Hi, I wrote a c program which uses functions and data types defined in xmmintrin.h. Suprisingly, in assembly code, produced by gcc, each function call is replaced by a single assembly instruction. What is the special about functions defined in xmmintrin.h. How they are compiled by gcc? Any answers or any matirial? Thanks in advance. ___________________________________________________________ New Yahoo! Mail is the ultimate force in competitive emailing. Find out more at the Yahoo! Mail Championships. Plus: play games and win prizes. http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk