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Question about code optimize



hi,I have problem about code optimization.

1.
Is it possible to optimize any algorithm or function when it is transpalanted from PC to DSP?
If there  were some algorithms can't be optimized, can you give some examples?

2.
Theoretically , what is the limit of optimizing algorithm for C64+dsp?

3.
 I have checked so many materials on improving the performance. It is said that combining EDMA and using on chip memory can help a lot. Also I have

witnessed it raised the speed eight times by someone.  How did it work? What's the principle of it? I did the same,however it failed. Who knows the

reason?