From nobody Tue Nov 4 16:01:28 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1504082090768496.89217126139147; Wed, 30 Aug 2017 01:34:50 -0700 (PDT) Received: from localhost ([::1]:49011 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmySW-0007xY-Pu for importer@patchew.org; Wed, 30 Aug 2017 04:34:48 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33891) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmyQb-0006ju-Dv for qemu-devel@nongnu.org; Wed, 30 Aug 2017 04:32:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dmyQa-000388-JH for qemu-devel@nongnu.org; Wed, 30 Aug 2017 04:32:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37114) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dmyQa-00037p-Cu for qemu-devel@nongnu.org; Wed, 30 Aug 2017 04:32:48 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 627BB80099; Wed, 30 Aug 2017 08:32:47 +0000 (UTC) Received: from pxdev.xzpeter.org.com (dhcp-14-103.nay.redhat.com [10.66.14.103]) by smtp.corp.redhat.com (Postfix) with ESMTP id 68CD084792; Wed, 30 Aug 2017 08:32:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 627BB80099 Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=peterx@redhat.com From: Peter Xu To: qemu-devel@nongnu.org Date: Wed, 30 Aug 2017 16:31:59 +0800 Message-Id: <1504081950-2528-3-git-send-email-peterx@redhat.com> In-Reply-To: <1504081950-2528-1-git-send-email-peterx@redhat.com> References: <1504081950-2528-1-git-send-email-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 30 Aug 2017 08:32:47 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC v2 02/33] bitmap: introduce bitmap_count_one() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Andrea Arcangeli , Juan Quintela , Alexey Perevalov , peterx@redhat.com, "Dr . David Alan Gilbert" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Count how many bits set in the bitmap. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu Reviewed-by: Juan Quintela --- include/qemu/bitmap.h | 10 ++++++++++ util/bitmap.c | 15 +++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index c318da1..a13bd28 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -82,6 +82,7 @@ int slow_bitmap_andnot(unsigned long *dst, const unsigned= long *bitmap1, const unsigned long *bitmap2, long bits); int slow_bitmap_intersects(const unsigned long *bitmap1, const unsigned long *bitmap2, long bits); +long slow_bitmap_count_one(const unsigned long *bitmap, long nbits); =20 static inline unsigned long *bitmap_try_new(long nbits) { @@ -216,6 +217,15 @@ static inline int bitmap_intersects(const unsigned lon= g *src1, } } =20 +static inline long bitmap_count_one(const unsigned long *bitmap, long nbit= s) +{ + if (small_nbits(nbits)) { + return (ctpopl(*bitmap & BITMAP_LAST_WORD_MASK(nbits))); + } else { + return slow_bitmap_count_one(bitmap, nbits); + } +} + void bitmap_set(unsigned long *map, long i, long len); void bitmap_set_atomic(unsigned long *map, long i, long len); void bitmap_clear(unsigned long *map, long start, long nr); diff --git a/util/bitmap.c b/util/bitmap.c index efced9a..3446d72 100644 --- a/util/bitmap.c +++ b/util/bitmap.c @@ -355,3 +355,18 @@ int slow_bitmap_intersects(const unsigned long *bitmap= 1, } return 0; } + +long slow_bitmap_count_one(const unsigned long *bitmap, long nbits) +{ + long k, lim =3D nbits/BITS_PER_LONG, result =3D 0; + + for (k =3D 0; k < lim; k++) { + result +=3D ctpopl(bitmap[k]); + } + + if (nbits % BITS_PER_LONG) { + result +=3D ctpopl(bitmap[k] & BITMAP_LAST_WORD_MASK(nbits)); + } + + return result; +} --=20 2.7.4