Who is this for?
This is an introductory topic for C/C++ developers who want to learn how to vectorize code using Arm SVE intrinsics, guided by an AI coding assistant connected to the Arm MCP server.
What will you learn?
Upon completion of this Learning Path, you will be able to:
- Optimize C code by learning from an AI assistant
- Establish a reproducible performance baseline for a scalar Adler-32 implementation written in C
- Apply the NMAX technique to defer modulo operations and improve scalar throughput
- Implement an SVE version of Adler-32 using svwhilelt, svdot, and svaddv
- Validate correctness and measure the performance improvement of the SVE implementation
Prerequisites
Before starting, you will need the following:
- An AI coding assistant configured with the Arm MCP server, such as Kiro CLI, GitHub Copilot, or Gemini CLI. For setup instructions, see the
Arm MCP server Learning Path
.
- An Arm Neoverse server running Ubuntu 26.04 with SVE support (for example, AWS Graviton3 or later, Google Axion, or Microsoft Cobalt 100)
- Basic familiarity with C programming
Summary
AI-assisted
This summary was drafted with an approved AI-assisted workflow and reviewed by Arm contributors before publication.
Human technical review remains part of the process so the final page reflects engineering rigor, accuracy, and Arm editorial standards.
You’ll transform a scalar Adler-32 checksum in C into a vector-length-agnostic SVE implementation on Arm Neoverse servers with help from an AI coding assistant connected to the Arm MCP server. First, you’ll set up a small project and capture a reproducible scalar baseline, then apply the NMAX technique to defer modulo operations and expose vectorization opportunities. You’ll learn core SVE concepts in context, including predication with svwhilelt, reductions with svaddv for the a accumulator, and building the b accumulator with svdot and weighted contributions. After each stage, you’ll validate correctness against the scalar version and measure performance changes.
Frequently asked questions
AI-assisted
These FAQs were drafted with an approved AI-assisted workflow and reviewed by Arm contributors before publication.
Human technical review remains part of the process so the final page reflects engineering rigor, accuracy, and Arm editorial standards.
Use an Arm Neoverse server with SVE support that matches the prerequisites. If in doubt, choose an instance class listed in the Learning Path, such as one based on AWS Graviton3 or later, and run the scalar baseline before writing SVE code.
What should I record for the baseline before starting vectorization?Capture the scalar Adler-32 checksum for a known input and record the timing you will compare against later. Keep the input size and conditions consistent so results are reproducible when you switch to the SVE version.
When applying the `NMAX` optimization, where should the modulo be performed?Defer the modulo operation and apply it after processing a block instead of on every byte. This reduces division work and removes the dependency that blocks vectorization of the inner loop.
Which parts of the Adler-32 loop should be vectorized first?Vectorize the a accumulator first because it maps cleanly to vector loads and a reduction with svaddv. Then handle the b accumulator using a weighted approach and svdot, as each element contributes differently within a block.
How should I handle data lengths that are not a multiple of the SVE vector length?Use a vector-length-agnostic loop with predication. Generate a predicate with svwhilelt and apply it to loads and arithmetic so tails are processed correctly on any SVE width.