[Bug c/115539] Misoptimization of application at -O2 -g on x86-64 causing segfaults on valid memory accesses where it works on both clang and gcc at -g (no -O2)

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115539

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Your testcase isn't self-contained, there is no main, so there isn't much we
can do about it, but from the 220 -Wstrict-aliasing warnings I'd say it is very
likely the code violates TBAA just about everywhere.
Try -O2 -fno-strict-aliasing?  If that helps, most likely it is just bogus code
being compiled.