Author: Scott Gasch
Date: 18:54:02 07/20/04
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A lot of people have suggested & and >> etc... bitwise operations. You might also look at using bitfields in structs and letting the compiler figure out the bit twiddling. It involves some trust in the compiler which is hard for many people... but it should produce the same code. I think it ends up more readable and gives the compiler the chance to be smart (do things better if it knows how). That said, I would also take a hard look at the code the below generates and go to macros with >> and & in them if I was dissatisfied. typedef struct _MOVE { UCHAR uFrom : 7; UCHAR uTo : 7; ... } MOVE; --- MOVE mv; mv.uFrom = D2; mv.uTo = D4; etc. I don't know this for sure but I also greatly suspect that you'll get better, faster code if you devote 8 bits to the from/to parts. That aligns them on CHAR boundaries... Good luck, Scott
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