> Another poster mentioned that pentiums > have hardware instructions for trig functions. > If you are using them, there isn't much hope for speed up. Out of interest, whats needs to be done to use these, some gcc flag ? My profiling suggests that atan2(x,y) is taking ~ 50% of some method speed. Yes, the methods is already fast, but still is this reasonable if hardware instructions are being used. Is there some way I can check to see exactly what is used ? > These formulas will probably not be useful unless > you know in advance the ranges of their arguments. Yes, I considered coding up my own methods along this line, but figured getting it correct was not a small amount of effort, and was hoping to find some project that had done it for me. cheers Chris
