From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by sourceware.org (Postfix) with ESMTP id 6FAC63945C26 for ; Tue, 24 Nov 2020 15:23:47 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 6FAC63945C26 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-26-8qCh40KyOme5wG95uh65dQ-1; Tue, 24 Nov 2020 10:23:43 -0500 X-MC-Unique: 8qCh40KyOme5wG95uh65dQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DC81A84639D; Tue, 24 Nov 2020 15:23:41 +0000 (UTC) Received: from localhost.localdomain (ovpn-113-152.phx2.redhat.com [10.3.113.152]) by smtp.corp.redhat.com (Postfix) with ESMTP id 617891001B2C; Tue, 24 Nov 2020 15:23:41 +0000 (UTC) Subject: Re: H8 cc0 conversion To: Eric Botcazou , Hans-Peter Nilsson Cc: gcc-patches@gcc.gnu.org References: <97ecedff-d840-a5cc-8178-39ce8e2175c5@redhat.com> <61fe31f6-bfb0-6adc-6f5b-dc7dca1e8634@redhat.com> <7763357.gu0YAMHDHY@fomalhaut> From: Jeff Law Message-ID: <3c939688-c54f-c7de-e563-2c4d1a6d3c49@redhat.com> Date: Tue, 24 Nov 2020 08:23:41 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 MIME-Version: 1.0 In-Reply-To: <7763357.gu0YAMHDHY@fomalhaut> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Spam-Status: No, score=-5.5 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Nov 2020 15:23:48 -0000 On 11/24/20 4:08 AM, Eric Botcazou wrote: >> I'm intested in any notes, however vague, on that matter. I was >> a bit surprised to see that myself...that is, after fixing >> *some* related regressions, like the one in combine. (Did I >> actually miss something?) > My recollection for the Visium port would align with what Jeff saw but, on the > other hand, this could have been very marginal a phenomenon in the end. I never tried to quantify it myself.  I certainly saw improvements dropping the unnecessary clobbers from the shifting patterns on the H8 independently of the cc0 converseion. jeff