From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24784 invoked by alias); 25 May 2013 04:03:58 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 24731 invoked by uid 89); 25 May 2013 04:03:53 -0000 X-Spam-SWARE-Status: No, score=-3.3 required=5.0 tests=AWL,BAYES_00,FREEMAIL_FROM,KHOP_THREADED,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE,SPF_PASS autolearn=ham version=3.3.1 Received: from mail-vb0-f42.google.com (HELO mail-vb0-f42.google.com) (209.85.212.42) by sourceware.org (qpsmtpd/0.84/v0.84-167-ge50287c) with ESMTP; Sat, 25 May 2013 04:03:53 +0000 Received: by mail-vb0-f42.google.com with SMTP id w15so3214456vbf.1 for ; Fri, 24 May 2013 21:03:51 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.58.137.200 with SMTP id qk8mr7190383veb.54.1369454631634; Fri, 24 May 2013 21:03:51 -0700 (PDT) Received: by 10.220.175.131 with HTTP; Fri, 24 May 2013 21:03:51 -0700 (PDT) In-Reply-To: <20130521234717.GA27879@ibm-tiger.the-meissners.org> References: <20130520204053.GA21090@ibm-tiger.the-meissners.org> <20130521234717.GA27879@ibm-tiger.the-meissners.org> Date: Sat, 25 May 2013 04:03:00 -0000 Message-ID: Subject: Re: [PATCH, rs6000] power8 patches, patch #4, new power8 builtins From: David Edelsohn To: Michael Meissner , GCC Patches , Pat Haugen , Peter Bergner Content-Type: text/plain; charset=ISO-8859-1 X-SW-Source: 2013-05/txt/msg01554.txt.bz2 On Tue, May 21, 2013 at 7:47 PM, Michael Meissner wrote: > * config/rs6000/rs6000.c (rs6000_option_override_internal): Only > allow power8 quad mode in 64-bit. Turn off splitting wide types > if we have quad mode. Completely turning off splitting wide types seems like an unnecessarily large hammer to prevent splitting a value across registers within logical atomic operations. I think we need to examine other alternatives. - David