$ the-wire · showcase
Mach-O linking fix on Darwin ARM64, and a 2.7x SGEMM baseline
By RepoJournal · Filed · About Go · Composed from the cited sources · methodology
The day's real work is all in the compiler and runtime toolchain: a Darwin ARM64 external-linking failure gets patched, ARM64 SIMD grows 64-bit element reductions, and an SVE SGEMM benchmark puts SIMD at roughly three times scalar throughput.
cmd/link: don't add label symbol for unallocated symbols golang/go
External linking on Darwin ARM64 could fail after the Mach-O symbol and string tables were moved earlier: gensymlate saw those pseudo-symbols, tried to emit label symbols for the large ones, and hit a missing section because they belong to none. The fix filters unallocated symbols out of gensymlate. Anyone cross-compiling or external-linking Go binaries for darwin/arm64 should pick this up.
simd/archsimd: add an SVE SGEMM test and assembly benchmark baseline golang/go
A new archsimd test implements Float32 C = A*B for arbitrary m, k, n with the SVE API and checks it against a scalar version, alongside an assembly-kernel benchmark baseline. In the committed numbers, the SIMD path runs 64x64x64 at 9.688 GFLOPS versus 2.954 GFLOPS for scalar, though the SIMD kernel has 32,893 ns per op of unexplained time between the two listed benchmark lines.
simd: add ARM64 64-bit element Reduce* methods golang/go
ReduceSum now exists for Int64x2, Uint64x2 and Float64x2, built on ConcatAddPairs(x).GetElem(0), with ReduceMax and ReduceMin added for Float64x2 only. The Int64/Uint64 min and max reducers are absent because VSMAXP/VUMAXP lack 2D support, so integer 64-bit width reductions are not part of this API.
_content/tour: build and run code snippets as go1.26 modules golang/website
Locally the tour writes a synthetic go.mod to run snippets in module mode; with no go directive it fell back to go1.16 semantics and the generics snippets stopped building. It now declares go1.26. Running the tour from source is usable again.
_content/blog: add post for gopls interactive refactoring golang/website
go.dev now carries a post on gopls interactive refactoring, pitched at developer experience rather than internals and scoped to that feature; its date was later set to 2026-10-16, and previews run at localhost:6060/go.dev/blog/interactive-refactoring. Elsewhere the long tail is cosmetic: pkgsite corrected a quoted Docker Compose default that made the frontend read the literal "true", with the s...
