Using MinGW. The following code:

Code: Select all

#include <Eigen/Dense>

using namespace Eigen;

int main(int argc, char **argv) {
#ifdef EIGEN_VECTORIZE
   fprintf(stdout, "Eigen: Vectorization is %s\n", "on");
#endif

   Vector4f a, b;
   asm("#it begins here!");
   a += b;
   asm("#it ends here!");

   return 0;
}


EIGEN_VECTORIZE is not declared, and disassembly contains regular registers, futhermore it does not show asm comments.

I've tried several compiler flags.

Any ideas?

you need at least gcc 4.2 and on 32bits use the -msse2 flag.

Sure, all those requirements were met. Anyway never mind it was Eclipse build problems and stuff...