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02/14/01 07:59
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 		 #9282 - use of multiply in large data arrays
My problem is the following.

I am making a program which handles a lot of data, this data is stored in arrays of 15,16 bytes (struct) per member. When I want to acces a member inside this array I have to multiply the number of the arraymember with the membersize and add the baseaddres to this result.

This process consumes a lot of time and also makes use of the mul instruction.

Luckily I use the DS80C390 of dallas and this baby has a hardwareaccelerator for mathematical instructions.

Despite this accelerator this still takes to much time in my eyes.

Can someone tell me if ther is a more efficient way of accesing arraymembers.

I have to tell that my program is in C, but assembler directives are also welcome.

With kind regards,

Patrick Klok


List of 30 messages in thread
TopicAuthorDate
use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
<types.h> invisible !            01/01/70 00:00      
RE: <types.h> invisible !            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
RE: use of multiply in large data arrays            01/01/70 00:00      
The FASTEST !            01/01/70 00:00      
RE: The FASTEST !            01/01/70 00:00      
Work the problem backwards            01/01/70 00:00      

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