From patchwork Tue May 7 09:20:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Duan, Zhenzhong" X-Patchwork-Id: 13656452 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8367BC25B75 for ; Tue, 7 May 2024 09:24:09 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1s4H34-0000O5-Ax; Tue, 07 May 2024 05:23:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s4H2l-0000IS-Vr for qemu-devel@nongnu.org; Tue, 07 May 2024 05:23:29 -0400 Received: from mgamail.intel.com ([198.175.65.21]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s4H2k-00008K-AZ for qemu-devel@nongnu.org; Tue, 07 May 2024 05:23:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1715073806; x=1746609806; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=OP3qnqR2eeb5LkENXO26BG3fJHDhCXlpbz0ddpelol0=; b=jr91kzGn2n/qC0s1tFjjVxlKClUxMVUEnR6KnS1WAQG9J7Au2JYQQ+n8 TGMKIXPnqaKTT7+vI3kzdJZWNFDjtmc0O3Ps1Eb5dp5kDYByoeuFFawJ0 ptv6zW+9/Bc9S86Nfp/Dkopr7gDj02i4b8hx8WDFDR0YIyc18E3b0wwQe xaU0eSnsklCDV8Aw6OSWWF63TqFqjKXQKslZYW/NvySu1WymT5IR/J+aY sBOBcorKMMR/DznAzPJFYqtdHYHZDS65tnyyRwX6/K5VscqheF7YeTTdq MZ0CIANY4oOEWIwt1WK3pq1bKm9dbR++oA8X1SNc51DBWsVF05ZEHM18o Q==; X-CSE-ConnectionGUID: Qm554SzNS46sMfycpaiw8w== X-CSE-MsgGUID: yrz/9y78S6iOredMgg8E1w== X-IronPort-AV: E=McAfee;i="6600,9927,11065"; a="10785219" X-IronPort-AV: E=Sophos;i="6.07,260,1708416000"; d="scan'208";a="10785219" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2024 02:23:25 -0700 X-CSE-ConnectionGUID: NLG9r/BsQmm9VtKU9skemQ== X-CSE-MsgGUID: lxb+YFgjRr6N/WqDsBs3VA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,260,1708416000"; d="scan'208";a="28553292" Received: from unknown (HELO SPR-S2600BT.bj.intel.com) ([10.240.192.124]) by fmviesa010-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2024 02:23:22 -0700 From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, eric.auger@redhat.com, mst@redhat.com, peterx@redhat.com, jasowang@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com, kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Zhenzhong Duan Subject: [PATCH v4 06/19] range: Introduce range_get_last_bit() Date: Tue, 7 May 2024 17:20:30 +0800 Message-Id: <20240507092043.1172717-7-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240507092043.1172717-1-zhenzhong.duan@intel.com> References: <20240507092043.1172717-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=198.175.65.21; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -49 X-Spam_score: -5.0 X-Spam_bar: ----- X-Spam_report: (-5.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.581, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This helper get the highest 1 bit position of the upper bound. If the range is empty or upper bound is zero, -1 is returned. Suggested-by: Cédric Le Goater Signed-off-by: Zhenzhong Duan --- include/qemu/range.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/qemu/range.h b/include/qemu/range.h index 205e1da76d..4ce694a398 100644 --- a/include/qemu/range.h +++ b/include/qemu/range.h @@ -20,6 +20,8 @@ #ifndef QEMU_RANGE_H #define QEMU_RANGE_H +#include "qemu/bitops.h" + /* * Operations on 64 bit address ranges. * Notes: @@ -217,6 +219,15 @@ static inline int ranges_overlap(uint64_t first1, uint64_t len1, return !(last2 < first1 || last1 < first2); } +/* Get highest non-zero bit position of a range */ +static inline int range_get_last_bit(Range *range) +{ + if (range_is_empty(range)) { + return -1; + } + return 63 - clz64(range->upb); +} + /* * Return -1 if @a < @b, 1 @a > @b, and 0 if they touch or overlap. * Both @a and @b must not be empty.