french@caip.RUTGERS.EDU (12/17/85)
From: "french robert%c.mfenet"@LLL-MFE.ARPA DEC.BANKS@MARLBORO.DEC.COM writes: >...you could perhaps speed up your inner loop...if you replaced >the computation with something similar to what we used in our ABasiC >Mandelbrot program... Dawn, first let me thank you for taking the time to try out my version of the program. Yours is the first response I have gotten. I have no doubt that your 68000 assembly language code is faster than my C code, even using the FFP routines. The only reasons I didn't write that section in 68000 are: 1) I wanted to get a working version out the "door" as soon as possible, and 2) I don't speak 68000 assembly language yet (am learning it, though). I would look at the code that you included with your AbasiC version, but unfortunately, due to a mailer error (he he), I was unable to download it. If you would send it to me again (at least the 68000 portion), I would be glad to analyze it and place it in my program. I have been thinking about writing my own specialized FP routines, since so much in the Mandelbrot equation can be optimized on a binary level (like multiplication by two), but haven't gotten around to it yet. A friend of mine wrote an integer version of the program (using 3 digit precision...not terrific, but better than nothing) and got a marked increase in speed. Thanks for your input! Robert French French#Robert%d@LLL-MFE.ARPA