I'm trying to build a table of "missing" AVR instructions by device.
For want of any available documentation, I've been comparing the source-code of avra, gavrasm and avrlass and I don't seem to be able to find any concensus.
For example, the ATtiny2313, according to the avra source lacks MUL, EIJMP, EICALL, JMP, ELPM, and ESPM.
But according to gavrasm, it doesn't have MUL, FMUL, EIJMP, EICALL, JMP, CALL, ELPM, ELPM/Z, SPM/Z, DES, XCH, LAS, LAC, LAT.
(avrlass is an outlier here because it expects the user to specify which of the AVR, AVRe, AVRe+, AVRrc, AVRxm, or AVRxt instruction sets are being used)
Does anyone know where I can find a (preferably, machine readable) "single source of truth"?
Ideally, I'd like a table of instruction set by device, and a table of which instructions are supported or missing in each instruction set.
Although bearing in mind Atmel/Microchip's "love" for such things, I expect there to be several situations where "device X supports instruction set Y EXCEPT (insert peculiar corner case here)".
I've also downloaded the (ATDF) XML specs from https://packs.download.microchip.com/ but these don't seem to include instruction set.
The Atmel/Microchip document AVR-InstructionSet-Manual-DS40002198.pdf has exactly what you seek. Appendix A lists the different cores and which instructions are missing as a baseline, then a table for each device identifying which core it is and which further instructions are missing for that particular device.