From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14272 invoked by alias); 21 Jul 2010 18:27:11 -0000 Received: (qmail 14210 invoked by uid 48); 21 Jul 2010 18:27:00 -0000 Date: Wed, 21 Jul 2010 18:27:00 -0000 Message-ID: <20100721182700.14209.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug tree-optimization/45021] Redundant prefetches for the vectorized loop In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "changpeng dot fang at amd dot com" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2010-07/txt/msg02255.txt.bz2 ------- Comment #1 from changpeng dot fang at amd dot com 2010-07-21 18:26 ------- The direct reason is that prefetching could not differentiate the base addresses of the vectorized load and store (of a[i]): *vect_pa.6_24 *vect_pa.19_37 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45021