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• Remove string duplication (search binary with string utility to find out how much space you can save)
• Use integer error codes rather than showing error strings
• Literal pool usage reduction
  • e.g. when going from ARM to Thumb
  • group globals into structures
• .sinit usage (construct instead simple global structs)
• selectively enable optimization for some files
• refactoring duplicate code
• reduce usage of standard library functions

assertions

  if (expr) \
      {} \
  else \
      aFailed(F_NUM, __LINE__)