Show HN: I built a CSV parser to try Go 1.26's new SIMD package
tokkyokky Tuesday, January 27, 2026
Hey HN,
A CSV parser using Go 1.26's experimental simd/archsimd package.
I wanted to see what the new SIMD API looks like in practice. CSV parsing is mostly "find these bytes in a buffer"—load 64 bytes, compare, get a bitmask of positions. The interesting part was handling chunk boundaries correctly (quotes and line endings can split across chunks).
- Drop-in replacement for encoding/csv - ~20% faster for unquoted data on AVX-512 - Quoted data is slower (still optimizing) - Scalar fallback for non-AVX-512
Requires GOEXPERIMENT=simd.
https://github.com/nnnkkk7/go-simdcsv
Feedback on edge cases or the SIMD implementation welcome.
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