f128 is used at run time in 4 crates (of which 1 optionally). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) f128 version
rustycpp ^0.2.9
sqlite3-native ^0.2.6
rust-poly ^0.2.9
220 heapbuf optional ^0.2.9
370 1 ode_integrate dev ^0.2