I built "fc", a C library for compressing streams of 64-bit floating-point values without quantization.
It is not trying to replace zstd or lz4. The idea is narrower: take blocks of doubles, try a set of float-specific predictors/transforms/coders, and emit whichever representation is smallest for that block.
It is aimed at time-series, scientific, simulation, and analytics data where the numbers often have structure: smooth curves, repeated values, fixed increments, periodic signals, predictable deltas, or low-entropy mantissas.
The API is intentionally small: "fc_enc", "fc_dec", a config struct, and a few counters to inspect which modes won. Decode is parallel and meant to be fast; encode spends more CPU searching for a better representation.
Current caveats: x86-64 only for now, tuned for IEEE-754 doubles, research-grade rather than production-hardened.
Does it assume the floats come from photos or sound or something?
enduku•4h ago
It is intended t obe mainly source agnostic (will try to add custom source predictors too). The idea is to treat input as an ordered stream of doubles and look for numeric structure like repeats, smooth deltas, fixed increments, or low-entropy bits. Target presentlyis scientific/time-series/simulation/analytics data, not photos or sound.
Scaevolus•29m ago
I see you have ALP, but have you tried Chimp128 or Arrow's byte stream split?
enduku•2d ago
It is not trying to replace zstd or lz4. The idea is narrower: take blocks of doubles, try a set of float-specific predictors/transforms/coders, and emit whichever representation is smallest for that block.
It is aimed at time-series, scientific, simulation, and analytics data where the numbers often have structure: smooth curves, repeated values, fixed increments, periodic signals, predictable deltas, or low-entropy mantissas.
The API is intentionally small: "fc_enc", "fc_dec", a config struct, and a few counters to inspect which modes won. Decode is parallel and meant to be fast; encode spends more CPU searching for a better representation.
Current caveats: x86-64 only for now, tuned for IEEE-754 doubles, research-grade rather than production-hardened.
Repo: https://github.com/xtellect/fc
gus_massa•1d ago
enduku•4h ago