From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3EF3AC48BC2 for ; Fri, 25 Jun 2021 06:56:06 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id DC892613F3 for ; Fri, 25 Jun 2021 06:56:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DC892613F3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ilande.co.uk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:49532 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lwfkz-0008W9-0Z for qemu-devel@archiver.kernel.org; Fri, 25 Jun 2021 02:56:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55836) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lwfjO-0005r6-DM for qemu-devel@nongnu.org; Fri, 25 Jun 2021 02:54:26 -0400 Received: from mail.ilande.co.uk ([2001:41c9:1:41f::167]:58724 helo=mail.default.ilande.bv.iomart.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lwfjG-0001s5-VV for qemu-devel@nongnu.org; Fri, 25 Jun 2021 02:54:26 -0400 Received: from host109-153-84-9.range109-153.btcentralplus.com ([109.153.84.9] helo=kentang.home) by mail.default.ilande.bv.iomart.io with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lwfj2-0006FO-OZ; Fri, 25 Jun 2021 07:54:04 +0100 From: Mark Cave-Ayland To: qemu-devel@nongnu.org, hpoussin@reactos.org, aleksandar.rikalo@syrmia.com, f4bug@amsat.org, aurelien@aurel32.net, jiaxun.yang@flygoat.com, jasowang@redhat.com, fthain@telegraphics.com.au, laurent@vivier.eu Date: Fri, 25 Jun 2021 07:53:57 +0100 Message-Id: <20210625065401.30170-7-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210625065401.30170-1-mark.cave-ayland@ilande.co.uk> References: <20210625065401.30170-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 109.153.84.9 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk Subject: [PATCH v2 06/10] qemu/bitops.h: add bitrev8 implementation X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.default.ilande.bv.iomart.io) Received-SPF: pass client-ip=2001:41c9:1:41f::167; envelope-from=mark.cave-ayland@ilande.co.uk; helo=mail.default.ilande.bv.iomart.io X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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: 2.1.23 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" This will be required for an upcoming checksum calculation. Signed-off-by: Mark Cave-Ayland --- include/qemu/bitops.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 03213ce952..110c56e099 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -618,4 +618,26 @@ static inline uint64_t half_unshuffle64(uint64_t x) return x; } +/** + * bitrev8: + * @x: 8-bit value to be reversed + * + * Given an input value with bits:: + * + * ABCDEFGH + * + * return the value with its bits reversed from left to right:: + * + * HGFEDCBA + * + * Returns: the bit-reversed value. + */ +static inline uint8_t bitrev8(uint8_t x) +{ + x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa); + x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc); + x = (x >> 4) | (x << 4) ; + return x; +} + #endif -- 2.20.1