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Thank you both Andrey Turkin and Some programmer dude: stared myself blind on the part of the code I was interested in.

I don't think this was the actual source code that got compiled into this. This is more likely the result of the other compile-time option (hardware division enabled). Though I'm not exactly sure what ...

I recommend you first tell the compiler to give you the preprocessed source, so you see exactly how these macros are expanded. Then build without optimizations to see the "naive" assembly ...

Nominally, you can use the umonitor/umwait instructions on CPUs that have the WAITPKG bit set, namely Intel CPUs from the Tremont family and later, i.e. on servers Sapphire Rapids and later. However, ...