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Announced in October 2011, Armv8-A (often called ARMv8 while the Armv8-R is also available) represents a fundamental change to the ARM architecture. It adds an optional 64-bit architecture named "AArch64" and the associated new "A64" instruction set.
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ARMv8-A. This is a table of 64 /32-bit central processing...
- Reduced Instruction Set Computer
- Aarch64 Features
- V8.1-A
- V8.2-A
- V8.3-A
- V8.4-A
- V8.5-A and Armv9.0-A
- V8.6-A and Armv9.1-A
- V8.7-A and Armv9.2-A
- V8.8-A and Armv9.3-A
New instruction set, A64:Advanced SIMD (Neon) enhanced:A new exception system:Memory translation from 48-bit virtual addresses based on the existing Large Physical Address Extension (LPAE), which was designed to be easily extended to 64-bit.In December 2014, ARMv8.1-A,an update with "incremental benefits over v8.0", was announced. The enhancements fell into two categories: changes to the instruction set, and changes to the exception model and memory translation. Instruction set enhancements included the following: 1. A set of AArch64 atomic read-write instructions. 2. Additions to the...
In January 2016, ARMv8.2-A was announced.Its enhancements fell into four categories: 1. Optional half-precision floating-pointdata processing (half-precision was already supported, but not for processing, just as a storage format.) 2. Memory model enhancements. 3. Introduction of Reliability, Availability and Serviceability Extension(RAS Extension)...
In October 2016, ARMv8.3-A was announced. Its enhancements fell into six categories: 1. Pointer authentication (AArch64 only); mandatory extension (based on a new block cipher, QARMA) to the architecture (compilers need to exploit the security feature, but as the instructions are in NOP space, they are backwards compatible albeit providing no extra...
In November 2017, ARMv8.4-A was announced. Its enhancements fell into these categories: 1. "SHA3 / SHA512 / SM3 / SM4crypto extensions." 2. Improved virtualization support. 3. Memory Partitioning and Monitoring (MPAM) capabilities. 4. A new Secure EL2 state and Activity Monitors. 5. Signed and unsigned integer dot product(SDOT and UDOT) instruction...
In September 2018, ARMv8.5-A was announced. Its enhancements fell into these categories: 1. Memory Tagging Extension (MTE) (AArch64). 2. Branch Target Indicators (BTI) (AArch64) to reduce "the ability of an attacker to execute arbitrary code". Like pointer authentication, the relevant instructions are no-ops on earlier versions of ARMv8-A. 3. Rando...
In September 2019, ARMv8.6-A was announced. Its enhancements fell into these categories: 1. General Matrix Multiply (GEMM). 2. Bfloat16 formatsupport. 3. SIMD matrix manipulation instructions, BFDOT, BFMMLA, BFMLAL and BFCVT. 4. Enhancements for virtualization, system management and security. 5. And the following extensions (that LLVM 11 already ad...
In September 2020, ARMv8.7-A was announced. Its enhancements fell into these categories: 1. Scalable Matrix Extension (SME)(ARMv9.2 only). SME adds new features to process matrices efficiently, such as: 1.1. Matrix tile storage. 1.2. On-the-fly matrix transposition. 1.3. Load/store/insert/extract tile vectors. 1.4. Matrix outer product of SVE vecto...
In September 2021, ARMv8.8-A and ARMv9.3-A were announced. Their enhancements fell into these categories: 1. Non-maskable interrupts (AArch64). 2. Instructions to optimize memcpy() and memset() style operations (AArch64). 3. Enhancements to PAC (AArch64). 4. Hinted conditional branches (AArch64). LLVM15 supports ARMv8.8-A and ARMv9.3-A.
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Armv8-A. The Armv8-A architecture introduces the ability to use 64-bit and 32-bit Execution states, known as AArch64 and AArch32 respectively. The AArch64 Execution state supports the A64 instruction set. It holds addresses in 64-bit registers and allows instructions in the base instruction set to use 64-bit registers for their processing.
Dec 2, 2014 · ARMv8.1 is the first set of changes that ARM is introducing to the latest version of its ARMv8 A-profile architecture, grouped to help the ecosystem manage tools and software support alongside the large numbers of ARMv8-A based processors and products in development or production today.
Apr 6, 2017 · Version 8.2-A includes enhanced memory model, half-precision floating point data processing and introduces both RAS (reliability availability serviceability) support and statistical profiling extension (SPE). Read the new v8.2-A documentation on Arm Developer.
Armv8-A was a major milestone for Arm. Up to and including Armv7-A/R, the Arm architecture was a 32-bit architecture. Armv8-A is a 64-bit architecture, although it still supports 32 -bit execution to provide backwards compatibility for legacy software (for example, v7, v6, and v5).
