Add 'native architecture' optimization flag.

cmake/SetupOptimizationLevel.cmake

@@ -4,22 +4,22 @@
 #################################################################################
 
 # make sure a build type is set, default to release
-if(NOT CMAKE_BUILD_TYPE)
+if (NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release)
-endif()
+endif ()
 message("-- Using Build Type: " ${CMAKE_BUILD_TYPE})
 
 
 # Enable optimizations in release builds
-if(CMAKE_BUILD_TYPE STREQUAL "Release")
+if (CMAKE_BUILD_TYPE STREQUAL "Release")
     # Link time optimization
     set(CMAKE_CXX_FLAGS "-Wall -Wextra")
     # -O2 is often seen as 'the most speed',
     # but inlining functions and SIMD/Vectorization is
     # only enabled by -O3, thus it's way faster in some
     # array calculations.
-    set(CMAKE_CXX_FLAGS_RELEASE "-O3")
+    set(CMAKE_CXX_FLAGS_RELEASE "-O3 -march=native")
     set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
-else()
+else ()
     set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
-endif()
\ No newline at end of file
+endif ()