("arm64ec", _) => false,

// MinGW ABI bugs <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>

("x86_64", "windows") => false,

// x86 has ABI bugs that show up with optimizations. This should be partially fixed with

// the compiler-builtins update. <https://github.com/rust-lang/rust/issues/123885>

("x86" | "x86_64", _) => false,

// Apple has a special ABI for `f16` that we do not yet support

// FIXME(builtins): fixed by <https://github.com/rust-lang/compiler-builtins/pull/675>

("x86" | "x86_64", _) if target_vendor == "apple" => false,

// Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`

("powerpc" | "powerpc64", _) => false,

// Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`

_ => false,

};

// These are currently empty, but will fill up as some platforms move from completely

// unreliable to reliable basics but unreliable math.

// Configure platforms that have reliable basics but may have unreliable math.

// LLVM is currenlty adding missing routines, <https://github.com/llvm/llvm-project/issues/93566>

let has_reliable_f16_math = has_reliable_f16

&& match (target_arch.as_str(), target_os.as_str()) {

// FIXME: Disabled on Miri as the intrinsics are not implemented yet.

_ if is_miri => false,

// Currently nothing special. Hooray!

// This will change as platforms gain better better support for standard ops but math

// lags behind.

// x86 has a crash for `powi`: <https://github.com/llvm/llvm-project/issues/105747>

("x86" | "x86_64", _) => false,

// Assume that working `f16` means working `f16` math for most platforms, since

// operations just go through `f32`.

_ => true,

};