-fomit-frame-pointer is pretty high on the list of most destructive micro-optimizations in the history of open source. When you repurpose the backtrace pointer (RBP) for other things, it totally savages our ability to have native backtraces

Funny. I always learned that the *BP registers stood for Base Pointer and not Backtrace. And then I would use BP to reference function temp variables from that part of the call frame.

The Intel “ASM86 Language Reference Manual” calls it that as well.

https://community.intel.com/cipcp26785/attachments/cipcp2678...