From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 77664 invoked by alias); 3 Mar 2015 15:05:05 -0000 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 Received: (qmail 77574 invoked by uid 48); 3 Mar 2015 15:05:02 -0000 From: "dje at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug testsuite/63175] [4.9/5 regression] FAIL: gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c scan-tree-dump-times slp2" basic block vectorized using SLP" 1 Date: Tue, 03 Mar 2015 15:05:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: testsuite X-Bugzilla-Version: 4.9.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dje at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.9.3 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-03/txt/msg00315.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63175 --- Comment #27 from David Edelsohn --- The vector alignment cost varies with processor implementation, not defined by the architecture. Bill has a patch that adjusts unaligned vector cost for POWER8, which may affect this. Because this PR depends on the cost model, this may vary with processor. Because of the change in cost model usage between 4.8 and 4.9, the code generation will change. On the other hand, the vectorizer tuning is encoding x86 preferences.