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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110539] [14 Regression] Dead Code Elimination
 Regression at since r14-338-g1dd154f6407
Date: Tue, 11 Jul 2023 23:13:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110539

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |110293

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
>   # RANGE [irange] int [0, 1] NONZERO 0x1
>   i_7 =3D a.0_1 & 1;
>=20
>   _17 =3D i_7 !=3D 0;
>   _12 =3D (int) _17;
>   if (i_7 =3D=3D _12)

Wait that is:
i_7 =3D=3D (convert) (i_7 !=3D 0);

Which is basically PR 110293. So there is another way of fixing this is
simplifying `i_7 =3D=3D (convert) (i_7 !=3D 0)` into  `(unsigned_type)i_7 <=
=3D 1` and
that is always true as `(a.0_1 & 1) <=3D 1` is always true.

Let me try fixing PR 110293 as the way of fixing this one instead of the pa=
tch
which I submitted but has other issues.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110293
[Bug 110293] Some `A CMP (A NEEQ 0)` is not simplified in some cases=