Compiler Explorer is the coolest damn thing I’ve seen in a very long while.
It’s not that it’s anything you couldn’t do yourself, it’s the friction-free presentation that really lands the experience. I’ve spent time looking over dissasembly of various compilers, marveling at how neatly the generated code changes as I fiddle with const’ness and optimization levels, but the feedback loop of doing all this in the web browser is super satisfying and encourages quick experimentation. The ability of modern compilers to optimize is really astonishing. It’s a remarkably useful tool that does nothing you couldn’t have otherwise done, but does it better.