HLASM - NOPR = No-OPeration Register

The opcode of the NOPR extended mnemonic is X'07' with mask B'0000'.

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. Fill up empty or reserved space in a program.

Arguments

  1. A register - holding a branch-to address that will not be used.

Function

  1. The processor does nothing, and continues with the next instruction.
  2. The condition code does not change.

Special Cases

  1. None.

Related Instructions

  1. NOP is the equivalent four-byte instruction.
  2. BCR is the real instruction associated with this extended mnemonic.

Hardware

  1. All hardware supports the NOPR instruction.

Remarks

  1. None.

Examples

         YREGS                          * Define register names
         ...
         NOPR  R0                       * Space for zap or hook
         ...

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