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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/106027] [11/12/13 Regression] ICE:
 'verify_gimple' failed (error: mismatching comparison operand types) since
 r11-2450-g10231958fcfb13bc
Date: Mon, 20 Jun 2022 11:40:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106027

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the issue seems to be that

#4  0x0000000000f82be3 in fold_binary_loc (loc=3D2147483656,=20
    code=3DTRUTH_ANDIF_EXPR, type=3D<integer_type 0x7ffff68dd690 unsigned i=
nt>,=20
    op0=3D<nop_expr 0x7ffff6a0f240>, op1=3D<nop_expr 0x7ffff6a0f220>)
    at /space/rguenther/src/gcc/gcc/fold-const.cc:12044
      /* A < X && A + 1 > Y =3D=3D> A < X && A >=3D Y.  Normally A + 1 > Y
         means A >=3D Y && A !=3D MAX, but in this case we know that
         A < X <=3D MAX.  */

      if (!TREE_SIDE_EFFECTS (arg0)
          && !TREE_SIDE_EFFECTS (arg1))
        {
          tem =3D fold_to_nonsharp_ineq_using_bound (loc, arg0, arg1);
          if (tem && !operand_equal_p (tem, arg0, 0))
            return fold_build2_loc (loc, code, type, tem, arg1);

          tem =3D fold_to_nonsharp_ineq_using_bound (loc, arg1, arg0);
          if (tem && !operand_equal_p (tem, arg1, 0))
            return fold_build2_loc (loc, code, type, arg0, tem);

builds unsigned type TRUTH_ANDIF_EXPR with signed type arg0/tem (op0/op1
are conversions to unsigned type).  The offending revision just chokes
on the invalid input.=