eigen/bench/quatmul.cpp

#include <iostream>
#include <Eigen/Core>
#include <Eigen/Geometry>
#include <bench/BenchTimer.h>

using namespace Eigen;

template <typename Quat>
EIGEN_DONT_INLINE void quatmul_default(const Quat& a, const Quat& b, Quat& c) {
  c = a * b;
}

template <typename Quat>
EIGEN_DONT_INLINE void quatmul_novec(const Quat& a, const Quat& b, Quat& c) {
  c = internal::quat_product<0, Quat, Quat, typename Quat::Scalar, Aligned>::run(a, b);
}

template <typename Quat>
void bench(const std::string& label) {
  int tries = 10;
  int rep = 1000000;
  BenchTimer t;

  Quat a(4, 1, 2, 3);
  Quat b(2, 3, 4, 5);
  Quat c;

  std::cout.precision(3);

  BENCH(t, tries, rep, quatmul_default(a, b, c));
  std::cout << label << " default " << 1e3 * t.best(CPU_TIMER) << "ms  \t" << 1e-6 * double(rep) / (t.best(CPU_TIMER))
            << " M mul/s\n";

  BENCH(t, tries, rep, quatmul_novec(a, b, c));
  std::cout << label << " novec   " << 1e3 * t.best(CPU_TIMER) << "ms  \t" << 1e-6 * double(rep) / (t.best(CPU_TIMER))
            << " M mul/s\n";
}

int main() {
  bench<Quaternionf>("float ");
  bench<Quaterniond>("double");

  return 0;
}