Assembler Macros: Simplifying Complex Operations on IBM z/OS

Authors: Chandra mouli Yalamanchili

DOI: https://doi.org/10.37082/IJIRMPS.v10.i2.232455

Short DOI: https://doi.org/

Country: USA

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Abstract: In the IBM z/OS environment, assembler programming remains essential for creating high-performance, low-level system software. Despite the assembler's perceived complexity, IBM's High-Level Assembler (HLASM) provides powerful constructs that enable developers to write modular, maintainable, and efficient code. One of the most critical constructs is the assembler macro facility, which allows repetitive or complex logic to be abstracted through reusable templates. [1]
This paper explores how assembler macros simplify complex operations by leveraging parameterization, conditional assembly, symbolic evaluation, and macro expansion strategies. Drawing heavily from IBM’s HLASM standards, this work provides a detailed guide to macro definitions, conditional branching constructs, symbolic handling techniques such as SETC, SETA, and SETB, and practical examples like looping macros that generate dynamic instruction sequences. [1]
This paper focuses on how these capabilities can be applied to modern mainframe applications, ensuring maintainable and high-performance assembler code within enterprise environments.

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Paper Id: 232455

Published On: 2022-04-06

Published In: Volume 10, Issue 2, March-April 2022

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