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Thanks for the answer but to check if it's running in the Cache I need to see the registers in a debug view?
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No. Debug view is not required. Just check if your execution time improves with this change
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So, my getPixel function is similar to yours.
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Nope. Your function returns a single pixel, mine 8. In an uncached system my code is faster, since the bottleneck is the number of sdram accesses.
Each sdram access involves a lot of delays (RAS, CAS, ...) while the bit extraction is made at cpu-register level.
In your case you make 7 out of 8 duplicate accesses to the same sdram address, so you lose a lot of time if the system is rather dumb and it accesses sdram every time as if it was a random address.
Actually I don't know how processor bus handles sdram access, that's why I suggest this simple code trick to verify if you have any improvement.
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