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ARMv9.3-A Instruction Set: what it is, how it works and what it does

The ARMv9.3-A instruction set is a technical specification of the ARM architecture that defines the repertoire of operations and processor behavior. It represents a specific iteration within the ARMv9 family, establishing compatibility and functionality parameters for hardware and software that implement it.

Evidence-backed content 6 sources 15/09/2026
Encyclopedic article

Definition and Scope

The ARMv9.3-A instruction set is a formal specification that defines the repertoire of operations, state model, and execution rules for processors based on the ARM architecture. This designation identifies a specific version within the ARMv9 development line, serving as a technical reference for hardware and software compatibility.

Architecture and Principles

The ARMv9.3-A architecture is part of the evolution of ARM's 64-bit instructions. Its fundamental principles include:

  • Backward compatibility: As an extension of the ARMv9 family, it maintains compatibility with instructions defined in previous versions of the v9 series, allowing the execution of legacy software.
  • Repertoire definition: Establishes which instructions are valid, how they are decoded, and what effects they have on registers and processor state.
  • Behavior specification: Defines execution rules, including exception handling, memory coherence, and privilege management.

Applications and Interpretation in Products

The presence of the ARMv9.3-A label in a product's specification indicates that the processor implements this specific level of the architecture. This has the following implications:

  1. Software support: Compilers and operating systems can generate code optimized for the specific features of this version, provided they do not require instructions from later versions (such as ARMv9.4 or higher).
  2. Hardware validation: Allows developers to verify that the hardware meets the minimum functionality requirements defined by this specification.
  3. Technical positioning: Serves as a marker of maturity and functionality within the range of ARM processors, differentiating it from earlier or later versions.

Limitations

As a specification for a specific version, the ARMv9.3-A instruction set does not include extensions or improvements introduced in later versions of the ARM architecture. Software that relies on instructions exclusive to newer versions will not be compatible with hardware that only implements ARMv9.3-A.

Note: The exact specification of additional instructions or modifications relative to ARMv9.2-A should be consulted in the official ARM architecture documentation for complete technical details.