Introducing Neon for Armv8-A

迷南。 2023-01-02 01:17 152阅读 0赞

# **Introducing Neon for Armv8-A** #

## 1. Overview ##

## 2. Before you begin ##

## 3. Data processing methodologies ##

## 4. Fundamentals of Armv8 Neon technology ##

Armv8-A includes both `32-bit and 64-bit Execution states`, each with their own instruction sets:  
Armv8-A 包括 32-bit and 64-bit 执行状态，每个状态都有自己的指令集：

*  AArch64 is the name used to describe the 64-bit Execution state of the Armv8-A architecture.  
    In AArch64 state, the processor executes the A64 instruction set, which contains Neon instructions (also referred to as SIMD instructions). GNU and Linux documentation sometimes refers to AArch64 as ARM64.
 *  AArch32 describes the 32-bit Execution state of the Armv8-A architecture, which is almost identical to Armv7.  
    In AArch32 state, the processor can execute either the A32 (called ARM in earlier versions of the architecture) or the T32 (Thumb) instruction set. The A32 and T32 instruction sets are backwards compatible with Armv7, including Neon instructions.

This guide will focus on Neon programming using A64 instructions for the `AArch64 Execution state` of the `Armv8-A architecture`.  
本指南将重点介绍针对 Armv8-A 架构的 AArch64 执行状态使用 A64 指令进行 Neon 编程。

If you want to write Neon code to run in the `AArch32 Execution state` of the `Armv8-A architecture`, you should refer to version 1.0 of the `Neon Programmer's Guide`.  
如果要编写 Neon 代码以在 Armv8-A 架构的 AArch32 执行状态下运行，则应参考 Neon Programmer’s Guide 的 1.0 版。

## 5. Check your knowledge ##

## 6. Related information ##

## 7. Next steps ##

single page - multiple pages

## References ##

Introducing Neon for Armv8-A - single page  
[https://developer.arm.com/architectures/instruction-sets/simd-isas/neon/neon-programmers-guide-for-armv8-a/introducing-neon-for-armv8-a/single-page][https_developer.arm.com_architectures_instruction-sets_simd-isas_neon_neon-programmers-guide-for-armv8-a_introducing-neon-for-armv8-a_single-page]

[https_developer.arm.com_architectures_instruction-sets_simd-isas_neon_neon-programmers-guide-for-armv8-a_introducing-neon-for-armv8-a_single-page]: https://developer.arm.com/architectures/instruction-sets/simd-isas/neon/neon-programmers-guide-for-armv8-a/introducing-neon-for-armv8-a/single-page