From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by sourceware.org (Postfix) with ESMTPS id 9C6523857C42 for ; Fri, 19 Nov 2021 21:54:53 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 9C6523857C42 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1AJLrgbn025575 for ; Fri, 19 Nov 2021 21:54:53 GMT Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3cem87809q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 19 Nov 2021 21:54:53 +0000 Received: from m0098420.ppops.net (m0098420.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1AJLsqge001669 for ; Fri, 19 Nov 2021 21:54:52 GMT Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0b-001b2d01.pphosted.com with ESMTP id 3cem87809h-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 19 Nov 2021 21:54:52 +0000 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1AJLqsr8032483; Fri, 19 Nov 2021 21:54:52 GMT Received: from b03cxnp08027.gho.boulder.ibm.com (b03cxnp08027.gho.boulder.ibm.com [9.17.130.19]) by ppma03dal.us.ibm.com with ESMTP id 3ca50edqqy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 19 Nov 2021 21:54:51 +0000 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1AJLsoF320578774 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 19 Nov 2021 21:54:50 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C9C89136059; Fri, 19 Nov 2021 21:54:50 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7EB1313604F; Fri, 19 Nov 2021 21:54:50 +0000 (GMT) Received: from [9.65.75.193] (unknown [9.65.75.193]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 19 Nov 2021 21:54:50 +0000 (GMT) Message-ID: <0a17063d-9c7b-718c-ddae-7a5d96016953@linux.ibm.com> Date: Fri, 19 Nov 2021 15:54:49 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.3.1 Subject: =?UTF-8?Q?Re=3a_How_to_describe_=e2=80=98earlyclobber=e2=80=99_expl?= =?UTF-8?Q?icitly_for_specific_source_operand_=3f?= Content-Language: en-US To: Jojo R , GCC Development References: <1b032580-97c7-41c5-9930-9a7354ae4151@Spark> From: Peter Bergner In-Reply-To: <1b032580-97c7-41c5-9930-9a7354ae4151@Spark> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: K-twB1_prWdOVl9uUh5Bwj65g7Scsznj X-Proofpoint-ORIG-GUID: o4oHYfizYBeM8Y0_emTyPVoubQW_5qTi X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-19_15,2021-11-17_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 mlxscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111190114 X-Spam-Status: No, score=-5.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Nov 2021 21:54:54 -0000 On 11/19/21 1:28 AM, Jojo R via Gcc wrote: > We know gcc supply earlyclobber function to avoid register overlap, > > but it can not describe explicitly for specific source operand, is it right ? You add the early clobber to the OUTPUT operand(s) that can clobber any of the input source operands. You don't mark the source operands that could be clobbered. Peter