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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103704] [12 Regression] ICE: tree check: expected class
 'type', have 'exceptional' (tree_vec) in operand_equal_p, at
 fold-const.c:3011 since r12-5835-g0ab29cf0bb68960c
Date: Tue, 14 Dec 2021 14:43:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103704

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gn=
u.org
             Status|NEW                         |ASSIGNED

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 51998
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51998&action=3Dedit
gcc12-pr103704.patch

operand_equal_p in checking mode attempts to compute hashes and is unhappy
about OMP_CLAUSE abusing TREE_TYPE of it for the ctor/dtor etc. info.

Easiest seems to be for OMP_CLAUSE to just walk subtrees but not the OMP_CL=
AUSE
itself.  The walking of the body seems quite dangerous even with that change
though, but don't have a testcase that proves a problem though.=