ARM DDI 0487B.a Copyright © 2013-2017 ARM Limited or its affiliates. All rights reserved. iii
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Apart from the exceptions listed in Limitations of issue B.a, the information in this document is final, that is for a developed
product.The exceptions have a Beta quality status, which means that they are work-in-progress.
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Limitations of issue B.a
This issue B.a of the ARMv8 Architecture Reference Manual contains many improvements and corrections. Validation of this
document has identified the following issues that ARM will address in future issues:
• The descriptions of the following architectural extensions are of beta quality and remain work in progress:
— The ARMv8.2 architectural extension.
—The Reliability, Availability, and Serviceability (RAS) Extension.
—The Scalable Vector Extension (SVE).
In descriptive text, beta-quality information is colored red to show that it is work-in-progress. This quality status applies
both to the colored text and to related content in pseudocode, in register descriptions, and in instruction descriptions that
relate to these features.
• The ARMv8.2 architectural extension also supports the following optional features that will be documented in a future
issue of this Manual:
— The Dot Product feature that provides support for
UDOT
and
SDOT
instructions.
— The Cryptographic feature that supports additional SHA and SM* cryptographic algorithms.
• In consultation with Architectural partners, ARM has changed the formal definition of the ARM memory model, and the
new definition forms part of this Manual. While this redefinition has a significant impact on the structure of the memory
model chapters, and on the conceptual framework and terminology used to describe the memory architecture, it has no
practical implications for implementations of the ARMv8-A architecture.
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