Code Expansion

An essential topic for automatic programming is code expansion: converting a compact description of a computation into an expanded description of the details.

This has advantages and disadvantages:

• Expansion increases code size. In the worst case, code size could become infinite.

• Expansion often makes some things constant; optimization can then improve speed and reduce code size.

There are several common kinds of code expansion:

• Macro expansion and pattern-based expansion.

• Loop unrolling

• In-line function expansion

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