alex@athertn.Atherton.COM (Alex Leavens) (01/16/90)
One note about 68881 co-processors: You should re-write your code to take specific advantage of the device if it is, in fact, there. Otherwise, the speed inprovement that you recieve is not very good. For example, a fractal tree drawing program that I wrote does very intensive math calculations: strictly in C, it takes about 20 minutes to draw a 'tree' in C, but using the 68881 math libraries, takes 13 minutes (better, but not really all that good) re-coding the algorithm to directly access the 68881, (ie, load all the registers and do the calculations there), it takes under 2 minutes. Another example is a fast fourier transform program: to analyze 64 data points, in C: appx. 32 seconds using the 68881 directly (via C macros): .38 seconds (less than 4 tenths of a second). How you use the 68881 is very important to the performance benefits you get from it! -- |-------------------------------------------------------------------------| |--alex | alex@atherton.com | Caution! Falling Opinions, next 6 miles | | Now who are you gonna believe--me, or your own lyin' eyes? | |-------------------------------------------------------------------------|