testz() not working properly on AVX512

[geehang]

The result of testz(m_not) is incorrect. It should be 1 instead of 0.
The result is correct on AVX2.

Code:

  std::cout << mipp::InstructionFullType << std::endl;
  using T = int16_t;
  constexpr auto N = mipp::N<T>();
  cout << "N = " << N << endl;
  Msk<N> m = true;
  cout << "m = " << m << "\n";
  cout << "testz(m) = " << mipp::testz(m) << "\n";
  Msk<N> m_not = ~m; // & true;
  cout << "m_not = " << m_not << "\n";
  cout << "testz(m_not) = " << mipp::testz(m_not) << "\n";

Result:

AVX512
N = 32
m = [ 1, 1, 1, 1, 1, 1, 1, 1 | 1, 1, 1, 1, 1, 1, 1, 1 | 1, 1, 1, 1, 1, 1, 1, 1 | 1, 1, 1, 1, 1, 1, 1, 1]
testz(m) = 0
m_not = [ 0, 0, 0, 0, 0, 0, 0, 0 | 0, 0, 0, 0, 0, 0, 0, 0 | 0, 0, 0, 0, 0, 0, 0, 0 | 0, 0, 0, 0, 0, 0, 0, 0]
testz(m_not) = 0