1 files changed, 84 insertions, 0 deletions
diff --git a/eigen/bench/bench_reverse.cpp b/eigen/bench/bench_reverse.cpp
new file mode 100644
index 0000000..1e69ca1
--- /dev/null
+++ b/eigen/bench/bench_reverse.cpp
@@ -0,0 +1,84 @@
+
+#include <iostream>
+#include <Eigen/Core>
+#include <bench/BenchUtil.h>
+using namespace Eigen;
+
+#ifndef REPEAT
+#define REPEAT 100000
+#endif
+
+#ifndef TRIES
+#define TRIES 20
+#endif
+
+typedef double Scalar;
+
+template <typename MatrixType>
+__attribute__ ((noinline)) void bench_reverse(const MatrixType& m)
+{
+  int rows = m.rows();
+  int cols = m.cols();
+  int size = m.size();
+
+  int repeats = (REPEAT*1000)/size;
+  MatrixType a = MatrixType::Random(rows,cols);
+  MatrixType b = MatrixType::Random(rows,cols);
+
+  BenchTimer timerB, timerH, timerV;
+
+  Scalar acc = 0;
+  int r = internal::random<int>(0,rows-1);
+  int c = internal::random<int>(0,cols-1);
+  for (int t=0; t<TRIES; ++t)
+  {
+    timerB.start();
+    for (int k=0; k<repeats; ++k)
+    {
+      asm("#begin foo");
+      b = a.reverse();
+      asm("#end foo");
+      acc += b.coeff(r,c);
+    }
+    timerB.stop();
+  }
+
+  if (MatrixType::RowsAtCompileTime==Dynamic)
+    std::cout << "dyn   ";
+  else
+    std::cout << "fixed ";
+  std::cout << rows << " x " << cols << " \t"
+            << (timerB.value() * REPEAT) / repeats << "s "
+            << "(" << 1e-6 * size*repeats/timerB.value() << " MFLOPS)\t";
+
+  std::cout << "\n";
+  // make sure the compiler does not optimize too much
+  if (acc==123)
+    std::cout << acc;
+}
+
+int main(int argc, char* argv[])
+{
+  const int dynsizes[] = {4,6,8,16,24,32,49,64,128,256,512,900,0};
+  std::cout << "size            no sqrt                           standard";
+//   #ifdef BENCH_GSL
+//   std::cout << "       GSL (standard + double + ATLAS)  ";
+//   #endif
+  std::cout << "\n";
+  for (uint i=0; dynsizes[i]>0; ++i)
+  {
+    bench_reverse(Matrix<Scalar,Dynamic,Dynamic>(dynsizes[i],dynsizes[i]));
+    bench_reverse(Matrix<Scalar,Dynamic,1>(dynsizes[i]*dynsizes[i]));
+  }
+//   bench_reverse(Matrix<Scalar,2,2>());
+//   bench_reverse(Matrix<Scalar,3,3>());
+//   bench_reverse(Matrix<Scalar,4,4>());
+//   bench_reverse(Matrix<Scalar,5,5>());
+//   bench_reverse(Matrix<Scalar,6,6>());
+//   bench_reverse(Matrix<Scalar,7,7>());
+//   bench_reverse(Matrix<Scalar,8,8>());
+//   bench_reverse(Matrix<Scalar,12,12>());
+//   bench_reverse(Matrix<Scalar,16,16>());
+  return 0;
+}
+