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The Wire · Showcase

DEV.SIMD MERGES INTO 1.27, COMPILER OPTIMIZATIONS SHIP

By RepoJournal · Filed · About Go

Go's SIMD experiment landed in master overnight, bringing new WebAssembly operations and compiler improvements that will ship in Go 1.27.

The dev.simd branch merged back into master [1], completing a reverse merge that integrates months of SIMD work including new WebAssembly Swizzle operations [2]. This caps a multi-CL push that refactored how the compiler handles divide operations [3], removing special-case handling now that liftable ops are opt-in instead of opt-out. On the runtime side, the asynctimerchan GODEBUG setting was removed [4], cleaning up legacy experiment flags ahead of the 1.27 release. pkgsite got practical fixes: pgx upgraded from v4 to v5 in the queue system [5], API doc list formatting was restored [6], and a new vet command was added to all.bash for pre-push validation [7]. Telemetry expanded its tracking to capture GOEXPERIMENT values and all 49 supported ports including 2 broken ones [8], giving the team better visibility into how developers use experimental features across platforms. VulnDB added four new vulnerability reports in the system [9] [10] [11] [12], keeping the database current against emerging threats.

Action items

References

  1. [1] all: REVERSE MERGE dev.simd (0ac6a67) into master golang/go
  2. [2] [dev.simd] all: merge master (39c00b1) into dev.simd golang/go
  3. [3] cmd/compile: remove DIV special case golang/go
  4. [4] runtime: remove asynctimerchan GODEBUG setting golang/go
  5. [5] internal/queue: pgx/v4 to v5 golang/pkgsite
  6. [6] static/frontend/api/api.tmpl: fix list formatting golang/pkgsite
  7. [7] add vet command to all.bash golang/pkgsite
  8. [8] internal/chartconfig: add go/platform/target/port:*-* counter golang/telemetry
  9. [9] data/reports: add GO-2026-4945 golang/vulndb
  10. [10] data/reports: add GO-2026-4958 golang/vulndb
  11. [11] data/reports: add GO-2026-4985 golang/vulndb
  12. [12] data/reports: add GO-2026-5002 golang/vulndb

FAQ

What changed in Go on May 27, 2026?
Go's SIMD experiment landed in master overnight, bringing new WebAssembly operations and compiler improvements that will ship in Go 1.27.
What should Go teams do about it?
Review SIMD changes in dev.simd merge for any integration issues in your codebase • Update any internal tooling that references asynctimerchan GODEBUG before Go 1.27 ships • Run new vet command in pkgsite builds to catch issues early
Which Go repositories shipped on May 27, 2026?
golang/go, golang/pkgsite, golang/telemetry, golang/vulndb

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