HLASM - BPR = Branch on Plus Register

The opcode of the BPR extended mnemonic is X'07' with mask B'0010'.

The mask is the third hex digit of the instruction, and - though this is uncommon - can be regarded as the third hex digit of the opcode as well.

Usage

  1. Perform a branch if the condition code is 2 or B'10', meaning "plus" or "positive".
  2. Condition code 2 may occur after arithmetic operations, such as AR. Do not use after multiplication and division, since these instructions do not set the condition code.

Arguments

  1. Register holding the destination address.

Function

  1. The processor uses the PSW's two-bit condition code as an index into the 4-bit condition mask.
  2. If the selected mask-bit is one, then it branches to the address specified in the second argument. If the bit is zero, then the processor continues with the next instruction.
  3. The condition code does not change.

Special Cases

  1. If the destination address is in register 0 no branch will be taken.

Related Instructions

  1. BHR is a synonym for the BPR mnemonic.
  2. BP branches to a location that is directly addressable in base-displacement form.
  3. BCR is the real instruction associated with this extended mnemonic.

Hardware

  1. All hardware supports the BPR instruction.

Remarks

  1. The PSW's Amode setting determines how many bits are used for the destination address.

Examples

         YREGS                          * Define register names
         ...
         SR    R6,R1                    * Deduct from total
         BPR   R14                      * Left-over is more than zero!
         ...

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