Xerox 550 - Clr

2 3 4 Result of Comparison
- a
CW
No l-bits compare, (R) n EHSE = O.
One or more l-bits compare,
(R) n EHSE I a.
COMPARE WORD
(Word index alignment)
COMPARE WORD compares the contents of register R with
the effective word, with both words treated as signed fixed-
point quantiti es, and sets the condition code according to
the resu I ts of the compari son.
Affected: CC2, CC3, CC4
(R) : EW
Condition code settings:
2
3
4
Result of Comparison
-
a
a
Equal.
-
a
Register word less than effective word.
a Register word greater than effective word.
- a
No l-bits compare, (R) n EW = a.
One or more l-bits compare, (R) n EW I a.
CD
COMPARE DOUBLEWORD
COMPARE DOUBLEWORD compares the effective double-
word with the contents of registers Rand Rv 1 (with both
doublewords treated as signed, fixed-point quantities)
and sets the condi ti on code accordi ng to the resu I ts of the
comparison. If the R field of CD is an odd value, CD forms
a
64-bit register operand (by duplicating the contents of
register R for both the 32 high-order bits and the 32 low-
order bits) and compares the effective doubleword with the
64-bit register operand. The condition code settings are
based on the 64-bit comparison.
Affected: CC3, CC4
(R, Rul) : ED
Condition code settings:
2 3 4 Result of Comparison
a a Equal.
- a Register doubleword less than effective
doubleword.
a Register doubleword greater than effective
doubleword.
CS COMPARE SELECTIVE
COMPARE SE LECTIVE compares the contents of register R
with the effective v;ord in on Iy those bit positions selected
by a 1 in corresponding bit positions of register Rul (mask).
The
contents of register R and the effective word are ignored
in those bit positions designated by a a in corresponding bit
positions of register Rul. The selected contents of register R
and the effective word are treated as positive integer mag-
nitudes, and the condition code is set according to the re-
sult of the comparison. If the R fieldof CS is an odd value;
CS compares the contents of register R with the logical
product (AND) of the effective word and the contents of
register R.
Affected: CC3, CC4
If R is even: (R) n (Rul) : EW n (Rul)
If R is
odd: (R): EW n (R)
Condition code settings:
2 3 4 Resu I ts of Compari son under Mask in Ru 1
- a a Equal.
- a
Register word less than effective word.
a Register word greater than effective word.
(if R is
even).
CLR COMPARE WITH LIMITS IN REGISTERS
(Word index alignment)
H
o 1 2
COMPARE WITH LIMITS IN REGISTERS simultaneously
compares the effective word with the contents of register R
and with the contents of register Rul (with all three words
treated as signed fixed-point quantities), and sets the con-
dition code according to the results of the comparisons.
Affected: CC
(R) : EW, (Rul) : EW
Comparison Instructions 67