| Op Code (Hex) | Extender | Operand 1 | Operand 2 | Operand 3 | Operand [4-5] |
|---|---|---|---|---|---|
| XOR 109B |
| Receiver | Source 1 | Source 2 |
|
|
| |||||
| XORI 189B | Indicator options | Receiver | Source 1 | Source 2 | Indicator targets |
|
| |||||
| XORB 1C9B | Branch options | Receiver | Source 1 | Source 2 | Branch targets |
Operand 2: Character scalar or numeric scalar.
Operand 3: Character scalar or numeric scalar.
Operand 4-5:
| Op Code (Hex) | Extender | Operand 1 | Operand 2 | Operand [3-4] |
|---|---|---|---|---|
| XORS 119B |
| Receiver/Source 1 | Source 2 |
|
|
| ||||
| XORIS 199B | Indicator options | Receiver/Source 1 | Source 2 | Indicator targets |
|
| ||||
| XORBS 1D9B | Branch options | Receiver/Source 1 | Source 2 | Branch targets |
Operand 2: Character scalar or numeric scalar.
Operand 3-4:
Description: The Boolean exclusive or operation is performed on the string values in the source operands. The resulting string is placed in the receiver operand.
The operands may be character or numeric scalars. They are both interpreted as bit strings. Substringing is supported for both character and numeric operands.
The length of the operation is equal to the length of the longer of the two source operands. The shorter of the two operands is padded on the right. The operation begins with the two source operands left-adjusted and continues bit by bit until they are completed.
The bit values of the result are determined as follows:
| Source 1 Bit | Source 2 Bit | Result Bit | |
|---|---|---|---|
| 0 | 0 | 0 | |
| 0 | 1 | 1 | |
| 1 | 0 | 1 | |
| 1 | 1 | 0 |
The result value is then placed (left-adjusted) in the receiver operand with truncating or padding taking place on the right.
The pad value used in this instruction is a hex 00.
Substring operand references that allow for a null substring reference (a length value of zero) may be specified for operands 1, 2, and 3. The effect of specifying a null substring reference for one source operand is that the other source operand is exclusive ored with an equal length string of all hex 00s. When a null substring reference is specified for both source operands, the result is all zero and the instruction's resultant condition is zero. When a null substring reference is specified for the receiver, a result is not set and the instruction's resultant condition is zero regardless of the values of the source operands.
If operands overlap but do not share all of the same bytes, results of operations performed on these operands are not predictable. If overlapped operands share all of the same bytes, the results are predictable when direct addressing is used. If indirect addressing is used (that is, based operands, parameters, strings with variable lengths, and arrays with variable subscripts), the results are not always predictable.
When the receiver operand is a numeric variable scalar, it is possible that the result produced will not be a valid value for the numeric type. This can occur due to padding with hex 00, due to truncation, or due to the resultant bit string produced by the instruction. The instruction completes normally and signals no exceptions for these conditions.
06 Addressing
08 Argument/Parameter
10 Damage Encountered
1C Machine-Dependent
20 Machine Support
22 Object Access
24 Pointer Specification
2C Program Execution
2E Resource Control Limit
36 Space Management
44 Protection Violation