Author: Andrew Wagner
Date: 08:08:08 02/13/04
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On February 13, 2004 at 08:47:37, Thomas McBurney wrote: >> >>>Generally the data that is the same size as the cpu registers is the most >>>efficient. So on a 32-bit machine, 32-bit variables should be the fastest to >>>work with. However, that is not the only factor. You have to take into account >>>things like the cache. Usually working with 8-bit data on a 32-bit cpu might be >>>a little slower than working with 32-bit data, but if using 8-bit data means >>>that all of your data and code fits into the cache, then using 8-bit data can be >>>significantly faster. >> >>Well, here on my laptop i'm working with a celeron 2.4 gHz cpu, which i'm pretty >>sure doesn't have a cache. So I may as well use integers, i suppose. My desktop >>has a full P4 though, so I may have to investigate some way to definet it >>differently depending on the computer i'm on. > >When you specify integers make sure they are 32 bit integers. Eg. DIM I as >long, (not DIM I as integer) > >The chess engine Minimax increased NPS by 20% when I converted all 16 bit >integers to 32 bit integers. Note: this was done using PowerBASIC not VB. > >I have a question, does VB.NET support 64 bit integers (Quad integer - Eg. Dim I >as QUAD)? A bit of a joke if it doesn't. > >Cheers, >Tom. Sure it does. They would be called Int64 though, not QUAD. And 32-bit integers are Int32.
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