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The only requirement for `f16` support, aside from LLVM not crashing and no ABI issues, is that symbols to convert to and from `f32` are available. Since the update to compiler-builtins in [1], we now provide these on all platforms. This also enables `f16` math since there are no further requirements. Still excluded are platforms for which LLVM emits infinitely-recursing code. [1]: https://github.com/rust-lang/rust/pull/125016