From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28043 invoked by alias); 3 Jan 2012 04:46:21 -0000 Received: (qmail 28033 invoked by uid 22791); 3 Jan 2012 04:46:20 -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; Tue, 03 Jan 2012 04:46:06 +0000 From: "solar-gcc at openwall dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/51017] GCC 4.6 performance regression (vs. 4.4/4.5) Date: Tue, 03 Jan 2012 04:46:00 -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: solar-gcc at openwall dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: 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/msg00179.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51017 --- Comment #4 from Alexander Peslyak 2012-01-03 04:45:43 UTC --- (In reply to comment #3) > It might be interesting to get numbers for the trunk. There have been some > register allocator fixes which might have improved this. I've just tested the gcc-4.7-20111231 snapshot vs. 4.6.2 release. There's no improvement as it relates to this issue: I am getting the same poor performance (a lot worse than for 4.5). This is for generating x86-64 code with SSE2 intrinsics, benchmarking the resulting code on a Core 2'ish CPU (I used Xeon E5420 this time).