Method frexp

dnn/include/megdnn/dtype/bfloat16.hpp:1191–1194

    /// \param exp address to store exponent at
    /// \return normalized significant
    MEGDNN_HOST MEGDNN_DEVICE static bfloat16 frexp(float arg, int* exp) {
        return bfloat16(binary_t(), float2bfloat16<bfloat16::round_style>(
                                            std::frexp(arg, exp)));
    }

    /// Decompression implementation.
    /// \param arg number to decompress