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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/111268] [14 Regression] internal compiler
 error: in to_constant, at poly-int.h:504
Date: Tue, 17 Oct 2023 12:48:37 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: ice-on-valid-code, needs-bisection
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111268

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, we have

(gdb) p debug (node)
t.c:3:6: note: node 0x3f341d0 (max_nunits=3D1, refcnt=3D1) vector(2) long u=
nsigned
int
t.c:3:6: note: op: VEC_PERM_EXPR
t.c:3:6: note:  stmt 0 _1 =3D BIT_FIELD_REF <values_7(D), 64, 0>;
t.c:3:6: note:  stmt 1 _4 =3D BIT_FIELD_REF <values_7(D), 64, 64>;
t.c:3:6: note:  lane permutation { 0[0] 0[1] }
t.c:3:6: note:  children 0x3f34260
$1 =3D void
(gdb) p vtype
$2 =3D <vector_type 0x7ffff6ca6bd0 svuint64_t>

it looks like "compatibility" somehow requires/allows us to V_C_E the
permuted argument to a fixed length vector?  Otherwise vect_build_slp_tree_1
of course could check the BIT_FIELD_REF args are fixed length.=