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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114779] __builtin_constant_p does not work in
 inline functions
Date: Fri, 19 Apr 2024 09:03:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114779

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It isn't about side-effects.  It is about it having pointer type.
If you change your testcase to
    uintptr_t psfr_int =3D (uintptr_t) psfr;
    if (! __builtin_constant_p (psfr_int))
       ....
then it will work.
__builtin_constant_p ((uintptr_t) psfr) will not work though, because the
folding strips casts and the POINTER_TYPE_P case triggers in that case as w=
ell.
I am not sure it would be a good idea to change the __builtin_constant_p
behavior at this point, a lot of code in the wild might depend on its curre=
nt
behavior.=