From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by sourceware.org (Postfix) with ESMTPS id BD2DE38582BE for ; Wed, 8 Jun 2022 14:58:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org BD2DE38582BE Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 258Dg4Df008471; Wed, 8 Jun 2022 14:58:15 GMT Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3gjvvm1q2d-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Jun 2022 14:58:15 +0000 Received: from m0098394.ppops.net (m0098394.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 258Dh5pX016274; Wed, 8 Jun 2022 14:58:14 GMT Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3gjvvm1q22-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Jun 2022 14:58:14 +0000 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 258EohIY010512; Wed, 8 Jun 2022 14:58:13 GMT Received: from b03cxnp08027.gho.boulder.ibm.com (b03cxnp08027.gho.boulder.ibm.com [9.17.130.19]) by ppma01dal.us.ibm.com with ESMTP id 3gfy1aavs6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Jun 2022 14:58:13 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 258EwCS813763060 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 8 Jun 2022 14:58:12 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2F611C6055; Wed, 8 Jun 2022 14:58:12 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 39A19C6059; Wed, 8 Jun 2022 14:58:11 +0000 (GMT) Received: from [9.160.110.162] (unknown [9.160.110.162]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 8 Jun 2022 14:58:11 +0000 (GMT) Message-ID: <05f84479-3944-3261-86a7-87c74cae2902@linux.ibm.com> Date: Wed, 8 Jun 2022 09:58:10 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH 1/3] Disable generating store vector pair. Content-Language: en-US To: Michael Meissner , Segher Boessenkool , gcc-patches@gcc.gnu.org, "Kewen.Lin" , David Edelsohn , Will Schmidt References: <20220607212419.GM25951@gate.crashing.org> <85479b53-7c81-1bda-e63d-33497accc58e@linux.ibm.com> From: Peter Bergner In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: vD2zK0BY424RyB7KebDIBhCB4OKwAuG- X-Proofpoint-ORIG-GUID: fvCRYwd0IYCM37i4-Tx8oNELWaapKCII X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-08_05,2022-06-07_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 malwarescore=0 phishscore=0 priorityscore=1501 impostorscore=0 mlxscore=0 clxscore=1015 spamscore=0 suspectscore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206080063 X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) 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: Wed, 08 Jun 2022 14:58:18 -0000 On 6/7/22 10:16 PM, Michael Meissner wrote: > Otherwise it is like the mess with -mpower8-fusion, where going from power8 to > power9 we have to clear the fusion flag. If store vector pair is a postive > flag, then it isn't set in power10 flags, but it might be set in next cpu > flags. But if it is a negative flag, we have to explicitly clear it. Ok, I completely forgot about this specific issue and its negative affect on inlining, so I agree it's a bad idea. Request withdrawn. :-) Peter