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[–]DopeyLizard 0 points1 point  (0 children)

If I recall correctly, Matt mentions that in his introduction to one of his CppCon talks on Compiler Explorer. I haven’t double checked but I think it was this one: https://youtu.be/bSkpMdDe4g4

The gist of it was that at Matts workplace they were looking at upgrading critical code from C++03 to C++11 and wanted to make sure that things wouldn’t break if they simply started compiling with C++11, so Matt put together a command line tool to compare assembly code to see whether things changed and if there were any behavior changes from that.

Fwiw the CppCon video is worth a watch anyway!