https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118440
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So the zeroing at -O1 and above come from a pass which "initializes"
uninitialized registers.
*** This bug has been marked as a duplicate of bug 61810 ***
