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wire 2026-09-02
stories 25
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$ the-wire · showcase

Go compiler drops unnecessary riscv64 masking and hardens SIMD codegen

By RepoJournal · Filed · About Go

Junyang Shao Joel Sing qmuntal Jorropo Mikhail Savin racequite Michael Pratt
7 people shipped this
Junyang Shao @JunyangShao 2 cited Joel Sing @4a6f656c 1 cited qmuntal @qmuntal 1 cited Jorropo @Jorropo 1 cited Mikhail Savin @savinmikhail 1 cited racequite @racequite 1 cited Michael Pratt @prattmic 1 cited

Go's compiler removes redundant shifts on riscv64 and stops SIMD zeros from implying AVX support, tightening codegen correctness on older CPUs.

A riscv64 compiler change eliminates unnecessary masking of shift operands [1] since shift instructions use only the lower six bits, or five for word operations. A separate fix prevents no-code SIMD values from implying CPU features [2]: a SIMD-typed zero, materialized as the all-zeros register X15, no longer forces AVX requirements in blocks that must run without AVX. The induction-variable min limit logic also now applies in dominated blocks [3], benefiting SIMD-unrolled loops with scalar tails. cmd/go's goauth_git test isolates itself from system Git credential helpers [4], fixing a 349-second timeout where inherited helpers blocked credential fills. The website documents GOAUTH for private module proxies [5], covering custom headers and HTTPS-only behavior, and screentest now rejects negative retrypixels values [6], which previously became math.MaxUint64. Go 1.26.8 and 1.27.1 are documented in history [7]. The known-bits pass also removes no-op ORs [8] where one argument is fully shadowed, catching cases prove misses.

Action items

References

  1. [1] cmd/compile/internal/ssa: remove unnecessary masking with shifts on riscv64 ↗ golang/go
  2. [2] cmd/compile: don't let no-code SIMD values imply CPU features ↗ golang/go
  3. [3] cmd/compile: make indvar min limit visible in its block ↗ golang/go
  4. [4] cmd/go: isolate goauth_git from system credential helpers ↗ golang/go
  5. [5] _content/ref/mod: document GOAUTH for private module proxies ↗ golang/website
  6. [6] cmd/screentest: reject negative retrypixels values ↗ golang/website
  7. [7] internal/history: document Go 1.26.8 and 1.27.1 ↗ golang/website
  8. [8] cmd/compile: teach known bits to remove no-op or ↗ golang/go

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

the week in review crypto/ssh CheckCert enforces source address the month in review Go compiler hardens binaries, crypto tightens SSH safety
Topics: Go Infrastructure Full archive →

Quick answers

What shipped in Go on September 2, 2026?
Go's compiler removes redundant shifts on riscv64 and stops SIMD zeros from implying AVX support, tightening codegen correctness on older CPUs. In total, 25 commits landed.
Who contributed to Go on September 2, 2026?
7 developers shipped this update, including Joel Sing, Junyang Shao, qmuntal, Jorropo, Mikhail Savin, racequite, and Michael Pratt.
What were the notable Go updates?
cmd/compile/internal/ssa: remove unnecessary masking with shifts on riscv64, cmd/compile: don't let no-code SIMD values imply CPU features, and cmd/compile: make indvar min limit visible in its block.
♥

$ log @golang --recent

crypto/x509 tightens URI and email name constraint matching 5 shipped crypto/tls frees pinned buffers, compiler tail call DCE fix lands 26 shipped Plugin itabs double-inserted; symbol insertion skips large modules 12 shipped x/tools protocol shift, masked heap prefix fix 31 shipped

$ log --all # elsewhere on the wire

Meta React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints

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