I guess I know why I had trouble with some IPPs. It's the length!!! Be very carefull with it!
For example ippsDotProd function is faster only ifvector length is higher than ~30 (on my Pentium 4)! The longer the vector the more speed gain you have... see the graph below.
IPP vector length is very important...
пт, 19/12/2003 - 11:16