compilerRtFloatAbi

pub fn compilerRtFloatAbi(target: *const std.Target, bits: u16) std.Target.Abi.Float {
    if (target.cpu.has(.x86, .soft_float)) return .soft;
    // Marks targets where clang does not even provide a usable C type.
    const no_c_type_available = .soft;
    switch (bits) {
        else => unreachable,
        16 => if (target.cpu.arch.isMIPS() or target.cpu.arch.isPowerPC()) return no_c_type_available,
        32, 64 => {},
        80 => if (target.cTypeBitSize(.longdouble) != 80) return no_c_type_available,
        128 => {
            if (target.cpu.arch.isX86()) return .hard; // if (target.abi == .msvc) __m128i else __float128
            if (target.cTypeBitSize(.longdouble) != 128) return no_c_type_available;
        },
    }
    return .hard;
}