[Bug tree-optimization/47815] Tail call regression with GCC snapshot

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47815

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.02.19 11:25:54
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-02-19 11:25:54 UTC ---
Confirmed.  In 4.6 we have noreturn discovery which figures out that
tail_call0 and tail_call1 do not return.  Then this causes us to not
apply tailcall optimization _by design_ to provide accurate backtraces
for noreturn functions which are usually especially used for debugging.

You can simulate the same effect with GCC 4.5 by adding noreturn
in addition to the noinline attribute.

I think we are not going to fix this because it is a feature and not a bug.