From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21830 invoked by alias); 22 Jun 2012 23:04:18 -0000 Received: (qmail 21797 invoked by uid 22791); 22 Jun 2012 23:04:17 -0000 X-SWARE-Spam-Status: No, hits=-3.4 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,RCVD_IN_DNSWL_NONE,RCVD_IN_HOSTKARMA_W,RCVD_IN_HOSTKARMA_WL,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from atrey.karlin.mff.cuni.cz (HELO atrey.karlin.mff.cuni.cz) (195.113.26.193) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 22 Jun 2012 23:04:04 +0000 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 4018) id 6D0D2F0721; Sat, 23 Jun 2012 01:04:03 +0200 (CEST) Date: Fri, 22 Jun 2012 23:04:00 -0000 From: Jan Hubicka To: hubicka at ucw dot cz Cc: gcc-bugs@gcc.gnu.org Subject: Re: [Bug tree-optimization/53726] [4.8 Regression] aes test performance drop for eembc_2_0_peak_32 Message-ID: <20120622230403.GC19193@atrey.karlin.mff.cuni.cz> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) X-IsSubscribed: yes 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: 2012-06/txt/msg01547.txt.bz2 > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53726 > > --- Comment #22 from Jan Hubicka 2012-06-22 22:45:35 UTC --- > > Yes. The question is what is "very small" and how can we possibly > > As what is very small is defined in the i386.c in the cost tables. > I simply run a small benchmark testing library&GCC implementations to > fill it in. With new glibcs these tables may need upating. I updated them > on some to make glibc in SUSE 11.x. > > PR 43052 is about memcmp. Memcpy/memset should behave more or less sanely. > (that also reminds me that I should look again at the SSE memcpy/memset > implementation for 4.8) That also reminds me that this tunning was mostly reverted with the SSE work. I will look into that patches and push out the safe bits for 4.8 Honza