Xerox 560 Reference Manual

Instruction Name
Mnemonic
Compare
Halfword
CH
Compare Word
CW
Compare Doubleword
CD
Compare Selective
CS
Compare With Limits in Register
CLR
Compare With Limits in Memory
CLM
All comparison instructions produce a condition code
setting which is indicative of the results of the com-
parison, without affecting the effective operand in mem-
ory and without affecting the contents of the designated
register.
CI COMPARE IMMEDIATE
(Immediate
operand)
o 1
COMPARE IMMEDIATE extends the sign of the value field
(bi t posi tion 12) of the instruction word 12 bi t posi ti ons to
the left, compares the 32-bit result with the contents of
register R (with both operands treated as signed fixed-point
quantities), and then sets the condition code according to
rhe resuirs or rhe comparison.
Affected: CC2, CC3, CC4
(R) : (I)12-31SE
Condition code settings:
Trap: Nonexistent instruc-
tion if bit 0 is a 1.
2 3 4 Result of Comparison
-
0 0 Equal.
- 0 Register value less than immediate value.
o Register value greater than immediate value.
- 0
No 1-bits compare, (R) n (1)12-32SE = O.
One or more 1-bi ts compare,
(R) n (I) 12-32S E I O.
If CI is indirectly addressed, it is treated as a nonexistent
instruction, in which case the basic processor uncondi-
tionally aborts execution of the instruction (at the time of
operation code decoding) and then traps to location X'40'
with the condition code unchanged.
CB
COMPARE BYTE
(Byte index alignment)
COMPARE BYTE compares the contents of bit positions 24-31
of register R with the effective byte (with both bytes treated
as positive integer magnitudes) and sets the condition code
according to the results of the comparison.
Affected: CC2, CC3, CC4
(R)24-31 : EB
Condition code settings:
2
3 4
Resu I t of Compari son
-
0 0
Equal.
0
Register byte less than effective byte.
0
Register byte greater than effective byte.
- 0
No 1-bits compare, (R)24-31 n EB = O.
CH
One or more 1-bits compare,
(R)24-31 n EB I O.
COMPARE HALFWORD
(Halfword index alignment)
COMPARE HALFWORD extends the sign of the effective
halfword 16 bit positions to the left, then compares the
resultant 32-bit word with the contents of register R (with
both words
treated as signed, fixed-point quantities) and
sets
the condition code according to the results of the
comparison.
Affected: CC2, CC3, CC4
(R) : EHSE
Condition code settings:
2 3 4
Result of Comparison
-
0 0 Equal.
- 0 Register word less than effective halfword
with sign extended.
o Register word greater than effective halfword
with sign extended.
Comparison Instructions 67

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