eigen/bench/basicbenchmark.h

#ifndef EIGEN_BENCH_BASICBENCH_H
#define EIGEN_BENCH_BASICBENCH_H

enum { LazyEval, EarlyEval, OmpEval };

template <int Mode, typename MatrixType>
void benchBasic_loop(const MatrixType& I, MatrixType& m, int iterations) __attribute__((noinline));

template <int Mode, typename MatrixType>
void benchBasic_loop(const MatrixType& I, MatrixType& m, int iterations) {
  for (int a = 0; a < iterations; a++) {
    if (Mode == LazyEval) {
      asm("#begin_bench_loop LazyEval");
      if (MatrixType::SizeAtCompileTime != Eigen::Dynamic) asm("#fixedsize");
      m = (I + 0.00005 * (m + m.lazyProduct(m))).eval();
    } else if (Mode == OmpEval) {
      asm("#begin_bench_loop OmpEval");
      if (MatrixType::SizeAtCompileTime != Eigen::Dynamic) asm("#fixedsize");
      m = (I + 0.00005 * (m + m.lazyProduct(m))).eval();
    } else {
      asm("#begin_bench_loop EarlyEval");
      if (MatrixType::SizeAtCompileTime != Eigen::Dynamic) asm("#fixedsize");
      m = I + 0.00005 * (m + m * m);
    }
    asm("#end_bench_loop");
  }
}

template <int Mode, typename MatrixType>
double benchBasic(const MatrixType& mat, int size, int tries) __attribute__((noinline));

template <int Mode, typename MatrixType>
double benchBasic(const MatrixType& mat, int iterations, int tries) {
  const int rows = mat.rows();
  const int cols = mat.cols();

  MatrixType I(rows, cols);
  MatrixType m(rows, cols);

  initMatrix_identity(I);

  Eigen::BenchTimer timer;
  for (uint t = 0; t < tries; ++t) {
    initMatrix_random(m);
    timer.start();
    benchBasic_loop<Mode>(I, m, iterations);
    timer.stop();
    cerr << m;
  }
  return timer.value();
};

#endif  // EIGEN_BENCH_BASICBENCH_H