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From: "roger at nextmovesoftware dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/25186] (short)(((int)short_var) <<1) should be
 folded so that the shift is done in the short type
Date: Sat, 22 Apr 2023 08:06:50 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 4.2.0
X-Bugzilla-Keywords: easyhack, missed-optimization, TREE
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: roger at nextmovesoftware dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 13.0
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 cf_known_to_work
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D25186

Roger Sayle <roger at nextmovesoftware dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |13.0
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |roger at nextmovesoftware =
dot com
      Known to work|                            |13.0

--- Comment #10 from Roger Sayle <roger at nextmovesoftware dot com> ---
This is now fixed (at the tree level) on mainline (and was fixed in GCC 13).
For those wondering, LSHIFT_EXPR is well defined (in this case) in GIMPLE,
hence the "optimized" dump currently looks like:
void f ()
{
  short int * a.0_1;
  short int _2;
  short int _3;

  a.0_1 =3D a;
  _2 =3D *a.0_1;
  _3 =3D _2 << 1;
  *a.0_1 =3D _3;
  return;

}=