"Compile to Thumb instructions.
Use -Os to optimise for space.
Look for unnecessary code.
Look for examples of registers used in the wrong place."
Optimizing Code for Small Size
Many people know the -Os flag of gcc to reduce the code size. Now a while ago Benno posted some tipps to reduce the size of a compiled program for ARM, which give a good hint what to look for in any case. His Summary
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