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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108599] [12/13 Regression] Incorrect code generation
 newer intel architectures
Date: Mon, 30 Jan 2023 14:31:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108599

--- 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 usab=
le
as broadcast from DImode 0x10, but only to TImode, not OImode nor XImode.
  /* Check if OP can be broadcasted from VAL.  */
  for (int i =3D 1; i < CONST_WIDE_INT_NUNITS (op); i++)
    if (val !=3D CONST_WIDE_INT_ELT (op, i))
      return nullptr;
checks all elements of the CONST_WIDE_INT, but nothing checks that it has t=
he
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.=