Instruction set avr1 is for the minimal AVR core, not supported by the C compiler, only for assembler programs (MCU types: at90s1200, attiny10, attiny11, attiny12, attiny15, attiny28).
Instruction set avr2 (default) is for the classic AVR core with up to 8K program memory space (MCU types: at90s2313, at90s2323, attiny22, attiny26, at90s2333, at90s2343, at90s4414, at90s4433, at90s4434, at90s8515, at90c8534, at90s8535, at86rf401, attiny13, attiny2313, attiny261, attiny461, attiny861, attiny24, attiny44, attiny84, attiny25, attiny45, attiny85).
Instruction set avr3 is for the classic AVR core with up to 128K program memory space (MCU types: atmega103, atmega603, at43usb320, at43usb355, at76c711).
Instruction set avr4 is for the enhanced AVR core with up to 8K program memory space (MCU types: atmega48, atmega8, atmega83, atmega85, atmega88, atmega8515, atmega8535, atmega8hva, at90pwm1, at90pwm2, at90pwm3).
Instruction set avr5 is for the enhanced AVR core with up to 128K program memory space (MCU types: atmega16, atmega161, atmega162, atmega163, atmega164p, atmega165, atmega165p, atmega168, atmega169, atmega169p, atmega32, atmega323, atmega324p, atmega325, atmega325p, atmega329, atmega329p, atmega3250, atmega3250p, atmega3290, atmega3290p, atmega406, atmega64, atmega640, atmega644, atmega644p, atmega128, atmega1280, atmega1281, atmega645, atmega649, atmega6450, atmega6490, atmega16hva, at90can32, at90can64, at90can128, at90usb82, at90usb162, at90usb646, at90usb647, at90usb1286, at90usb1287, at94k).
Instruction set avr6 is for the enhanced AVR core with 256K program memory space (MCU types: atmega2560, atmega2561).
rjmp/rcallinstructions with 8K wrap-around.