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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/104644] [12 Regression] ICE: SIGSEGV
 (infinite recursion in fold_binary_loc / fold_build2_loc /
 generic_simplify_NE_EXPR)
Date: Wed, 23 Feb 2022 08:27:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104644

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the FEs rely on such trees not being folded.
It is done in fold-const-call.cc,
1186    static tree
1187    fold_const_call_1 (combined_fn fn, tree type, tree arg)
1188    {
1189      machine_mode mode =3D TYPE_MODE (type);
1190      machine_mode arg_mode =3D TYPE_MODE (TREE_TYPE (arg));
1191=20=20=20=20
1192      if (integer_cst_p (arg))
1193        {
and integer_cst_p does:
35      /* Functions that test for certain constant types, abstracting away=
 the
36         decision about whether to check for overflow.  */
37=20=20=20=20=20=20
38      static inline bool
39      integer_cst_p (tree t)
40      {
41        return TREE_CODE (t) =3D=3D INTEGER_CST && !TREE_OVERFLOW (t);
42      }=