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Coding for Neon - Part 5: Rearranging Vectors

Martyn
This article describes the instructions provided by Neon for rearranging data within vectors. Previous articles in this series:
In…
- over 6 years ago
- Processors
- Processors blog
Coding for Neon - Part 4: Shifting Left and Right

Martyn
Chinese Version 中文版：NEON编码 - 第4部分: 左右移位

This article introduces the shifting operations provided by Neon, and shows how they can be used to convert image data between commonly used color depths.

Previous articles in this series:

Part 1: Loads and S…
- Processors
- Processors blog
Coding for Neon - Part 3: Matrix Multiplication

Martyn

In part 1 of this series we dealt with how to load and store data with NEON, and part 2 involved how to handle the leftovers resulting from vector processing. Let us move on to doing some useful data processing - multiplying matrices.

Matrices

In this…
- matrix_asm_sched.s.txt.zip
- over 6 years ago
- Processors
- Processors blog
Coding for Neon - Part 2: Dealing With Leftovers

Martyn

In part 1 of this series on Neon about loads and stores we looked at transferring data between the Neon processing unit and memory. In this post, we deal with an often encountered problem: input data that is not a multiple of the length of the vectors…
- over 6 years ago
- Processors
- Processors blog
What is arrangement specifier(.16b,.8b) in ARM assembly language instructions?

surajrgupta

I want to what exactly is arrangement specifier in arm assembly instructions.

I have gone through ARM TRMs and i think if it is size of Neon register that will be used for computation

for e.g. TBL Vd.Ta, {Vn.16B,Vn+1.16B }, Vm.Ta

they mentioned Ta to…
- 10 months ago
- Processors
- Cortex-A / A-Profile forum
No segmentation fault when expected with aligned load and store

aketh

Hi all,

It is a well known fact that performing an aligned vector load with an unaligned memory address should lead to segmentation fault.

However, when I do try to run code segment below using the same, i do not see any segmentation fault.

---------…
- over 1 year ago
- Processors
- Cortex-A / A-Profile forum
Coding for Neon - Part 1: Load and Stores

Martyn

Arm's Neon technology is a 64/128-bit hybrid SIMD architecture designed to accelerate the performance of multimedia and signal processing applications, including video encoding and decoding, audio encoding and decoding, 3D graphics, speech and image…
- over 6 years ago
- Processors
- Processors blog