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 661643858C50 for ; Sat, 18 Mar 2023 03:53:22 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 661643858C50 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linux.ibm.com Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 32I3LEKQ031774; Sat, 18 Mar 2023 03:53:21 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=message-id : date : subject : to : cc : references : from : in-reply-to : content-type : content-transfer-encoding : mime-version; s=pp1; bh=RJYtFvh9CohztOrHlW/Fqw7iAG0f+rTcfAOxqivIGQ0=; b=CJQkFzy0ip8wJY+tpXsguHo9pBtX6hleHi5Q440sf9DJtC4T8j6wF3lmCNy5E9i9onsv 3CfjRW2pNHvSj3aJ2rwbh2OcrZErOwAl++4R6KooqOxDVgQh8/KzhpXMVBSK6KSe69ef 0MM9niXUvJnSfVPN21MsR9yRaV39r/Ptb3q6pkDUR3LCIn2cqcrhZ00XxAtrQjV6wa2Z o+Bn9EEdf+/ALFpVyMfGIwjXI0vr33fgMzEDiAk87ai3hBoqfTTBL8A6ShX+C6IqoHse FRaBEyh2gdFv3ymqGjxaAkiyUte1To77yq9p5uaUoEnw1RI+Y+KaKXRZDWCfqBEQ3TTO kg== Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0b-001b2d01.pphosted.com (PPS) with ESMTPS id 3pd5ab8dxd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 18 Mar 2023 03:53:21 +0000 Received: from pps.filterd (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 32I2t98b020716; Sat, 18 Mar 2023 03:53:20 GMT Received: from smtprelay03.wdc07v.mail.ibm.com ([9.208.129.113]) by ppma02wdc.us.ibm.com (PPS) with ESMTPS id 3pd4x6g793-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 18 Mar 2023 03:53:20 +0000 Received: from smtpav02.dal12v.mail.ibm.com (smtpav02.dal12v.mail.ibm.com [10.241.53.101]) by smtprelay03.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 32I3rIWG3015358 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 18 Mar 2023 03:53:19 GMT Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A06415805A; Sat, 18 Mar 2023 03:53:18 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3930558066; Sat, 18 Mar 2023 03:53:18 +0000 (GMT) Received: from [9.211.90.110] (unknown [9.211.90.110]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Sat, 18 Mar 2023 03:53:18 +0000 (GMT) Message-ID: Date: Fri, 17 Mar 2023 22:53:17 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.9.0 Subject: Re: [PATCH] rs6000: suboptimal code for returning bool value on target ppc Content-Language: en-US To: Surya Kumari Jangala , Ajit Agarwal , gcc-patches Cc: Segher Boessenkool References: <86cf8475-4353-52ca-869c-75f40bd7d06f@linux.ibm.com> <38952348-21a7-c275-a2f7-3a0abbca7c9d@linux.vnet.ibm.com> <4bd74349-4ce3-515f-3ddd-37698639130e@linux.ibm.com> From: Peter Bergner In-Reply-To: <4bd74349-4ce3-515f-3ddd-37698639130e@linux.ibm.com> Content-Type: text/plain; charset=UTF-8 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Qc4YcQT2jrNb1dm70VGVEjEa5Uolk2PG X-Proofpoint-GUID: Qc4YcQT2jrNb1dm70VGVEjEa5Uolk2PG Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-17_20,2023-03-16_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 bulkscore=0 mlxlogscore=999 impostorscore=0 phishscore=0 malwarescore=0 priorityscore=1501 spamscore=0 mlxscore=0 lowpriorityscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303150002 definitions=main-2303180031 X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,KAM_SHORT,NICE_REPLY_A,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 3/17/23 4:20 PM, Peter Bergner via Gcc-patches wrote: > On 3/16/23 10:37 PM, Surya Kumari Jangala wrote: >> The issue of suboptimal code exists even for integer return value and not just bool return value. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103784#c9 >> So the patch would need to take care of integer return values too. > > Correct. Basically any time we return an integral type (signed or unsigned) > type is smaller than the hard register we are returning it in, we can get these > unwanted sign/zero extensions. I'm sorry, I didn't mean to imply every sign and zero extend is useless. I just meant to say that there are many cases when these sign and zero extends are not necessary. Peter