From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 8E9963858406; Mon, 22 Nov 2021 14:24:03 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8E9963858406
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103168] Value numbering for PRE of pure
 functions can be improved
Date: Mon, 22 Nov 2021 14:24:03 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-103168-4-G348lJEcIf@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-103168-4@http.gcc.gnu.org/bugzilla/>
References: <bug-103168-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Nov 2021 14:24:03 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103168

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
And interestingly for

unsigned p;
unsigned __attribute__((noinline)) test (void)
{
  return p;
}

I do not get any modref summary!?

;; Function test (test, funcdef_no=3D0, decl_uid=3D1979, cgraph_uid=3D1,
symbol_order=3D1)

modref analyzing 'test' (ipa=3D0) (pure)
 - Analyzing load: p
   - Recording base_set=3D0 ref_set=3D0
 - modref done with result: tracked.
__attribute__((noinline))
unsigned int test ()
{
  unsigned int _2;

  <bb 2> [local count: 1073741824]:
  _2 =3D p;
  return _2;

}=