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+Functions
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+=========
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+
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+Explain the different types of functions in the Modelverse.
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+
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+Primitive functions
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+-------------------
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+
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+Explain primitive functions:
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+hardcoded in kernel, no AL equivalent
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+minimal set of functions to be ported for new kernel
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+
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+Compiled functions
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+------------------
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+
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+Explain compiled functions:
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+hardcoded in kernel, but AL equivalent
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+can be ported for efficiency fo the resulting kernel, but not required
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+
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+Normal functions
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+----------------
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+
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+Explain normal functions:
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+completely in AL, no compiled equivalent
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+can still be implemented by kernel as compiled for performance, though not required
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+functions are likely to be flexible
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