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.