emacs drives me nuts questions

emacs drives me nuts answers

• char arrays in PROGMEM
• GCC produces unneccessary register pushes for simple ISR on AVR
• Moving data into __uint24 with assembly
• AVR Instruction Sets and "missing" instructions by device
• Where is the offset of the Y register from the call/stack frame in avr-gcc coming from?
• Why AVR-GCC compilers append a "clr r1" line after multiplication?
• AVR C compilers behavior. Memory management
• Why does GCC compile itself 3 times?
• Why returning NULL from main()?