Author: Fabien Letouzey
Date: 06:15:12 03/26/04
Go up one level in this thread
On March 26, 2004 at 09:13:12, Fabien Letouzey wrote: >On March 26, 2004 at 09:07:18, Slater Wold wrote: > >>On March 26, 2004 at 08:50:51, Fabien Letouzey wrote: >> >>>>>I find it interesting; do you feel like investigating? >>>> >>>>Yes. I can, and will. I started looking last nite, but ran out of time. >>> >>>It's not urgent of course, but I think we've got something to learn. >>>For instance a way not to do things for 64-bit platforms :) >>> >>>>>One drawback of 64-bit ints and pointers is that they could take more space in >>>>>memory, but I thought I carefully avoided that everywhere ... >>> >>>>I am not sure what's slowing it down. I could clearly see why it might not get >>>>a huge speedup, but the 10% slow down is confusing. >>> >>>I pass many pointers as function arguments (for instance I pass a pointer to the >>>board everyhere instead of using a global variable). To me an argument is the >>>same as a local variable, and the slow down is very small on 32-bit platforms I >>>am sure. >> >>This was my first guess. You cannot cast pointers to int, long, ULONG, or DWORD >>in 64-bit. And there's a whole slew of other things to look at, also. > >I don't do any tricks with pointers, I don't even store them in any struct or >array (only local variables, that's registers or stack). I just pass them as >argument; no pointer arithmetic ... > >>It very well maybe a part of it, but I think investigating the pointers, >>arguments, and variables is a better place to start. > >Well if profiling reveals a clear difference between the 32-bit and 64-bit >version that would be easy. Of course I am expecting no such thing. > >Alternately, I could read the AMD 64-bit recommendations looking for something >that I do differently. I didn't bother because Fruit does not use bitboards. > >Fabien. Would there be a reason why, for instance, 16-bit integers would be slower in 64-bit mode? Fabien.
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