This might be a dumb question, but does anyone know of a bitwise shift shortcut using either a single addition or subtraction?
I specifically need to perform both a >>2 and <<2 shift, or in simpler words, shift left or right 2 bits, without having to shift and rotate to another variable twice.
I specifically need to perform both a >>2 and <<2 shift, or in simpler words, shift left or right 2 bits, without having to shift and rotate to another variable twice.
Comments
What's preventing you from adding 1 to the offset in the first set of calculations? (if that works how I think it does)
Additionally, can you pre-multiply tileindex additions by 8 and add do (tileindex*8) + (n + Offset) for a parallel calculation?
All of which must be done in 6502 Assembly, just to clarify why I asked in the first place.
It feels like a huge waste to do single bit rotation twice for all the bytes involved.
Unless this is as good as it could be, then nevermind the question, lol