From nobody Tue Feb 10 14:32:29 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1624631370544658.6893165428644; Fri, 25 Jun 2021 07:29:30 -0700 (PDT) Received: from localhost ([::1]:54642 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lwmpl-0006CY-IF for importer@patchew.org; Fri, 25 Jun 2021 10:29:29 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60790) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lwmfK-0003JJ-7P for qemu-devel@nongnu.org; Fri, 25 Jun 2021 10:18:42 -0400 Received: from mail-ej1-x632.google.com ([2a00:1450:4864:20::632]:43548) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lwmfI-0003Ep-Jc for qemu-devel@nongnu.org; Fri, 25 Jun 2021 10:18:41 -0400 Received: by mail-ej1-x632.google.com with SMTP id nb6so15364314ejc.10 for ; Fri, 25 Jun 2021 07:18:40 -0700 (PDT) Received: from avogadro.lan ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id c28sm326579ejc.102.2021.06.25.07.18.38 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Jun 2021 07:18:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=GNN3PKGCrmEv1egmkbcKJ78YTkUsB3DLKlu9c2s2Q9Y=; b=SDawVslL8U2T3cqpgFD4moIXEhvIRIUP9jUv/u9jwug3+tuhScbxWsS3DU9HGltonz WR8GePGsJbSjJUdyH7Au0Urh9nDP/E3gKzzNl9RR/8Rxj4lUihj3ElejK/XIoJN9fJtC h9fORT/s7TBqCzODkdGue6SXYbJc4T9ObcVh1wMmkawjDgY8XCC2NtA6psMFuwlbGGNG Uor3hJNsgNbzKoB/YFeFGhzovkMYDVehxa55rQ2/UAMmQqr7v3YHdr09ZCFFEvBq+1wO 042ouAD3D0IsqE/fcmVHBIdz6mz49lRHXblZxmyEa/kT1jsxQ4Ws9NjcJcGyrSDdwRHz RgDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=GNN3PKGCrmEv1egmkbcKJ78YTkUsB3DLKlu9c2s2Q9Y=; b=h7+c8dv/kYVIt5N5v+Wk5QsDIvrxnrG0SII4U8vrozsiVh3Ts/0tfe0zoCJFwyXKFG u+zZzhbz9TWz/YxWQlf3NCD9KfyA45R/YLFOnCVcqbniSGXl6DjWg/4iPc7pknj0OOzC Hfg1Eh90rAPO6IfWtDwT7ECzlSV5OKJb6KjIRRtBK1LZnBD4DTKGGUGJO3LjaXgqT7fh uZZKBjrJfPj5ISjADQOEuuOrYkq54UpeLMkI1+rnyWFDOBo617jHToYoPEugUiN4vxay 2Ff3fuQlsO7vH/DrGVH3PGs767duvBWty8JhEtBVE22U3NAEzTXTLsJE53jiS4DR6PJV VPtA== X-Gm-Message-State: AOAM531wuUiaKSYWLHCclBlClENGvYl+weN4L2x3Z7g4H7vbDz6gfwbn uIKcbcfM74AZcnZqTZbKjbDLm5l1b6Q= X-Google-Smtp-Source: ABdhPJwQXDflJpWbtWiTOmgMcbG51cMATsdujMtsQ9fCJYJxaTvSReLAyU9smW/lMgXWgi6kLGMnDA== X-Received: by 2002:a17:906:2bd9:: with SMTP id n25mr11233122ejg.513.1624630719267; Fri, 25 Jun 2021 07:18:39 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 15/28] osdep: provide ROUND_DOWN macro Date: Fri, 25 Jun 2021 16:18:09 +0200 Message-Id: <20210625141822.1368639-16-pbonzini@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210625141822.1368639-1-pbonzini@redhat.com> References: <20210625141822.1368639-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::632; envelope-from=paolo.bonzini@gmail.com; helo=mail-ej1-x632.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" osdep.h provides a ROUND_UP macro to hide bitwise operations for the purpose of rounding a number up to a power of two; add a ROUND_DOWN macro that does the same with truncation towards zero. While at it, change the formatting of some comments. Signed-off-by: Paolo Bonzini Reviewed-by: Max Reitz Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- include/qemu/osdep.h | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h index 0a54bf7be8..c3656b755a 100644 --- a/include/qemu/osdep.h +++ b/include/qemu/osdep.h @@ -319,11 +319,16 @@ extern "C" { }) #endif =20 -/* Round number down to multiple */ +/* + * Round number down to multiple. Safe when m is not a power of 2 (see + * ROUND_DOWN for a faster version when a power of 2 is guaranteed). + */ #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m)) =20 -/* Round number up to multiple. Safe when m is not a power of 2 (see - * ROUND_UP for a faster version when a power of 2 is guaranteed) */ +/* + * Round number up to multiple. Safe when m is not a power of 2 (see + * ROUND_UP for a faster version when a power of 2 is guaranteed). + */ #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m)) =20 /* Check if n is a multiple of m */ @@ -340,11 +345,22 @@ extern "C" { /* Check if pointer p is n-bytes aligned */ #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n)) =20 -/* Round number up to multiple. Requires that d be a power of 2 (see +/* + * Round number down to multiple. Requires that d be a power of 2 (see * QEMU_ALIGN_UP for a safer but slower version on arbitrary - * numbers); works even if d is a smaller type than n. */ + * numbers); works even if d is a smaller type than n. + */ +#ifndef ROUND_DOWN +#define ROUND_DOWN(n, d) ((n) & -(0 ? (n) : (d))) +#endif + +/* + * Round number up to multiple. Requires that d be a power of 2 (see + * QEMU_ALIGN_UP for a safer but slower version on arbitrary + * numbers); works even if d is a smaller type than n. + */ #ifndef ROUND_UP -#define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d))) +#define ROUND_UP(n, d) ROUND_DOWN((n) + (d) - 1, (d)) #endif =20 #ifndef DIV_ROUND_UP --=20 2.31.1