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From: "acsawdey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96791] ICE in convert_mode_scalar, at expr.c:412
Date: Fri, 28 Aug 2020 00:58:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96791

acsawdey at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |acsawdey at gcc dot=
 gnu.org

--- Comment #5 from acsawdey at gcc dot gnu.org ---
Nope, this is my patch that added vector pair to memcpy/memmove expansion. =
We
apparently don't have the right patterns defined for this to extract things
from the POImode reg that it uses.

This is the code in expr.c:

  if (GET_MODE_CLASS (from_mode) =3D=3D MODE_PARTIAL_INT)
    {
      rtx new_from;
      scalar_int_mode full_mode
        =3D smallest_int_mode_for_size (GET_MODE_BITSIZE (from_mode));
      convert_optab ctab =3D unsignedp ? zext_optab : sext_optab;
      enum insn_code icode;

      icode =3D convert_optab_handler (ctab, full_mode, from_mode);
      gcc_assert (icode !=3D CODE_FOR_nothing);

convert_optab_handler doesn't find anything to go from POImode to DImode, so
the assert fires.=