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wire 2026-07-31
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RISCV64 COMPILER BUG BREAKS UNSIGNED VALUE HANDLING

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

cuishuang Jonathan Amsterdam Jorropo Egon Elbre Mauri de Souza Meneguzzo Erik Staab Daniel Morsing
7 people shipped this
cuishuang @cuishuang 3 cited Jonathan Amsterdam @jba 2 cited Jorropo @Jorropo 1 cited Egon Elbre @egonelbre 1 cited Mauri de Souza Meneguzzo @mauri870 1 cited Erik Staab @erikus 1 cited Daniel Morsing @DanielMorsing

Go's compiler is silently corrupting unsigned integer sign extensions on RISCV64, a critical correctness issue that requires immediate attention across the platform.

The riscv64 lowering rules remove sign extensions after 32-bit instructions, but regalloc restores spilled values with an extension chosen from their type: unsigned 4-byte values are restored zero-extended, losing the sign extension the rules removed [1]. This cascades across multiple fronts. The compiler is also missing opcode coverage in ZeroUpper32Bits, letting redundant zero-extensions slip through on amd64 and arm64 [2]. A separate OpenBSD/RISCV64 breakage from a recent stack check addition needs removal [3]. Beyond core compiler fixes, the release covers quality-of-life improvements: dark mode support for net/http directory listings [4], iOS version parsing that handles three-component versions like 13.1.1 [5], and test infrastructure cleanup across pkgsite [6], [7]. The present tool got two fixes for directive validation and documentation accuracy [8], [9]. 18 commits across 4 repos shipped in this period.

Action items

References

  1. [1] cmd/compile: do not elide riscv64 sign extension of unsigned values ↗ golang/go
  2. [2] cmd/compile/internal/ssa: complete ZeroUpper*Bits opcode coverage ↗ golang/go
  3. [3] runtime: remove stackcheck from openbsd/riscv64 ↗ golang/go
  4. [4] net/http: support dark mode in dir listing ↗ golang/go
  5. [5] cmd/gomobile: support three-component iOS versions ↗ golang/mobile
  6. [6] internal/frontend: doc signal: clean up tests ↗ golang/pkgsite
  7. [7] internal/frontend: doc signal: more test reorg ↗ golang/pkgsite
  8. [8] present: validate background directive arguments ↗ golang/tools
  9. [9] present: correct documented time for dates ↗ golang/tools

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

the week in review Go 1.27.1 lands as plan9 early export disabled the month in review Go compiler hardens binaries, crypto tightens SSH safety
Topics: Go Infrastructure Full archive → Weekly reviews →

Quick answers

What shipped in Go on July 31, 2026?
Go's compiler is silently corrupting unsigned integer sign extensions on RISCV64, a critical correctness issue that requires immediate attention across the platform. In total, 18 commits landed.
Who contributed to Go on July 31, 2026?
7 developers shipped this update, including Jorropo, Egon Elbre, Mauri de Souza Meneguzzo, Erik Staab, Daniel Morsing, cuishuang, and Jonathan Amsterdam.
What were the notable Go updates?
cmd/compile: do not elide riscv64 sign extension of unsigned values, cmd/compile/internal/ssa: complete ZeroUpper*Bits opcode coverage, and runtime: remove stackcheck from openbsd/riscv64.
♥

$ log @golang --recent

Salsa20 gets a loong64 SIMD path 1 shipped LoongArch crypto gets SIMD, RISC-V bit tests slim down 9 shipped Go's QUIC stack learns to tell on-path from off-path, and amd64 gets v2/v3/v4 CPU bits 19 shipped pkgsite drops ctxhttp, tour returns real 404s 7 shipped

$ log --all # elsewhere on the wire

@open-webui Open WebUI 0.11.4 ships a slim image 89% smaller FastAPI & Pydantic SQLModel narrows SQLAlchemy type handling in Field, drops dataclass_transform shim

$ ls showcases/

Rails Django Laravel Node.js Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic OpenAI

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