CppCon 2019: Matt Godbolt “Compiler Explorer: Behind The Scenes”

> But I wonder how common the knowledge is these days ... In one sense, it is less common, as you imply (though perhaps it's more that the number of high-level programmers have ballooned, rather than that the low-level ones have shrunk). In another sense, it's more accessible than ever, with tools like godbolt[1][2], VMs, cool profilers that show you a heatmap overlaid on assembly instructions, etc. And embedded development, where those details matter more, is still going strong, with IoT devices and so forth. [1] part of a presentation on it, if you're not already familiar: ▶ this video [2] the site itself: link

Indeed, for Matt Godbolt, and the whole community that has added the remaining AOT languages, .NET is one of the few missing from Compiler Explorer, but it has a similar one at link and there is one at link for GPGPU shaders. Here is one talk from Matt Godbolt about how Compiler Explorer was born, CppCon 2019: Matt Godbolt “Compiler Explorer: Behind The Scenes” ▶ this video

I recently watched the CppCon 2019 talk by Matt Godbolt "Compiler Explorer: Behind The Scenes"[1], and a cool feature he presented is the integrated LLVM Machine Code Analyser tool. If you look at the "timeline" and "resource" views of how a Zen 3 executes a typical assembly snippet, it is absolutely mind blowing. That beast of a CPU has so many resources it's just crazy. [1] ▶ this video

There's a few nice hidden features presented in Matt Godbolt's talk here: ▶ this video As for LLVM IR output, just use the right clang command line options: link Likewise for WASM: link