Motorola 680x0 specific

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#### 11.2.2 Motorola 680x0 specific

Using the -O2 (the default) switch does several optimizations in the code produced, the most notable being:

- Sign extension from byte to long will use EXTB.
- Returning of functions will use RTD.
- Range checking will generate no run-time calls.
- Multiplication will use the long MULS instruction, no runtime library call will be generated.
- Division will use the long DIVS instruction, no runtime library call will be generated.

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