Comment # 1 on bug 1216000 from Richard Biener

Both -Og and even more so -O1 can end up eliminating variables and thus make
debugging harder.  -Og is "optimize but watch out for debugging", that's of
course more difficult to debug than -O0 "do not optimize".

So it works like designed - whether in your case I can't tell because you
didn't provide a testcase.  Note that the result of some_function_of_mine
is in %rax only, if that's not preserved somewhere else and the register
is clobbered (it doesn't have to be preserved across calls) then this is
the answer why it doesn't work when optimizing.  When not optimizing
'result' is placed on the stack.