From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14158 invoked by alias); 2 Mar 2012 07:12:08 -0000 Received: (qmail 14063 invoked by uid 22791); 2 Mar 2012 07:12:06 -0000 X-SWARE-Spam-Status: No, hits=-2.8 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; Fri, 02 Mar 2012 07:11:50 +0000 From: "M8R-ynb11d at mailinator dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/52459] [x86] loop vectorization performance very bad (worse than -O0) when using sse4.2 popcnt Date: Fri, 02 Mar 2012 07:12:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: M8R-ynb11d at mailinator 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: 2012-03/txt/msg00185.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52459 --- Comment #1 from M8R-ynb11d at mailinator dot com 2012-03-02 07:11:47 UTC --- Similar (but much slower) results when not using SSE and using the libgcc library version of __builtin_popcount: -O0: 22.55 secs -O1: 20.57 secs -O2: 22.48 secs -Os: 22.81 secs -O3: 45.17 secs