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К этому устройству также есть другие инструкции:
Фрагмент инструкции
it
is
able
to
take
particular
adv
an
tage
of
that
arc
hitecture.
Ho
w
ev
er,
SPL
is
so
arc
hitecture-dep enden
t
that
it
has
not
b een
migrated
to
Native
Mo
de.
Consequen
tly
,
the
user
of
SPL
pro cedures
is
faced
with
t
w
o
options:
1.
Rewrite
all
SPL
pro cedures
in
higher-lev
el
languages
that
can
b e
compiled
directly
in
Native
Mo
de.
2.
If
rewriting
is
not
feasible
or
the
pro cedure
is
not
p erformance-sensitive,
use
Switch
to
con
tinue
to
call
suc
h
pro cedures
but
call
them
from
co de
that
has
b een
migrated
to
(recompiled
in)
Native
Mo
de.
Other
factors
may
motiv
ate
CM|>
NM
switching.
A
common
situation
in
v
olv
es
the
most
p erformance-sensitive
p ortions
of
y
our
application.
These
are
probably
the
rst
pieces
of
co de
y
ou
w
an
t
to
recompile
or
rewrite.
Mixed-mo
de
pro cedure
calling
allo ws
y
ou
to
migrate
those
p ortions
to
Nativ
e
Mo
de
to
obtain
the
p erformance
gains,
while
still
running
the
remainder
of
the
application
in
Compatibility
Mo
de.
This
pro
vides
a
con
tinual,
incremen
tal
upgrade
path.
Be
sure
that
the
o
v
erhead
of
the
Switch
is
out
w
eighed
b
y
the
p erformance
adv
an
tage
of
running
that
co de
in
Native
Mo
de.
Relationship
to
Migration
When
y
ou
mov
e
y
our
application
or
subsystem
from
MPE
V/E-
to
MPE
XL-based
systems,
y
ou
can
carry
out
this
migration
in
a
phased
manner.
Phased
migration
refers
to
the
abilit
y
to
con
v
ert
y
our
application
in
steps
from
100%
CM
execution
to,
p oten
tially
,
100%
NM
execution.
Because
Hewlett-Pac
k
ard
has
pro
vided
ob
ject
co de
compatibility
,
most
applications
can
b e
restored
and
execute
in
Compatibility
Mo
de
without
c
hanges.
Y
ou
can
then
migrate
a
p ortion
of
y
our
application
to
Native
Mo
de
to
take
adv
an
tage
of
increased
p erformance
and
added
features.
Y
ou
can
c
ho ose
to
migrate
y
our
database,
application
programs,
or
application
libraries
indep enden
tly
of
one
another.
It
is
this
capabilit
y
to
migrate
p ortions
of
an
application
o
v
er
time
that
makes
up
the
phased
migration
feature
of
MPE
XL.
Since
the
HP
Precision
Arc
hitecture
is
dieren
t
from
that
of
non-MPE
XL-based
HP
3000
family
mem
b ers,
users
of
the
900
Series
face
certain
dierences
when
migrating
to
the
MPE
XL
en
vironmen
t.
F
urthermore,
migration
do es
not
end
when
an
MPE
XL-based
system
is
installed.
In
man
y
instances,
Series
900
systems
will
b e
used
in
b oth
net
w
orks
and
en
vironmen
ts
alongside
MPE
V/E-based
systems.
The
transfer
of
information
b et
w
een
these
1-20
Introduction
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