https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108599
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The bug is in ix86_convert_const_wide_int_to_broadcast. It is called with
OImode and
(const_wide_int 0x100000000000000010), that CONST_WIDE_INT is actually usable
as broadcast from DImode 0x10, but only to TImode, not OImode nor XImode.
/* Check if OP can be broadcasted from VAL. */
for (int i = 1; i < CONST_WIDE_INT_NUNITS (op); i++)
if (val != CONST_WIDE_INT_ELT (op, i))
return nullptr;
checks all elements of the CONST_WIDE_INT, but nothing checks that it has the
expected number of elements...
Note, 0 and -1 shouldn't happen here, those would be CONST_INT rather than
CONST_WIDE_INT and all the others have to use the right number of
CONST_WIDE_INT_NUNITS in order to be broadcastable.
