move to O3 opti

CMakeLists.txt

@@ -80,9 +80,9 @@ if( ScalFMM_BUILD_DEBUG )
   ADD_DEFINITIONS(${SCALFMM_FLAGS_OPTI_DEBUG})
 else()
   SET(CMAKE_BUILD_TYPE Release)
-  # force -O2 in release
-  SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
-  STRING(REPLACE "-O3" "" CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE} )
+  # force -O3 in release
+  SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+  STRING(REPLACE "-O2" "" CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE} )
   # if compiler is intel add -ip
   IF(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
     ADD_DEFINITIONS(-ip)
@@ -94,9 +94,9 @@ else()
   ELSE()
     # Test if not apple and 64bits
     if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-       SET(SCALFMM_FLAGS_OPTI_RELEASE "-m64 -ffast-math -flto -march=native -funroll-loops" CACHE STRING "Set your optimization flags for release mode.")
+       SET(SCALFMM_FLAGS_OPTI_RELEASE "-m64 -ffast-math -flto -march=native -funroll-loops -ftree-vectorize" CACHE STRING "Set your optimization flags for release mode.")
     else()
-       SET(SCALFMM_FLAGS_OPTI_RELEASE "-ffast-math -flto -march=native -funroll-loops" CACHE STRING "Set your optimization flags for release mode.")
+       SET(SCALFMM_FLAGS_OPTI_RELEASE "-ffast-math -flto -march=native -funroll-loops -ftree-vectorize" CACHE STRING "Set your optimization flags for release mode.")
     endif()
   ENDIF()
   ADD_DEFINITIONS(${SCALFMM_FLAGS_OPTI_RELEASE})