Logical Instructions - Xerox 560 Reference Manual

Condition code settings:
2 3 4 Result of Comparison
- a a
Contents of R equal to effective word.
a
Contents of R less than effective word.
a
Contents of R greater than effective word.
a a
- Contents of Ru 1 equa
I
to effecti ve word.
a
- Contents of Ru1 less than effective word.
a
- Contents of Ru 1 greater than effective word.
elM
COMPARE WITH LIMITS IN MEMORY
(Doubleword index alignment)
COMPARE WITH LIMITS IN MEMORY simultaneously com-
pares the contents of register R with the 32 high-order bits
of the effective doubleword and with the 32 low-order bits
of the effective doubleword, with all three words treated
as 32-bit signed quantities, and sets the condition code
according to the results of the comparisons.
Affected: CC
(R) : ED
O
_
31
; (R) : ED
32
_
63
Condition code settings:
2 3 4 Result of Comparison
- - a a
Contents of R equal to most significant word,
(R)
=
ED
O
_
31
'
- 0 Contents of R less than most significant word,
(R)
<
ED
O
_
31
'
a
Contents of R greater than most significant
word, (R)
>
ED
O
_
31
'
a a
- Contents of R equal to least significant word,
(R) = ED
32
_
63
.
a
a
- Contents of R less than least significant word,
(R)
<
ED
32
_
63
.
- Contents of R greater than least signifi cant
word, (R)
>
ED
32
_
63
.
LOGICAL INSTRUCTIONS
All logical operations are performed bit by corresponding
bit between two operands; one operand is in register Rand
the other operand is the effective word. The result of the
logical operation is loaded into register R.
OR
OR WORD
0Nord index alignment)
OR WORD logically ORs the effective word into register R.
If
corresponding bits of register R and the effective word
are both 0, a
a
remains in register R; otherwise, a 1 is
placed in the corresponding bit position of register R. The
effective word is not affected.
Affected: (R), CC3, CC4
(R) u EW - R, where
a
u
a
=
0,
a
u 1
=
1, 1 u
a
=
1,
1
u
1
=
1
Condi ti on code setti ngs:
2 3 4 Result in R
- 0 0
Zero.
o
Bit
0
of register R is a 1.
EOR
o
Bit 0 of register R is a
a
and bit positions 1-31
of register R contain at least one
1.
EXCLUSIVE OR WORD
0Nord index alignment)
EXCLUSIVE OR WORD logically exclusive ORs the effec-
tive word into register R.
If
corresponding bits of regis-
ter R and the effective word are different, a 1 is placed in
the corresponding bit position of register R; if the contents
of the corresponding bit positions are alike, a
a
is placed
in the corresponding bit position of register R. The effec-
tive word is not affected.
Affected: (R), CC3, CC4
(R)
@
EW-R
Condition code settings:
2 3 4 Resu
I
tin R
- - 0
a
Zero.
- 0 Bit 0 of register R is a 1.
o
Bit
a
of register R is a
a
and bit positions 1-31
of register R contain at least one
1.
Logical Instructions 69