Squashed 'third_party/eigen/' content from commit 61d72f6
Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/bench/benchmarkSlice.cpp b/bench/benchmarkSlice.cpp
new file mode 100644
index 0000000..c5b89c5
--- /dev/null
+++ b/bench/benchmarkSlice.cpp
@@ -0,0 +1,38 @@
+// g++ -O3 -DNDEBUG benchmarkX.cpp -o benchmarkX && time ./benchmarkX
+
+#include <iostream>
+
+#include <Eigen/Core>
+
+using namespace std;
+using namespace Eigen;
+
+#ifndef REPEAT
+#define REPEAT 10000
+#endif
+
+#ifndef SCALAR
+#define SCALAR float
+#endif
+
+int main(int argc, char *argv[])
+{
+ typedef Matrix<SCALAR, Eigen::Dynamic, Eigen::Dynamic> Mat;
+ Mat m(100, 100);
+ m.setRandom();
+
+ for(int a = 0; a < REPEAT; a++)
+ {
+ int r, c, nr, nc;
+ r = Eigen::internal::random<int>(0,10);
+ c = Eigen::internal::random<int>(0,10);
+ nr = Eigen::internal::random<int>(50,80);
+ nc = Eigen::internal::random<int>(50,80);
+ m.block(r,c,nr,nc) += Mat::Ones(nr,nc);
+ m.block(r,c,nr,nc) *= SCALAR(10);
+ m.block(r,c,nr,nc) -= Mat::constant(nr,nc,10);
+ m.block(r,c,nr,nc) /= SCALAR(10);
+ }
+ cout << m[0] << endl;
+ return 0;
+}