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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101639] vectorization with bool reduction
Date: Tue, 18 Jun 2024 06:25:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101639

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-07-27 00:00:00         |2024-6-18
                 CC|                            |rguenth at gcc dot gnu.org,
                   |                            |rsandifo at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Re-confirmed.  To recap:

t.c:4:21: note:   =3D=3D=3D vect_determine_precisions =3D=3D=3D
t.c:4:21: note:   using normal nonmask vectors for r_14 =3D PHI <_8(6), 1(5=
)>
t.c:4:21: note:   using boolean precision 8 for _4 =3D _3 !=3D 0;
t.c:4:21: note:   using boolean precision 8 for _8 =3D _4 & r_14;
...
t.c:4:21: note:   =3D=3D> examining phi: r_14 =3D PHI <_8(6), 1(5)>
t.c:4:21: note:   get vectype for scalar type:  bool
t.c:4:21: note:   vectype: vector(16) unsigned char
..
t.c:4:21: note:   =3D=3D> examining statement: _4 =3D _3 !=3D 0;
t.c:4:21: note:   vectype: vector(16) <signed-boolean:8>
t.c:4:21: note:   nunits =3D 16
t.c:4:21: note:   =3D=3D> examining statement: _8 =3D _4 & r_14;
t.c:4:21: note:   vectype: vector(16) <signed-boolean:8>
t.c:4:21: note:   nunits =3D 16

that doesn't match up.  The solution might be to realize _8 is live and
thus needed as nonmask.=