initial commit

third_party/eigen/bench/bench_sum.cpp

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+#include <iostream>
+#include <Eigen/Core>
+using namespace Eigen;
+using namespace std;
+
+int main() {
+  typedef Matrix<SCALAR, Eigen::Dynamic, 1> Vec;
+  Vec v(SIZE);
+  v.setZero();
+  v[0] = 1;
+  v[1] = 2;
+  for (int i = 0; i < 1000000; i++) {
+    v.coeffRef(0) += v.sum() * SCALAR(1e-20);
+  }
+  cout << v.sum() << endl;
+}