Function int64Bits2Double

tests/ftoa_test.cpp:43–47

}

static double int64Bits2Double(uint64_t bits) {
  double f;
  memcpy(&f, &bits, sizeof(double));
  return f;
}

static double ieeeParts2Double(const bool sign, const uint32_t ieeeExponent,
                               const uint64_t ieeeMantissa) {