Meh? There will always be new CPU instructions that weren’t already part of whatever language you’re using, that corresponded to a pattern of code that people

Meh? There will always be new CPU instructions that weren’t already part of whatever language you’re using, that corresponded to a pattern of code that people are already writing in that language. And the pattern matching isn’t rocket science. I wouldn’t characterize it as “decompilation”; that makes it seem more magical than it really is. Popcnt may be a particularly amusing example but it’s far from the only one. A modern C compiler has countless patterns it recognizes, sometimes to match them to instructions, other times just to aid the compiler’s understanding of what’s going on. Usually the latter.