barriers & registers tracking for sass disasm

Finally I add registers tracking in my perl sass disasm Now I can do some full-featured analysis of sass - like find candidates pairs of instruction to swap/run them in so called " dual " mode - and all of this in barely 1200 LoC of perl code Let's think what must mean for couple of instructions to be fully independent: they should belong to the same block - like in case of IADD R8, -R3, RZ…