| Op Code (Hex) | Operand 1 | Operand 2 | Operand 3 | |
|---|---|---|---|---|
| 102F | Receiver | Source | Shift control |
Operand 2: Character scalar or numeric scalar.
Operand 3: Character(2) scalar or unsigned binary(2) scalar.
Description: This instruction copies the bit string value of the source operand to the bit string defined by the receiver operand with a left logical shift of the source bit string value under control of the shift control operand.
The operation results in copying the shifted bit string value of the source to the bit string of the receiver while padding the receiver with bit values of 0 and truncating bit values of the source as is appropriate for the specific operation.
No indication is given of truncation of bit values from the shifted source value. This is true whether the values truncated are 0 or 1.
The operation is performed such that the bit string of the source is considered to be extended on the left and right by an unlimited number of bit string positions of value 0. Additionally, a receiver bit string view (window) with the attributes of the receiver is considered to overlay this conceptual bit string value of the source starting at the leftmost bit position of the original source value. A left logical shift of the conceptual bit string value of the source is then performed relative to the receiver bit string view according to the shift criteria specified in the shift control operand. After the shift, the bit string value then contained within the receiver bit string view is copied to the receiver.
The source and the receiver can be either character or numeric. Any numeric operands are interpreted as logical character strings. Due to the operation being treated as a character string operation, the source operand may not be specified as a signed immediate operand. Additionally, for a source operand specified as an unsigned immediate value, only a 1-byte immediate value may be specified.
The shift control operand may be specified as an immediate operand, as a character(2) scalar, or as an unsigned binary(2) scalar. It provides an unsigned binary value indicating the number of bit positions for which the left logical shift of the source bit string value is to be performed. A zero value specifies no shift.
06 Addressing
08 Argument/Parameter
10 Damage Encountered
1C Machine-Dependent
20 Machine Support
22 Object Access
24 Pointer Specification
2E Resource Control Limit
32 Scalar Specification
36 Space Management
44 Protection Violation