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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/111903] [14 Regression] ICE: tree check: expected class
 'type', have 'exceptional' (error_mark) in create_tmp_from_val, at
 gimplify.cc:567 with -mno-sse2 and _Float16
Date: Fri, 20 Oct 2023 21:03:34 +0000
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X-Bugzilla-Keywords: error-recovery, ice-checking, ice-on-invalid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111903

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Target Milestone|---                         |14.0
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org
   Last reconfirmed|                            |2023-10-20
           Keywords|                            |error-recovery,
                   |                            |ice-checking
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  if ((invalid_conv_diag
       =3D targetm.invalid_conversion (TREE_TYPE (expr), type)))
    {
      error (invalid_conv_diag);
      return error_mark_node;
    }


So this is a C front-end issue not expecting error_mark_node in some cases.

Looking into it further.=