From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-381194-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 30322 invoked by alias); 25 Jan 2012 09:47:17 -0000
Received: (qmail 30312 invoked by uid 22791); 25 Jan 2012 09:47:16 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 25 Jan 2012 09:46:55 +0000
From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/51879] Missed tail merging with non-const/pure calls
Date: Wed, 25 Jan 2012 10:10:00 -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-Keywords:
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: vries at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: vries at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: Attachment #26430 is obsolete
Message-ID: <bug-51879-4-GNQqQDr4xK@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-51879-4@http.gcc.gnu.org/bugzilla/>
References: <bug-51879-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-01/txt/msg02869.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879

vries at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #26430|0                           |1
        is obsolete|                            |

--- Comment #7 from vries at gcc dot gnu.org 2012-01-25 09:46:52 UTC ---
Created attachment 26454
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26454
Updated tentative patch

This patch was bootstrapped and reg-tested on x86_64, and fails only in 3 tests
- gcc.c-torture/compile/20030224-1.c
- gcc.c-torture/execute/20020412-1.c
- gcc.dg/lto/20090706-1_0.c
on ICE from PR51990.

2012-01-25  Tom de Vries  <tom@codesourcery.com>

    PR tree-optimization/51879
    * tree-ssa-sccvn.h (struct vn_reference_s): Add vdef field.
    * tree-ssa-sccvn.c (visit_reference_op_call): Handle gimple_vdef.
    Handle case that lhs is NULL_TREE.
    (visit_use): Handle non-pure/const calls and calls without result using
    visit_reference_op_call.

    gcc.dg/pr51879.c: New test.
    gcc.dg/pr51879-2.c: Same.
    gcc.dg/pr51879-3.c: Same.
    gcc.dg/pr51879-4.c: Same.
    gcc.dg/pr51879-6.c: Same.