From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 120440 invoked by alias); 7 Sep 2015 12:57:51 -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 120366 invoked by uid 55); 7 Sep 2015 12:57:47 -0000 From: "graham.stott at btinternet dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/67438] [6 Regression] ~X op ~Y pattern relocation causes loop performance degradation on 32bit x86 Date: Mon, 07 Sep 2015 12:57:00 -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-Version: 6.0 X-Bugzilla-Keywords: missed-optimization, ra X-Bugzilla-Severity: normal X-Bugzilla-Who: graham.stott at btinternet dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- 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: 2015-09/txt/msg00501.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67438 --- Comment #8 from graham.stott at btinternet dot com --- Sent from Samsung Mobile on O2
-------- Original message --------
From: "afomin.mailbox at gmail dot com"
Date:07/09/2015 13:35 (GMT+00:00)
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/67438] [6 Regression] ~X op ~Y pattern relocation causes loop performance degradation on 32bit x86
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67438 --- Comment #7 from Alexander Fomin --- Looks like a cost model should be introduced to avoid such kind of transformations for targets with HW min/max implementation.