https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105591
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.0
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-05-13
Ever confirmed|0 |1
CC| |liuhongt at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. The offset is very large negative, built by simplify_bitfield_ref
here:
2416 tem = build3 (BIT_FIELD_REF, TREE_TYPE (op),
2417 p, op1, bitsize_int (idx * elem_size));
(gdb) p idx
$11 = 13704120150654661628
because we have a non-sensical permute:
x_4 = VEC_PERM_EXPR <u_3(D), u_3(D), { 13704120150654661630, 0 }>;
some sanity checking in simplify_bitfield_ref might be in order. Rejecting the
__builtin_shuffle might be another option, it's surely going to cause issues
elsewhere.
