737
Processor
Does
Not
Check
128
-bit
Canonical
Address
Boundary
Case
on
Logical
Address
Description
The
processor
core
may
not
detect
a
#
GP
exception
if
the
processor
is
in
64
-bit
mode
and
the
logical
address
of
a
128
-bit
operation
(
for
example
,
a
octal-word
SSE
instruction
)
is
canonical
on
the
first
byte
,
but
whose
final
byte
crosses
over
the
canonical
address
boundary
.
The
processor
does
check
the
linear
address
and
signals
a
#
GP
exception
if
the
linear
address
is
not
canonical
(
for
all
eight
bytes
of
the
operation
).
Therefore
,
this
erratum
can
only
occur
if
the
segment
register
is
non-zero
and
causes
a
wrap
in
the
logical
address
space
only
.
In
the
unlikely
event
that
software
causes
this
wrap
,
the
processor
core
will
execute
the
128
-bit
operation
as
if
the
second
part
of
the
misaligned
access
starts
at
linear
address
equal
to
zero
.
Potential
Effect
on
System
None
expected
,
as
the
normal
usage
of
segment
registers
and
segment
limits
does
not
expose
this
erratum
.
Suggested
Workaround
None
required
.
Fix
Planned
No
fix
planned
Revision
Guide
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
48063
Rev
. 3.18
October
2012
84
Product
Errata