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wire 2026-08-22
stories 38
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$ the-wire · showcase

GO CLEANUP: SPLITPHASE GONE, RISCV64 FASTER

By RepoJournal · Filed · About Go · Composed from the cited sources · methodology

Austin Clements Hongxiang Jiang Joel Sing Joe Tsai Damien Neil racequite Gopher Robot
8 people shipped this
Austin Clements @aclements 3 cited Hongxiang Jiang @h9jiang 2 cited Joel Sing @4a6f656c 1 cited Joe Tsai @dsnet 1 cited Damien Neil @neild 1 cited racequite @racequite 1 cited Gopher Robot @gopherbot 1 cited Hajime Hoshi @hajimehoshi

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.

The Go compiler toolchain is getting leaner. Austin Clements removed the splitPhase vestiges from three SIMD generators [1][2][3], a cleanup that marks the end of the incremental SSA package split and simplifies the code generation pipeline. Meanwhile, Joel Sing's riscv64 optimization [4] avoids zero extension after a sufficient logical right shift, removing around 300 instructions from the Go binary. Over in vulndb, GO-2026-5026 gained attribution [5] after Damien Neil acknowledged the initial fix was insufficient. The mobile team forced a go directive bump to at least 1.26.0 [6] since Go 1.25 is now unsupported, and gobind added an -overlay flag [7] to keep generated bindings consistent with overlaid source. Telemetry now tracks the 'implement at cursor' command [8], while vscode-go users will need to adjust to new LSP log handling [9] after the language client library update. The docs also dropped the 'anonymous' term for embedded fields in encoding/json [10], a long-overdue modernization.

Action items

References

  1. [1] simd/archsimd/_gen/wasmgen: drop splitPhase vestiges ↗ golang/go
  2. [2] simd/archsimd/_gen/simdgen: drop splitPhase vestiges ↗ golang/go
  3. [3] simd/archsimd/_gen/tmplgen: drop splitPhase vestiges ↗ golang/go
  4. [4] cmd/compile: avoid zero extension when sufficiently shifted on riscv64 ↗ golang/go
  5. [5] data/reports/GO-2026-5026: add additional attribution ↗ golang/vulndb
  6. [6] all: upgrade go directive to at least 1.26.0 [generated] ↗ golang/mobile
  7. [7] cmd/gobind: support source overlays ↗ golang/mobile
  8. [8] internal/chartconfig: add telemetry for implement at cursor command ↗ golang/telemetry
  9. [9] CHANGELOG.md: document the step to enable lsp logs from vscode ↗ golang/vscode-go
  10. [10] encoding/json: use embedded terminology ↗ golang/go

$ ls golang/reviews/ # the step-back reads

the week in review FIPS 140 crypto fixes land across SHA-3, TLS 1.2, HKDF the month in review Go toolchain patches three CVEs as gopls hits v0.24.0
Full archive → Weekly reviews →

Quick answers

What shipped in Go on August 22, 2026?
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. In total, 38 commits landed.
Who contributed to Go on August 22, 2026?
8 developers shipped this update, including Austin Clements, Joel Sing, Joe Tsai, Damien Neil, Hongxiang Jiang, racequite, Gopher Robot, and Hajime Hoshi.
What were the notable Go updates?
simd/archsimd/_gen/wasmgen: drop splitPhase vestiges, simd/archsimd/_gen/simdgen: drop splitPhase vestiges, and simd/archsimd/_gen/tmplgen: drop splitPhase vestiges.
♥

$ log @golang --recent

RISC-V Zfa assembly support, and a faster archsimd unifier 9 shipped Plan 9 Mkdir race fixed, riscv64 gets clobberdead mode 7 shipped gopls closes a CVE on dash-prefixed module paths, and the exp collections get a Set 52 shipped Compiler stops lifting unsafe.Pointer arithmetic 35 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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