CMake Cookbook

Getting ready

We will use the Eigen C++ template library for linear algebra and show how to set up compiler flags to enable vectorization. The source code for this recipe the linear-algebra.cpp file:

#include <chrono> #include <iostream> #include <Eigen/Dense> EIGEN_DONT_INLINE double simple_function(Eigen::VectorXd &va, Eigen::VectorXd &vb) { // this simple function computes the dot product of two vectors // of course it could be expressed more compactly double d = va.dot(vb); return d; } int main() { int len = 1000000; int num_repetitions = 100; // generate two random vectors Eigen::VectorXd va = Eigen::VectorXd::Random(len); Eigen::VectorXd vb = Eigen::VectorXd::Random(len); double result; auto start = std::chrono::system_clock::now(); ...