Cargo Features

[dependencies]
utf-c = { version = "1.0.0", default-features = false, features = ["simd", "simd_extra"] }
default = simd

The simd feature is set by default whenever utf-c is added without default-features = false somewhere in the dependency tree.

simd default

Use SSE2 or NEON

simd_extra

Use AVX2 (Requires the "simd" feature)