6.6.2 : Automatic vectorization (by the compiler)

• 6.6.2.1) Things to verify before vectorizing
• 6.6.2.2) The full main_vectorize.cpp file
• 6.6.2.3) The CMakeLists.txt file
• 6.6.2.4) Compilation
• 6.6.2.5) The performances with vectorization by the compiler