From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28893 invoked by alias); 15 Jan 2012 08:06:52 -0000 Received: (qmail 28879 invoked by uid 22791); 15 Jan 2012 08:06:49 -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; Sun, 15 Jan 2012 08:06:37 +0000 From: "irar at il dot ibm.com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/51848] GCC is not able to vectorize when a constant value is also added to the sum of array expression inside a loop. Date: Sun, 15 Jan 2012 08:49:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: irar at il dot ibm.com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: CC Message-ID: In-Reply-To: References: 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: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2012-01/txt/msg01658.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51848 Ira Rosen changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |irar at il dot ibm.com --- Comment #2 from Ira Rosen 2012-01-15 08:06:09 UTC --- We don't recognize this as reduction because we look for: a1 = phi < a0, a2 > a3 = ... a2 = operation (a3, a1) and here we have a1 = phi < a0, a2 > a3 = ... a4 = operation (a3, a1) a2 = a4 + 1