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 [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 3A6673857360 for ; Thu, 16 Jun 2022 19:49:25 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 3A6673857360 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-212--SaNbQydNjuJlv8yzkTqTA-1; Thu, 16 Jun 2022 15:49:23 -0400 X-MC-Unique: -SaNbQydNjuJlv8yzkTqTA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6C98C185A79C for ; Thu, 16 Jun 2022 19:49:23 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.193.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C69A940CFD0B for ; Thu, 16 Jun 2022 19:49:22 +0000 (UTC) From: Florian Weimer To: gcc-help@gcc.gnu.org Subject: __builtin_clzl code pattern Date: Thu, 16 Jun 2022 21:49:20 +0200 Message-ID: <87fsk4wfr3.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_NONE, 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-help@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-help mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Jun 2022 19:49:26 -0000 Is there a C code pattern that GCC recognizes as the __builtin_clz, similar to what can happen for __builtin_popcountl? Thanks, Florian