Go 1.27's portable SIMD

#​619 — September 25, 2026

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👋 We're taking a break next week, so we'll be back on Friday, October 9.
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Your editor, Peter Cooper

Go Weekly

Platform-Independent SIMD in Go — SIMD lets a CPU perform an operation on a vector of values at once. Go 1.27 brings experimental SIMD support to arm64 and wasm, plus a portable simd package that emulates SIMD where unavailable, so you don't need to write a plain Go fallback.

David Chase and Junyang Shao (Go Team)

RELATED:

• hash/adler32's SIMD implementation is a good, brief example of using SIMD to get over double the speed on larger inputs.
• Ben Boyter explains how he borrowed fzf's SIMD byte-matching routine to help cut his code search tool's user CPU time by nearly 4x.
• Sylvain Kerkour shows off 7.5x faster ChaCha20 encryption built on Go's SIMD.

Ingest and Analytics in One Postgres. No Pipeline — Go compiles to one binary. Your data layer can be just as lean. TimescaleDB extends the Postgres you already run so ingest and analytics live in one database, not a warehouse and a pipeline. Same SQL, one system to run. Get $1000 credit to start.

Tiger Data (creators of TimescaleDB) sponsor

📢 Proposals and Updates

How Do You Add a New Keyword to Go? (For Sum Types) — Damien's design for sum types is being actively worked through. The latest sticking point is figuring out how to add a union keyword without breaking existing code or gofmt, with some useful input from Dart's Bob Nystrom.

Damien Neil et al.

Is Go's FIPS 140 Code Bloating Your Binaries? — Using crypto/rand pulls in extra crypto code even with FIPS off, so WireGuard's creator wants a build-time opt-in. Filippo Valsorda has trimmed some dependencies but argues separate builds would increase testing and maintenance work.

Jason A. Donenfeld et al.

AND MORE:

• Tests are getting automatic goroutine labels so profiles and tracebacks show which test, benchmark or fuzz run was responsible.
• string(x) on arbitrary integers will be restricted to byte, rune, and untyped rune constants in Go 1.28, with the proposal being accepted yesterday.
• Brad Fitzpatrick is prototyping Mutex.LockChan() so a select can wait on a lock and a channel at once. Just a demo for now.
• Rhys Hiltner has a stack of CLs to speed up the GC's stop-the-world phase transitions.

🛠 Code & Tools

AX: Google's Open Agentic Orchestration Runtime — Designed for large-scale throughput, AX runs AI agents akin to how Kubernetes runs pods. Declare tasks, workspaces, and models in YAML and AX sandboxes the agents and wires it all up. GitHub repo.

Jaana Dogan et al.

CodeAF: The Open-Source Software Factory for Open Models — Instead of juggling a terminal for every agent, get one window for every project. Many models, one session: the right one for each call.

AgentField.ai sponsor

🔎 Hister: A Go-Powered Search Engine for Your Own Stuff — The creator of SearX (and Colly) is back with a self-hosted personal search engine for re-finding your files or pages you’ve visited. GitHub repo.

Adam Tauber

RobotGo 1.1: Native Cross-Platform GUI Automation — Provides an API to control the mouse and keyboard, read the screen, grab screenshots, etc. on macOS, Windows, and Linux.

V Caesar et al.

• NATS Server 2.15 – High-performance messaging system. There's an upgrade guide for existing users. JetStream stream moves and scaling are now safer to cancel mid-flight, and streams default to a limit of 1,000 consumers.
• Terratest 2.0 – Write automated tests for your infrastructure code (think Terraform, Kubernetes, Docker, etc). Now split into 16 modules so you only pull in the SDKs you need. (Homepage.)
• garble 0.18 – A tool to obfuscate Go builds so binaries have "as little information about the original source code as possible". Now requires Go 1.27, with 10-15% faster builds.
• compress 1.20 – Optimized (de)compression packages, now with support for LZW and Microsoft Xpress.
• 🤖 Crush 0.96 – Charm's agentic coding harness now has themes!

⭐ And finally…

The First Official TinyGo Hardware 'Starter Kit' — If you want to do some hardware hacking with TinyGo, this official kit includes a RISC-V board and a variety of modules, along with tutorials for building stuff with it. If you’ve already got some boards or want to source your own, TinyGo also has a list of recommended and supported boards you can use.

TinyGo Team and Seeed Studio