Hi, I tried it with _mm_stream_si128(&a[1],m128) function. But I got compilation error. I have read about MOVDQU instruction in intel manuals. What is the equilant function defined at c level( for gcc) in (what)header files? Thanks in advance. ___________________________________________________________ What kind of emailer are you? Find out today - get a free analysis of your email personality. Take the quiz at the Yahoo! Mail Championship. http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk