--- title: "Go 1.27's portable SIMD" publication: "Go Weekly" issue: 619 published_at: "2026-09-25" canonical_url: "https://golangweekly.com/issues/619" --- Plus the tricky business of adding sum types, is FIPS bloating your Go binaries, Google's large-scale agent orchestrator, and a Go-powered search engine. #​619 β€” September 25, 2026 [Read the Web Version](https://golangweekly.com/issues/619) πŸ‘‹ We're taking a break next week, so we'll be back on Friday, October 9. __ _Your editor, Peter Cooper_ Together with [![Tiger Data logo\](https://res.cloudinary.com/cpress/image/upload/c_fill,g_auto,w_1280,h_282/e_make_transparent/co_white,e_outline:30/px1u7kjyvz7xnbm6ytir.png)](https://www.tigerdata.com/go/trial?utm_source=content-syndication&utm_medium=referral&utm_campaign=golang-weekly-newsletter) Go Weekly [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/hzrvmcdnr9leqzisyx0v.jpg)](https://go.dev/blog/simd-experiment) [Platform-Independent SIMD in Go](https://go.dev/blog/simd-experiment) β€” 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](https://github.com/golang/go/commit/64ec0fd899) 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](https://boyter.org/posts/would-you-kindly-search-without-index/) to help cut his code search tool's user CPU time by nearly 4x. - Sylvain Kerkour shows off [7.5x faster ChaCha20 encryption](https://kerkour.com/golang-chacha20-encryption-simd-archsimd) built on Go's SIMD. [![\](https://res.cloudinary.com/cpress/image/upload/c_limit,w_480,h_480,q_auto/copm/466f4e70.png)](https://www.tigerdata.com/go/trial?utm_source=content-syndication&utm_medium=referral&utm_campaign=golang-weekly-newsletter) [Ingest and Analytics in One Postgres. No Pipeline](https://www.tigerdata.com/go/trial?utm_source=content-syndication&utm_medium=referral&utm_campaign=golang-weekly-newsletter) β€” 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](https://www.tigerdata.com/go/trial?utm_source=content-syndication&utm_medium=referral&utm_campaign=golang-weekly-newsletter). Tiger Data (creators of TimescaleDB) sponsor πŸ“’ Proposals and Updates [How Do You Add a New Keyword to Go? (For Sum Types)](https://github.com/golang/go/issues/76920#issuecomment-5770498541) β€” Damien's [design for sum types](https://github.com/golang/go/issues/76920) 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.](https://github.com/golang/go/issues/76920#issuecomment-5821880580) Damien Neil et al. [Is Go's FIPS 140 Code Bloating Your Binaries?](https://github.com/golang/go/issues/81639) β€” 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](https://github.com/golang/go/issues/75047#issuecomment-5814956567) 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](https://github.com/golang/go/issues/3939#issuecomment-5814955677). - Brad Fitzpatrick is [prototyping `Mutex.LockChan()`](https://go.dev/cl/828544) 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](https://github.com/golang/go/issues/81657) to speed up the GC's stop-the-world phase transitions. πŸ›  Code & Tools [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/lwk51nrbc07sfha1dgtx.jpg)](https://agentexecutor.io/) [AX: Google's Open Agentic Orchestration Runtime](https://agentexecutor.io/) β€” 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](https://github.com/google/ax#readme). Jaana Dogan et al. [CodeAF: The Open-Source Software Factory for Open Models](https://agentfield.ai/github/codeaf/?utm_source=golang&utm_medium=newsletter&utm_campaign=golang-260925&utm_id=golang-260925-codeaf&utm_content=codeaf) β€” 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 πŸ”Ž [Hister: A Go-Powered Search Engine for Your Own Stuff](https://hister.org/) β€” The [creator of SearX](https://hister.org/posts/lessons-i-learned-from-creating-searx) (and [Colly](https://github.com/gocolly/colly)) is back with a self-hosted personal search engine for re-finding your files or pages you’ve visited. [GitHub repo](https://github.com/asciimoo/hister). Adam Tauber [RobotGo 1.1: Native Cross-Platform GUI Automation](https://github.com/go-vgo/robotgo) β€” 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](https://github.com/nats-io/nats-server/releases/tag/v2.15.0) – High-performance messaging system. There's [an upgrade guide](https://docs.nats.io/release-notes/upgrade-to-2.15) 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](https://github.com/gruntwork-io/terratest/releases/tag/modules/core/v2.0.0) – 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](https://terratest.gruntwork.io/).) - [garble 0.18](https://github.com/burrowers/garble/releases/tag/v0.18.0) – 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](https://github.com/klauspost/compress/releases/tag/v1.20.0) – Optimized (de)compression packages, now with support for LZW and Microsoft Xpress. - πŸ€– [Crush 0.96](https://github.com/charmbracelet/crush/releases/tag/v0.96.0) – Charm's agentic coding harness now has themes! ⭐ And finally… [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/j7asalvv3zbqyagi86qq.jpg)](https://tinygo.org/blog/2026/tinygo-starter-kit-with-xiao/) [The First Official TinyGo Hardware 'Starter Kit'](https://tinygo.org/blog/2026/tinygo-starter-kit-with-xiao/) β€” If you want to do some hardware hacking with [TinyGo](https://tinygo.org/), this official kit includes a RISC-V board and a variety of modules, along with [tutorials](https://github.com/soypat/tinygo-seeed-grove) 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](https://tinygo.org/docs/reference/microcontrollers/featured/) and [supported boards](https://tinygo.org/docs/reference/microcontrollers/boards/) you can use. TinyGo Team and Seeed Studio Curated by Peter Cooper and [Glenn Goodrich](https://twitter.com/ruprict). Go is a [trademark of Google](https://go.dev/brand). The [Go gopher](https://go.dev/blog/gopher), whenever used, is an original creation by RenΓ©e French. [Change your email](https://golangweekly.com/edit_subscription/*|UID|*) [Stop getting this newsletter](https://golangweekly.com/leave/*|UID|*) Β© Cooper Press Ltd Β· Fairfield Enterprise Centre, Louth, LN11 0LS, United Kingdom