Method copysign

cpp/fory/util/float16.h:180–183

copysign: take magnitude from |a|, sign from b — exact, bit operation.

  }
  // copysign: take magnitude from |a|, sign from b — exact, bit operation.
  [[nodiscard]] static float16_t copysign(float16_t a, float16_t b) noexcept {
    return from_bits(
        static_cast<uint16_t>((a.bits & 0x7FFFu) | (b.bits & 0x8000u)));
  }
  [[nodiscard]] static float16_t floor(float16_t a) noexcept {
    return from_float(std::floor(a.to_float()));
  }