CMake : use -Ofast flag

Author: apicalshark

CMakeLists.txt

@@ -12,7 +12,7 @@ endif()
 
 set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused-variable -Wno-unused-function -Wno-error")
 set(CMAKE_CXX_FLAGS_DEBUG "-g")
-set(CMAKE_CXX_FLAGS_RELEASE "-O3")
+set(CMAKE_CXX_FLAGS_RELEASE "-Ofast")
 
 #add lto
 set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)