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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98849] [11 Regression] ICE in expand_shift_1, at
 expmed.c:2658 since g:7432f255b70811dafaf325d9403
Date: Wed, 27 Jan 2021 11:28:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98849

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
tree-vect-generic.c claims that
          /* The rtl expander will expand vector/scalar as vector/vector
             if necessary.  Pick one with wider vector type.  */
but that doesn't seem to be the case (at least on this testcase and this
target).
I only see the vashl* used if:
  /* Determine whether the shift/rotate amount is a vector, or scalar.  If =
the
     shift amount is a vector, use the vector/vector shift patterns.  */
  if (VECTOR_MODE_P (mode) && VECTOR_MODE_P (op1_mode))
    {
      lshift_optab =3D vashl_optab;
      rshift_arith_optab =3D vashr_optab;
      rshift_uns_optab =3D vlshr_optab;
      lrotate_optab =3D vrotl_optab;
      rrotate_optab =3D vrotr_optab;
    }=20=20=20=20

So, shall tree-vect-generic.c stop relying on that and broadcast the scalar
shift to vector if vector x vector but not vector x scalar shift/rotate is
supported?
Or shall expmed.c do the broadcast?
Or are targets required to support the vector x scalar shift/rotate optabs =
if
they do support vector x vector?=