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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110556] [12/13/14 Regression] division of
 INT_MIN and -1 happening incorrectly with -fno-delete-dead-exceptions
 -fnon-call-exceptions
Date: Thu, 06 Jul 2023 11:45:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110556

Richard Biener <rguenth at gcc dot gnu.org> changed:

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

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is tail merging and I think we have a duplicate bug for this.

find_duplicates: <bb 5> duplicate of <bb 7>
Removing basic block 7
;; basic block 7, loop depth 0
;;  pred:
_27 =3D -9223372036854775808 / si2_15(D);
goto <bb 10>; [100.00%]

and we have

  <bb 4> [local count: 268435457]:
  _5 =3D si2_15(D) > 0;
  _6 =3D _1 | _5;
  if (_6 !=3D 0)
    goto <bb 6>; [20.00%]
  else
    goto <bb 5>; [80.00%]

  <bb 5> [local count: 214748365]:
  _13 =3D -9223372036854775808 / si1_14(D);
  goto <bb 10>; [100.00%]

  <bb 6> [local count: 301989889]:
  _7 =3D si1_14(D) > 0;
  _9 =3D _2 | _7;
  if (_9 !=3D 0)
    goto <bb 8>; [0.00%]
  else
    goto <bb 7>; [100.00%]

  <bb 7> [local count: 301989888]:
  _27 =3D -9223372036854775808 / si2_15(D);
  goto <bb 10>; [100.00%]

oddly enough gimple_equal_p looks strange:

    case GIMPLE_ASSIGN:
      lhs1 =3D gimple_get_lhs (s1);
      lhs2 =3D gimple_get_lhs (s2);
      if (TREE_CODE (lhs1) !=3D SSA_NAME
          && TREE_CODE (lhs2) !=3D SSA_NAME)
        return (operand_equal_p (lhs1, lhs2, 0)
                && gimple_operand_equal_value_p (gimple_assign_rhs1 (s1),
                                                 gimple_assign_rhs1 (s2)));
      else if (TREE_CODE (lhs1) =3D=3D SSA_NAME
               && TREE_CODE (lhs2) =3D=3D SSA_NAME)
        return operand_equal_p (gimple_assign_rhs1 (s1),
                                gimple_assign_rhs1 (s2), 0);

that looks pre-tuplish to me.=