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Tools2026-08-12 · source-backed
Victor Zverovich, author of fmt, wrote up "yy," a Schubfach-family binary-to-decimal algorithm living in yy_double.c inside ibireme's yyjson with essentially no public profile (vitaut.net). Its trick is needing one multiplication by a precomputed power of ten where classic Schubfach needs two or three, while still finding the shortest round-tripping decimal. Żmij reportedly went from Schubfach at 34.58 ns to yy at 16.61 ns, then 3.93 ns with further optimization. The fastest known implementation of a heavily-studied primitive sat unnamed in a vendored C file.
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