Who contributed to Go on August 25, 2026?

8 developers shipped this update, including Guoqi Chen, XiaolinZhao, qiulaidongfeng, Alberto Donizetti, thepudds1460, Robert Griesemer, Jonathan Amsterdam, and cuishuang.

What were the notable Go updates?

cmd/compile: fix sign/zero-extension removal on loong64, crypto/internal/fips140/aes: add loong64 LSX assembly for AES block operations, and crypto/internal/fips140/aes: add loong64 LSX assembly for CTR mode.

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The Wire · Showcase

LOONG64 WINS BIG: GO SHRINKS BY 7128 INSTRUCTIONS

By RepoJournal · Filed 06:56 UTC on August 25, 2026 · About Go

8 people shipped this

Jonathan Amsterdam @jba 4 cited

XiaolinZhao @sophie-zhao 3 cited

Guoqi Chen @abner-chenc 1 cited

qiulaidongfeng @qiulaidongfeng 1 cited

thepudds1460 @thepudds 1 cited

Robert Griesemer @griesemer 1 cited

cuishuang @cuishuang 1 cited

Alberto Donizetti @ALTree

The Go team is rewriting the loong64 backend for performance, and the first patch alone removes 7128 instructions from the go binary.

A critical compiler fix for loong64 [1] moves extension-removal rules to late lower, preventing high-bit corruption and trimming 7,128 instructions from the go binary. Meanwhile, new LSX assembly for AES block operations [2] and CTR mode [3] bring hardware-free crypto acceleration to LoongArch, with CTR mode showing a 24.29% speedup on the Loongson 3C6000. CRC32 also gets a boost [4], with unrolled loops improving performance by 20.95%. On the language side, the flag package gains All iterators and Flag.IsSet [5], a long-awaited ergonomic improvement. The website desk is clarifying Go 1.27's jsonv2 GOEXPERIMENT changes [6] and retroactively documenting the removal of the tlkskyber GODEBUG flag [7]. Over on pkgsite, Jonathan Amsterdam is building a type equality engine [8] that will power breaking-change detection, now supporting functions [9], structs [10], and generics [11]. The release notes also promise changes to jsonv2 that "demonstrate these changes happen" for users upgrading to Go 1.27 [6]. Finally, modfile docs get fixed [12], pointing Cleanup to the right method.

Action items

→ Upgrade the Go toolchain to include the loong64 compiler fix (CL 568616) before your next cross-compile for loong64 golang/go [immediate]
→ Watch the pkgsite breakings work for early access to breaking-change detection in pkg.go.dev golang/pkgsite [monitor]
→ Review the jsonv2 GOEXPERIMENT changes if you're using it, they're documented for Go 1.27 golang/website [plan]

References

[1] cmd/compile: fix sign/zero-extension removal on loong64 golang/go
[2] crypto/internal/fips140/aes: add loong64 LSX assembly for AES block operations golang/go
[3] crypto/internal/fips140/aes: add loong64 LSX assembly for CTR mode golang/go
[4] hash/crc32: unroll loong64 CRC32 update loops to 32 bytes per iteration golang/go
[5] flag: add All iterators and Flag.IsSet golang/go
[6] _content/doc/go1.27: mention some changes to GOEXPERIMENT=jsonv2 in the release notes golang/website
[7] doc: retro-actively document removal of tlkskyber GODEBUG flag golang/website
[8] internal/breakings: type strings golang/pkgsite
[9] internal/breakings: type strings for functions golang/pkgsite
[10] internal/breakings: type strings for structs golang/pkgsite
[11] internal/breakings: type string for generic functions golang/pkgsite
[12] modfile: fix Cleanup and DropTool documentation golang/mod

Quick answers

What shipped in Go on August 25, 2026?: The Go team is rewriting the loong64 backend for performance, and the first patch alone removes 7128 instructions from the go binary. In total, 34 commits landed.
Who contributed to Go on August 25, 2026?: 8 developers shipped this update, including Guoqi Chen, XiaolinZhao, qiulaidongfeng, Alberto Donizetti, thepudds1460, Robert Griesemer, Jonathan Amsterdam, and cuishuang.
What were the notable Go updates?: cmd/compile: fix sign/zero-extension removal on loong64, crypto/internal/fips140/aes: add loong64 LSX assembly for AES block operations, and crypto/internal/fips140/aes: add loong64 LSX assembly for CTR mode.

KNOWNHOSTS REVOCATION GAP PATCHED

A revocation check in Go's crypto library silently let revoked host keys pass, and the fix is now in.

go 1 shipped

@golang Aug 23

GO RUNTIME FIXES A SUBTLE BODY-CLOSE BUG

The net/http change you didn't know you needed just landed, and it could save you from chasing a phantom io.EOF.

go 3 shipped

@golang Aug 22

GO CLEANUP: SPLITPHASE GONE, RISCV64 FASTER

Austin Clements tore out the last splitPhase scaffolding in Go's SIMD generators, and Joel Sing shaved 300 instructions off riscv64 binaries, all in a morning's work.

go 38 shipped

@golang Aug 21

GO'S SYNC.ONCE PANIC TRAP

A panic in go/parser's ResolveFile can leave the compiler silently skipping type resolution, and Damien Neil is closing a request smuggling hole in net/http.