Thanks))) In my case the flag ftree-vectorize don't do any vectorization(I am working in armV7 beagle board), but the application running time performs! how can it be? I don't understand(( -- View this message in context: http://old.nabble.com/ftree-vectorize-flag-tp31018642p31020247.html Sent from the gcc - Help mailing list archive at Nabble.com.