	O
extension	O
of	O
the	O
earlier	O
F16C	B-Device
instruction	B-General_Concept
set	I-General_Concept
,	O
adding	O
comprehensive	O
support	O
for	O
the	O
binary16	O
floating-point	O
numbers	O
(	O
also	O
known	O
as	O
FP16	O
,	O
float16	O
or	O
half-precision	O
floating-point	O
numbers	O
)	O
.	O
</s>
<s>
Subnormal	B-Algorithm
values	O
are	O
processed	O
at	O
full	O
speed	O
by	O
hardware	O
to	O
facilitate	O
using	O
the	O
full	O
dynamic	O
range	O
of	O
the	O
FP16	O
numbers	O
.	O
</s>
<s>
Unlike	O
VCVTPS2PH	O
from	O
F16C	B-Device
,	O
VCVTPS2PHX	O
has	O
a	O
different	O
encoding	O
that	O
also	O
supports	O
broadcasting	O
.	O
</s>
<s>
Unlike	O
VCVTPH2PS	O
from	O
F16C	B-Device
,	O
VCVTPH2PSX	O
has	O
a	O
different	O
encoding	O
that	O
also	O
supports	O
broadcasting	O
.	O
</s>
<s>
VGETMANTPH	O
,	O
VGETMANTSH	O
Extract	O
mantissa	B-Algorithm
components	O
of	O
packed/scalar	O
FP16	O
numbers	O
as	O
FP16	O
numbers	O
.	O
</s>
<s>
:	O
Intel	O
does	O
not	O
officially	O
support	O
AVX-512	B-General_Concept
family	O
of	O
instructions	O
on	O
the	O
Alder	B-Device
Lake	I-Device
microprocessors	O
.	O
</s>
<s>
Intel	O
has	O
disabled	O
in	O
silicon	O
(	O
fused	O
off	O
)	O
AVX-512	B-General_Concept
on	O
recent	O
steppings	O
of	O
Alder	B-Device
Lake	I-Device
microprocessors	O
to	O
prevent	O
customers	O
from	O
enabling	O
AVX-512	B-General_Concept
.	O
</s>
<s>
In	O
older	O
Alder	B-Device
Lake	I-Device
familiy	O
CPUs	O
with	O
some	O
legacy	O
combinations	O
of	O
BIOS	O
and	O
microcode	O
revisions	O
,	O
it	O
was	O
possible	O
to	O
execute	O
AVX-512	B-General_Concept
family	O
instructions	O
when	O
disabling	O
all	O
the	O
efficiency	O
cores	O
which	O
do	O
not	O
contain	O
the	O
silicon	O
for	O
AVX-512	B-General_Concept
.	O
</s>
<s>
Intel	B-General_Concept
Vectorization	I-General_Concept
Advisor	I-General_Concept
(	O
starting	O
from	O
version	O
2017	O
)	O
supports	O
native	O
AVX-512	B-General_Concept
performance	O
and	O
vector	O
code	O
quality	O
analysis	O
(	O
for	O
"	O
Core	O
"	O
,	O
Xeon	O
and	O
Intel	B-General_Concept
Xeon	I-General_Concept
Phi	I-General_Concept
processors	O
)	O
.	O
</s>
<s>
Along	O
with	O
traditional	O
hotspots	O
profile	O
,	O
Advisor	O
Recommendations	O
and	O
"	O
seamless	O
"	O
integration	O
of	O
Intel	O
Compiler	O
vectorization	O
diagnostics	O
,	O
Advisor	O
Survey	O
analysis	O
also	O
provides	O
AVX-512	B-General_Concept
ISA	O
metrics	O
and	O
new	O
AVX-512-specific	O
"	O
traits	O
"	O
,	O
e.g.	O
</s>
<s>
Scatter	B-General_Concept
,	O
Compress/Expand	O
,	O
mask	O
utilization	O
.	O
</s>
<s>
On	O
some	O
processors	O
AVX-512	B-General_Concept
instructions	O
cause	O
a	O
frequency	O
throttling	O
even	O
greater	O
than	O
its	O
predecessors	O
,	O
causing	O
a	O
penalty	O
for	O
mixed	O
workloads	O
.	O
</s>
<s>
The	O
additional	O
downclocking	O
is	O
triggered	O
by	O
the	O
512-bit	O
width	O
of	O
vectors	O
and	O
depend	O
on	O
the	O
nature	O
of	O
instructions	O
being	O
executed	O
,	O
and	O
using	O
the	O
128	O
or	O
256-bit	O
part	O
of	O
AVX-512	B-General_Concept
(	O
AVX-512VL	O
)	O
does	O
not	O
trigger	O
it	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
gcc	B-Application
and	O
clang	B-Application
default	O
to	O
prefer	O
using	O
the	O
256-bit	O
vectors	O
.	O
</s>
