The number of different ARM Instruction Set Architectures (ISA) versions has slowly increased, and Arm adds a new version every few years. The oldest ISA version in use today is ARMv6 with the ARMv6 ISA (ARM11) found in the original Raspberry Pi SBC and Raspberry Pi Zero (BCM2835). The ARMv6 ISA was introduced in 2002, followed by ARMv7 in 2005 (beginning of the Cortex-A series) and ARMv8 in 2011. The latter featured additional 64-bit support.

What notable features does ARMv9 bring to the table as ARMv7 is the first of the Cortex cores and ARMv8 adds 64-bit support in the form of AArch64? As announced earlier this yearARMv9 appears to be focused on adding a whole host of features with its Confidential Compute Architecture (CCA) designed to improve vector processing (vector extensions or SVE) as well as digital signal processing (DSP) and security.

In addition, ARMv9 includes all functions that were available with ARMv8.1, v8.2, v8.3 and …

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