Igor Proskurin

Thanks for getting back to me. I was running `tests-target`. I did more testing this morning. It turns out that this problem is compiler dependent, which is probably an indication...

Looks like being an already reported SimulAVR issue: https://savannah.nongnu.org/bugs/?66044. I spent some time with GDB today. The problem is indeed with `st X+, r0` instruction in this block: ``` Dump...

I looked into the instruction decoder in the SimulAVR Git repo. Masking XYZ registers in LD/ST instructions is not supported. The following logic required by the "AVR Instruction Set Manual"...