Merge Gael's experimental OpenMP parallelization support into Assign.h.

bench/benchmarkXL.cpp

@@ -0,0 +1,34 @@
+// g++ -O3 -DNDEBUG benchmarkX.cpp -o benchmarkX && time ./benchmarkX
+
+#include <Eigen/Core>
+
+using namespace std;
+USING_PART_OF_NAMESPACE_EIGEN
+
+#ifndef MATTYPE
+#define MATTYPE MatrixXLd
+#endif
+
+#ifndef MATSIZE
+#define MATSIZE 400
+#endif
+
+#ifndef REPEAT
+#define REPEAT 10000
+#endif
+
+int main(int argc, char *argv[])
+{
+	MATTYPE I = MATTYPE::identity(MATSIZE,MATSIZE);
+	MATTYPE m(MATSIZE,MATSIZE);
+	for(int i = 0; i < MATSIZE; i++) for(int j = 0; j < MATSIZE; j++)
+	{
+		m(i,j) = 0.1 * (i+MATSIZE*j)/MATSIZE;
+	}
+	for(int a = 0; a < REPEAT; a++)
+	{
+		m = I + 0.00005 * (m + m/4);
+	}
+	cout << m(0,0) << endl;
+	return 0;
+}