new(go.dev/dev-simd): Go toolchain from the dev.simd branch (SIMD intrinsics)#13169
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tannevaled wants to merge 1 commit into
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new(go.dev/dev-simd): Go toolchain from the dev.simd branch (SIMD intrinsics)#13169tannevaled wants to merge 1 commit into
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…rinsics) Builds Go from upstream's experimental `dev.simd` branch (targeting Go 1.27), which adds the `simd/archsimd` package — portable SIMD intrinsics written in plain Go (no cgo, no hand-written assembly) that lower to AVX2/AVX-512 on amd64 and NEON on arm64. Why: `simd/archsimd` isn't in a released Go yet — amd64 shipped in 1.26 behind GOEXPERIMENT=simd, but arm64 (NEON) only exists on `dev.simd` (slated for 1.27). This lets you build/benchmark SIMD Go today on both amd64 and arm64, from a pinned commit. Details: - Sub-package of go.dev (alongside go.dev/govulncheck, go.dev/testscript). - Pinned-commit snapshots of a tagless branch, versioned by the commit's committer date as CalVer (YYYY.M.D.HH.MM.SS); `distributable: ~` + a version->SHA case in build.script fetches the exact commit. First version 2026.6.1.17.4.35 = commit 0e5948dc. - No `provides:`/`interprets:` on purpose: it ships bin/go like go.dev, so it must not claim the bare `go`/`gofmt` commands or the `.go` interpreter. pkgx has no conflicts field; the mutual exclusion is to use it explicitly via `pkgx +go.dev/dev-simd`. - README renders on pkgx.dev (rationale, usage, versioning, caveats). Verified: `bk build` + `bk audit` pass; the built toolchain reports go1.27 and `GOEXPERIMENT=simd go run` of a `simd/archsimd` program works, incl. NEON Uint32x4 on darwin/arm64. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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What
Adds
go.dev/dev-simd: the Go toolchain built from upstream Go's experimentaldev.simdbranch (targeting Go 1.27), which provides thesimd/archsimdpackage — portable SIMD intrinsics written in plain Go (no cgo, no hand-written assembly) that the compiler lowers to AVX2/AVX-512 on amd64 and NEON on arm64.Why
simd/archsimdisn't in a released Go yet: amd64 shipped in Go 1.26 behindGOEXPERIMENT=simd, but arm64 (NEON) only exists ondev.simd(slated for 1.27). This package lets people build/benchmark SIMD Go today on both amd64 and Apple-Silicon/arm64, reproducibly from a pinned commit, before 1.27 lands.How it's structured
go.dev(alongsidego.dev/govulncheck,go.dev/testscript).YYYY.M.D.HH.MM.SS).distributable: ~+ aversion → SHAcase inbuild.scriptfetches the exact commit. First version2026.6.1.17.4.35= commit0e5948dc. (The archive has no.git/VERSION, so aVERSIONis synthesized forcmd/dist.)provides:/interprets:on purpose: it shipsbin/golikego.dev, so it must not claim the barego/gofmtcommands or the.gointerpreter. Used explicitly:pkgx +go.dev/dev-simd -- go ….Verified
bk buildandbk auditpass. The built toolchain reportsgo1.27, andGOEXPERIMENT=simd go runof asimd/archsimdprogram works — including NEONUint32x4ondarwin/arm64.Note for maintainers
This packages a snapshot of a moving pre-release dev branch, not a tagged Go release — flagging that explicitly so you can decide whether it fits the pantry's scope. It is experimental (the
simdpackage is outside the Go 1 compatibility promise) and opt-in (no command shadowing). Happy to adjust naming/structure, restrict platforms, or close if it's out of scope.🤖 Generated with Claude Code