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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/95576] [11 Regression] -fcompare-debug failure with -O3
 -fno-tree-forwprop -fvect-cost-model=unlimited
Date: Wed, 10 Jun 2020 13:12:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95576

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's also odd vectorization.

t.c:14:3: note:   Detected interleaving store this_3(D)->D.2378._vptr.S and
_1->_vptr.S
t.c:14:3: note:   Queuing group with duplicate access for fixup
t.c:14:3: missed:   not consecutive access _6 =3D _1->s;
t.c:14:3: note:   Detected interleaving store of size 1
t.c:14:3: note:         this_3(D)->D.2378._vptr.S =3D &MEM <int (*) ()[5]> =
[(void
*)&_ZTV1T + 16B];
t.c:14:3: note:   Detected interleaving store of size 1
t.c:14:3: note:         _1->_vptr.S =3D &MEM <int (*) ()[5]> [(void *)&_ZTV=
1S +
16B];

so we split the group into two of size one and vectorizing with V1DImode.  =
But
that's something else to fix I guess.=