add a bench for quaternion multiplication

1 files changed, 47 insertions, 0 deletions

diff --git a/bench/quatmul.cpp b/bench/quatmul.cpp
new file mode 100644
index 000000000..d91a4b01b
--- /dev/null
+++ b/bench/quatmul.cpp
@@ -0,0 +1,47 @@
+#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 = ei_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;
+
+}
+