What is the significane of _builtin* functions? How gcc handles them? Examples of such functions can be found in mmintrin.h or xmmintrin.h 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