Cannot extract cornor

[vzhr]

using apriltag only in debug mode or I set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native") in CMakeLists.txt，can extract cornor. If i remove "-march=native", this does not work.

gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
cmake version 3.16.3
5.4.0-126-generic #142-Ubuntu
Ubuntu 20.04
OpenCV 4

[vzhr]

After some tests, I find the problem. The exact problems are

add_compile_options("-funsafe-math-optimizations" "-fno-signed-zeros")

added in CMakeLists.txt. What causes this problem?

[vzhr]

OK, I got it! in file GrayModel.cc, function: compute(),
change

bool invertible;
double det_unused;
A.computeInverseAndDetWithCheck(Ainv, det_unused, invertible);
   if (invertible) {
     v = Ainv * b;
     return;
   }

to:

bool invertible;
A.computeInverseWithCheck(Ainv, invertible);
    if (invertible) {
     v = A.ldlt().solve(b)
      return;
    }

A inverse is not stable.