The second operand is placed unchanged in the first operand location, and the sign and magnitude of the second operand determine the condition code.
Condition Code:
0 Result is zero
1 Result is less than zero
2 Result is greater than zero
3 -
Program Exceptions:
None.
Programming Note
When the R1 and R2 fields designate the same register, the operation is
equivalent to a test without data movement.