ARMv80A

ARMv80A is an instruction set architecture (ISA) for 64-bit ARM processors. It was introduced by ARM Holdings in 2011. ARMv80A represents a significant evolution from previous ARM architectures, primarily by introducing a 64-bit execution state. This allows for a larger address space and improved performance for demanding applications.

The ARMv80A architecture is divided into two main execution states: AArch64 and AArch32. AArch64 is the 64-bit state, designed for modern 64-bit operating systems and applications. It features a new set of instructions and registers optimized for 64-bit operations. AArch32, on the other hand, is a 32-bit state that maintains backward compatibility with older ARMv7-A based software. This dual-state capability allows systems to seamlessly run both 32-bit and 64-bit code.

Key features introduced with ARMv80A include a redesigned memory model, enhanced security features such as TrustZone extensions, and improved floating-point and SIMD capabilities. These advancements have made ARMv80A a popular choice for a wide range of devices, from servers and laptops to smartphones and embedded systems. The widespread adoption of ARMv80A has been a driving force behind the increasing performance and efficiency of modern computing devices.