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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103780] zero pointer is considered true
Date: Mon, 20 Dec 2021 20:03:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103780

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>a pointer that goes to 0 after decrement is still considered true.

Yes a pointer is never a null pointer if it is decremented and it was a val=
id
pointer to begin with.

Use -fno-delete-null-pointer-checks if you want to disable this optimizatio=
n.=