From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-248637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 9945 invoked by alias); 28 Mar 2008 13:41:29 -0000
Received: (qmail 9673 invoked by uid 48); 28 Mar 2008 13:40:27 -0000
Date: Fri, 28 Mar 2008 13:41:00 -0000
Message-ID: <20080328134027.9671.qmail@sourceware.org>
X-Bugzilla-Reason: CC
References: <bug-19580-7958@http.gcc.gnu.org/bugzilla/>
Subject: [Bug rtl-optimization/19580] [4.1/4.2/4.3 Regression] missed load/store motion
In-Reply-To: <bug-19580-7958@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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: 2008-03/txt/msg02263.txt.bz2



------- Comment #38 from rguenth at gcc dot gnu dot org  2008-03-28 13:40 -------
Fixed in GCC 4.4 with the store-motion rewrite to use an alias-oracle:

<bb 3>:
  r_I_lsm.18 = r[5];
  r_I_lsm.13 = r[0];
  r_I_lsm.14 = r[1];
  r_I_lsm.15 = r[2];
  r_I_lsm.16 = r[3];
  r_I_lsm.17 = r[4];
  r_I_lsm.27 = r_I_lsm.18;

<bb 4>:
  r_I_lsm.13 = r_I_lsm.13 + r_I_lsm.27;
  r_I_lsm.14 = r_I_lsm.14 + r_I_lsm.13;
  r_I_lsm.15 = r_I_lsm.14 + r_I_lsm.15;
  r_I_lsm.16 = r_I_lsm.15 + r_I_lsm.16;
  r_I_lsm.17 = r_I_lsm.16 + r_I_lsm.17;
  r_I_lsm.18 = r_I_lsm.17 + r_I_lsm.18;
  n.26 = n.26 + -1;
  r_I_lsm.28 = r_I_lsm.27;
  r_I_lsm.27 = r_I_lsm.18;
  if (n.26 != 0)
    goto <bb 4>;
  else
    goto <bb 5>;

<bb 5>:
  r_I_lsm.27 = r_I_lsm.28;
  r[0] = r_I_lsm.13;
  r[1] = r_I_lsm.14;
  r[2] = r_I_lsm.15;
  r[3] = r_I_lsm.16;
  r[4] = r_I_lsm.17;
  r[5] = r_I_lsm.18;

I'll add a testcase to the testsuite.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|3.3.3 2.95.3 3.0.4 3.2.3    |3.3.3 2.95.3 3.0.4 3.2.3
                   |                            |4.4.0
            Summary|[4.1/4.2/4.3/4.4 Regression]|[4.1/4.2/4.3 Regression]
                   |missed load/store motion    |missed load/store motion


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19580