From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12olkn2039.outbound.protection.outlook.com [40.92.22.39]) by sourceware.org (Postfix) with ESMTPS id 7A418385802A for ; Fri, 15 Oct 2021 00:30:20 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 7A418385802A ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=mmGfMQr9WpXl20VRTHL6UZn8ZPdkZoib4dcJ9KLEm7i7WK0Q40tWKae3Ra9Z/yQkUygpDjLYQ/X66CqG4MQDo/RWMZqVfxsu5a9+spgSwosjw7SE9H6NPEHxqgPUPDqNY0iR+UO1kFM/9Jdklnsvmpdfs6BTfDY5xtyB1albQ2hVt8smesgXGe6GGfM1Hsr3iI750zC4hk2hMmLtd1/+YuWRTDv2btOn+tYptz7BjA4UQAr1HugjaLC92zqjTS3U7u3iYjjeaE7+xiG8JrWRhOs+K6PSM6BWOFvSP+BPtTRs0ebfVXvVqjyM2LKoHzf6Tf1fxnLUiLRbv7hoRWOpRA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Y88XOroCBEPUBd66ksgJO72nSpz4tXBNMsVlmdbMqZc=; b=DT3aYiLNggbXriIjZPeidIvm8YnUb7b4B3zigEK+SvCshGRqO65dXrD+NzqS++D2phuDYuRVqot7lqBEPtEwrPJGjo+Y6gJAtABK2Kro6IdrZNR705tB17lvR1vcLsS5Kka0Efbnt6mBN3UoIWBU4gZJjTCJlv7pYZSsqnowtYgN7wNKP7XtiROS6nBs0iuE7YgFY1ebPcL7jYjpV8DEl8s/oqwS0F5QfStA1FH6Qh7Ng7c4hHGz5vSGYlmz4hDYzXcPewgKH+5yGrTQ9/d6fk0b16JjZdIApTr5M5TVHE7/hkvC1H4yz/9ZHjnzGlR69BrNDLw8xmQvAFR/kaVgSw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none Received: from DM6PR05MB4697.namprd05.prod.outlook.com (2603:10b6:5:18::13) by DM6PR05MB5306.namprd05.prod.outlook.com (2603:10b6:5:b::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4608.15; Fri, 15 Oct 2021 00:30:19 +0000 Received: from DM6PR05MB4697.namprd05.prod.outlook.com ([fe80::482:cf8:f4b5:c955]) by DM6PR05MB4697.namprd05.prod.outlook.com ([fe80::482:cf8:f4b5:c955%7]) with mapi id 15.20.4628.009; Fri, 15 Oct 2021 00:30:19 +0000 From: unlvsur unlvsur To: unlvsur unlvsur via Libstdc++ Subject: An interesting "optimization"? for __glibcxx_assert under verbose mode Thread-Topic: An interesting "optimization"? for __glibcxx_assert under verbose mode Thread-Index: AQHXwVtUNHPcRgiejUG7TizDn6OSbw== Date: Fri, 15 Oct 2021 00:30:19 +0000 Message-ID: Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-tmn: [jDqRZGDngDic/XhSLmcry+cBS+WWR7Hbz3QD1VhYOgcFdGBtL6JRnLJ1HOCBPosL] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 0796266b-fb6b-49dc-7b52-08d98f72f78a x-ms-traffictypediagnostic: DM6PR05MB5306: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: Mv+F5Yl8Td5VrKjWN09FScjkXr4p7cRx9adieALDD3AZEgvJC3D+jURtcu0Wsb6M3s3ff9FJw5GbWG6k5RoS4ekfipmGrUT0wANp+bTQfcXI43hoslRwliCwjJ+/NVcl/e4S9/vL2n4A1p1H00J4ueItNSEjbBqGNvwCS9IqzKKR3ar90IzTUMhUR1rl33mKmfe1YzoyxFIhMPKKotlGgw== x-ms-exchange-transport-forked: True MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-3174-8-msonline-outlook-e6bda.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR05MB4697.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 0796266b-fb6b-49dc-7b52-08d98f72f78a X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Oct 2021 00:30:19.0967 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR05MB5306 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, HTML_MESSAGE, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: libstdc++@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libstdc++ mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Oct 2021 00:30:21 -0000 I think the parameter can be just embedded in the symbol name of the functi= on. This improves code gen and make optimizers happier under -Os. But it only works under C++20. This is a proven concept. It works for both gcc and clang https://godbolt.org/z/s35s8MTac https://godbolt.org/z/5KK5PzMEj Os: https://godbolt.org/z/4MjGdTajf https://godbolt.org/z/crfWf41vc Sent from Mail for Window= s