https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49773

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |6.0
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
starting in GCC 6 can do it without aliasing checks.
Starting in GCC 8, the prologue code has improved.

So we can close this as fixed in GCC 6 really.

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