From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-335338-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 31437 invoked by alias); 1 Nov 2010 22:22:18 -0000
Received: (qmail 31428 invoked by uid 22791); 1 Nov 2010 22:22:17 -0000
X-SWARE-Spam-Status: No, hits=-2.4 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,MISSING_MID
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; Mon, 01 Nov 2010 22:22:13 +0000
From: "changpeng.fang at amd dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/45022] No prefetch for the vectorized loop
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: normal
X-Bugzilla-Who: changpeng.fang at amd dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: Status Resolution
In-Reply-To: <bug-45022-4@http.gcc.gnu.org/bugzilla/>
References: <bug-45022-4@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
Date: Mon, 01 Nov 2010 22:22:00 -0000
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: 2010-11/txt/msg00071.txt.bz2
Message-ID: <20101101222200.SyrlAof3FafHFgZnYAG-dCRwPruNCKMVjdR_SKmmvwg@z>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45022

Changpeng Fang <changpeng.fang at amd dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

--- Comment #6 from Changpeng Fang <changpeng.fang at amd dot com> 2010-11-01 22:21:56 UTC ---
Not surprise: Richard's check-in of the MISALIGNED_INDIRECT_REF removal
fixed the bug.

Surprise: only two prefetches are generated (which is right). However,
if we could align the references as the following case (PR 45021):

float a[1024], b[1024];
void foo(int beta)
{
  int i;
  for(i=0; i<1024; i++)
     a[i] = a[i] + beta * b[i];
}

Three prefetches will be generated, one for b, one for load a, and one for
store a.

Anyway, I am closing this bug, and we should work on PR 45021.