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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/108684] [12/13 Regression] ICE: verify_ssa
 failed
Date: Tue, 07 Feb 2023 19:59:19 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code, inline-asm, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108684

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #8)
> I think simple_dce_from_worklist is incorrect of removing this inline-asm=
 in
> the first place.
> Take:
> ```
> static int t;
>=20
> int f (int *a)
> {
>   int t1;
>   asm (" " : "=3Dr" (t1) : : "memory");
>   t =3D t1;
>   return *a;
> }
> ```
> The inline-asm could have written to *a but now it has been removed.

I think that is how inline asm always behaved.  If it is not ok to be DCEd =
when
the result is dead, one needs to use volatile keyword.=