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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113339] `-a/-b` is not simplified to `a/b` if
 done in seperate statements
Date: Thu, 11 Jan 2024 19:23:43 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113339

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-01-11

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is currently done only in fold:
```
      /* (-A) / (-B) -> A / B  */
      if (TREE_CODE (arg0) =3D=3D NEGATE_EXPR && negate_expr_p (arg1))
        return fold_build2_loc (loc, RDIV_EXPR, type,
                            TREE_OPERAND (arg0, 0),
                            negate_expr (arg1));
      if (TREE_CODE (arg1) =3D=3D NEGATE_EXPR && negate_expr_p (arg0))
        return fold_build2_loc (loc, RDIV_EXPR, type,
                            negate_expr (arg0),
                            TREE_OPERAND (arg1, 0));
      return NULL_TREE;
```

I am going to handle the simple cases for GCC 15 here ...=