https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67979
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The code is undefined if NULL is passed and that is why the branch is removed.
If you don't want this optimization then use -fno-delete-null-pointer-checks
