Branch Mnemonic Opcodes Assembler Branch Instructions

Introduction

This document provides a summary of the extended mnemonic opcodes for branch instructions. This program may serve as a tutorial for programmers that are new to 370 assembler or as a reference for experienced programmers. In the following tables the leftmost three columns show the mnemonic with the operands and a brief description. The rightmost three columns show the instruction format, the actual mnemonic opcode and the mask and addressing format that is generated from the extended mnemonic.

Note:  D2=displacement, X2=index register, B2=base register, R2=register containing branch address

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Unconditional or No Branch

The following mnemonic opcodes are used for an Unconditional Branch or No Branch.

Branch After Compare Instruction

The following mnemonic opcodes are used after Compare Instructions.

Branch After Arithmetic Instruction

The following mnemonic opcodes are used after Arithmetic Instructions.

Branch After Test Under Mask

The following mnemonic opcodes are used after Test Under Mask Instructions.

Summary

This document provides a summary of the extended mnemonic opcodes for branch instructions. This document may be used to assist as a tutorial for new programmers or as a quick reference for experienced programmers.

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    Explore the Assembler Connection for more examples of mainframe Assembler programming techniques and sample code.

    Explore An Enterprise System Model that describes and demonstrates how Applications that were running on a Mainframe System and non-relational data that was located on the Mainframe System were copied and deployed in a Microsoft Windows environment with Micro Focus Enterprise Server.

    Explore The ASCII and EBCDIC Translation Tables. These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats.

    Explore The File Status Return Codes that are used to interpret the results of accessing VSAM data sets and/or QSAM files.

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Glossary of Terms

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