Question about difference in assembly generation

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Hello,



First of all I’m not sure where I should ask this question so I’m using
this list. Please kindly direct me to the right place if asking here is not
appropriate.



I have a question regarding GCC's behavior with respect to tail call
optimization (TCO). I understand that the C++ standard does not mandate
TCO, but I'm curious about the specific conditions under which GCC applies
it in practice.



I have a scenario where I implement the same behaviour but one using an
RAII style

https://godbolt.org/z/1YTP591Eq



I’m surprised that there is an assembly generation difference which seems
related to TCO. I.E. there is a `call` instruction generated iso of a `jmp`



I would like to get some help understanding why there is such a difference.



Kind regards,




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