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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/101861] [12 Regression] ICE (segfault) via
 tree-vect-stmts.c:9495's vectorizable_load
Date: Wed, 11 Aug 2021 08:40:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101861

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so we're having memory_access_type =3D=3D VMAT_GATHER_SCATTER, gs_info.=
ifn !=3D
IFN_LAST but STMT_VINFO_GATHER_SCATTER_P is false.  It looks like vec_offse=
t is
set elsewhere in that case.  Likely here:

  else if (memory_access_type =3D=3D VMAT_GATHER_SCATTER)
    {
      aggr_type =3D elem_type;
      vect_get_strided_load_store_ops (stmt_info, loop_vinfo, &gs_info,
                                       &bump, &vec_offset);
    }

so the fix is to re-instante the guard, doing

diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index ab402b57fb4..cc6c091e41e 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -9492,7 +9492,8 @@ vectorizable_load (vec_info *vinfo,
                    if (memory_access_type =3D=3D VMAT_GATHER_SCATTER
                        && gs_info.ifn !=3D IFN_LAST)
                      {
-                       vec_offset =3D vec_offsets[j];
+                       if (STMT_VINFO_GATHER_SCATTER_P (stmt_info))
+                         vec_offset =3D vec_offsets[j];
                        tree zero =3D build_zero_cst (vectype);
                        tree scale =3D size_int (gs_info.scale);
                        gcall *call;

will push this as obvious.=