Function fastfloat_strncasecmp3

app/src/ThirdParty/fast_float.h:423–467

template <typename UC>
inline FASTFLOAT_CONSTEXPR14 bool
fastfloat_strncasecmp3(UC const *actual_mixedcase,
                       UC const *expected_lowercase) {
  uint64_t mask{0};
  FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 1) { mask = 0x2020202020202020; }
  else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 2) {
    mask = 0x0020002000200020;
  }
  else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 4) {
    mask = 0x0000002000000020;
  }
  else {
    return false;
  }

  uint64_t val1{0}, val2{0};
  if (cpp20_and_in_constexpr()) {
    for (size_t i = 0; i < 3; i++) {
      if ((actual_mixedcase[i] | 32) != expected_lowercase[i]) {
        return false;
      }
    }
    return true;
  } else {
    FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 1 || sizeof(UC) == 2) {
      ::memcpy(&val1, actual_mixedcase, 3 * sizeof(UC));
      ::memcpy(&val2, expected_lowercase, 3 * sizeof(UC));
      val1 |= mask;
      val2 |= mask;
      return val1 == val2;
    }
    else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 4) {
      ::memcpy(&val1, actual_mixedcase, 2 * sizeof(UC));
      ::memcpy(&val2, expected_lowercase, 2 * sizeof(UC));
      val1 |= mask;
      if (val1 != val2) {
        return false;
      }
      return (actual_mixedcase[2] | 32) == (expected_lowercase[2]);
    }
    else {
      return false;
    }
  }
}

template <typename UC>
inline FASTFLOAT_CONSTEXPR14 bool