Author: Uri Blass
Date: 08:55:42 09/24/03
Go up one level in this thread
On September 24, 2003 at 09:40:17, Uri Blass wrote: >On September 24, 2003 at 09:01:12, Tim Foden wrote: > >>On September 24, 2003 at 07:43:33, Uri Blass wrote: >> >>>I was told that unsigned varaibles are better to use in every case that I can do >>>it. >>> >>>one of the varaibles that cannot get negative value is the ply of the search but >>>the problem is that this varaible is connected with beta because I tell movei >>>always that beta cannot be more than 9999-ply >>> >>>How do you solve that problem? >>> >>>practically I was too lazy to replace all my varaibles and decided only to >>>replace few varaibles and remember that rule for new varaibles. >>> >>>It was another varaible that I defined as unsigned and was connected with ply >>>and when I got the warning >>>signed/unsigned mismatch I tried to change ply to be unsigned and got more >>>warning of the same kind because beta is unsigned. >> >>How can beta be unsigned? It doesn't seem to make sense to be to have an >>unsigned beta. Maybe you meant to say signed here? > >You are right > >beta is signed when ply is unsigned or should be unsigned. >> >>> >>>I can get rid of the warning by adding signed. >>> >>>if (beta>9999-(signed)ply) >>> beta=9999-(signed)ply; >>> >>>I doubt if it is a good idea and it is possible that the conversion is going to >>>cost time for the computer. >> >>No, AFAIK, it should not cost any time in this case. It just changes the way >>the compiler thinks about the ply value. It doesn't actually convert a value >>from unsigned to signed. It just causes the value to be interpreted as signed >>where it was previously interpreted as being unsigned. >> >>Cheers, Tim. > >Thanks. >I guess that you are right. >I had no idea about the way that the computer works and I thought it may need >more time to use value as signed when it usually use it as unsigned. > >Uri I decided to keep it int and not unsigned int because I found that int is slightly faster. Maybe it is a random compiler optimization but I suspect that it is possible that the compiler can do some optimization that it cannot do when there is a casting to signed int in part of the cases. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.