Hi, I have read about SIMD(SSE,SSE2....) features of Pentium 4. I know that one can write code to explioit such a feature by using functions in <xmmintrin.h>..... Given a C program which does not exploit SIMD feature, but can be modified to exploit such a feature, can GCC optimizer modifies the code to exploit it??? Please send any source to know more about this. Thanks in advance. ___________________________________________________________ All New Yahoo! Mail ? Tired of Vi@gr@! come-ons? Let our SpamGuard protect you. http://uk.docs.yahoo.com/nowyoucan.html