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=-5.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 3E232C433DF for ; Mon, 19 Oct 2020 23:05:42 +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 936032240C for ; Mon, 19 Oct 2020 23:05:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="EzJJAQpJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 936032240C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56428 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kUeDk-0006ht-Do for qemu-devel@archiver.kernel.org; Mon, 19 Oct 2020 19:05:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38544) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kUeCc-0005sV-AI for qemu-devel@nongnu.org; Mon, 19 Oct 2020 19:04:30 -0400 Received: from mail-pg1-x543.google.com ([2607:f8b0:4864:20::543]:46322) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kUeCZ-0006JI-Q8 for qemu-devel@nongnu.org; Mon, 19 Oct 2020 19:04:29 -0400 Received: by mail-pg1-x543.google.com with SMTP id q21so868952pgi.13 for ; Mon, 19 Oct 2020 16:04:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=S/RuWL8oYOCUXTso7Nqfx9W2PPmdQxEGf4Ab6PSlrSc=; b=EzJJAQpJI5E02fF+S48b7SLmn5XIcrIpKiF8Kb7eRRA+gvCF2BNCMQ9jMpVH7gF++5 cBy6NLmvOM6rWdKq3mKFMwGAXcQWpKfa+chCbDOnYHbn+KaSQOGOgQlFezOVGILiAb3h mVu8PgAvdaAIgRo6yQuHzFiyK0QR1dQ1FZ2sUV/VZx4FHXJPH+EhIHN7n/Rgx8KLgLG5 AycDuWHsUiH+ESqPIoPu9Eq5QCro2PMlxmsMoNsZKBZOCQS8kquVgbnKjjXdy4mfEBvR KKUlOZM0JXUGgVjND0osn73WhRbUET8EcLgCtgdYpKM+l5u2HtZN1y+4FEPhRO3n++Fd ajUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=S/RuWL8oYOCUXTso7Nqfx9W2PPmdQxEGf4Ab6PSlrSc=; b=EvG65+E9QOIbUjeKHlvtSDBGULPRix/Q/0eUHfGLzuCqQJQ/e4d+M3XiSL3eKkoD+9 fXjVeLzfrqNVIXDyV6rGOdd2cKyPnUhdivsyipXWm+/YW8GMFOX/wIVNervq7U+bD4/o rsv3JGfbuCgad8jWqWoZZgx+JDoycNfIXlBv2EqBvOZc+kdJACj/qYnZ5Ylh2ckSidSM OHWC9HhY8PneboWPGSykj0OAyESFgMGW7ta1VR/WdUkNgr3nkJDkRMUFPEVFlcRdXFSg LcRNapIwNbyK4tJjrowx5AI+zFh8V0vInhFsV53SKXyXi++tkirnrc106fx05UWUxBoJ 5jRw== X-Gm-Message-State: AOAM5314rVjUwOc7Q+5iCqaUxslOboHOxQElnWsJggDOiaPRzu3ti4bm yX9HN2Qf6v4AuASmC7cOMgkkmQ== X-Google-Smtp-Source: ABdhPJx/DzOaPbtIZz+E7BVEGYpH76o2d+IYc5j6F0qnZcA1Y+I4b0FSUs6xe2Mt6Sx8gI7FWwwZXQ== X-Received: by 2002:a63:fd45:: with SMTP id m5mr162113pgj.60.1603148665973; Mon, 19 Oct 2020 16:04:25 -0700 (PDT) Received: from [192.168.1.11] ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id bj17sm39969pjb.15.2020.10.19.16.04.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2020 16:04:25 -0700 (PDT) Subject: Re: [PATCH 0/2] tcg: optimize across branches From: Richard Henderson To: qemu-devel@nongnu.org References: <20201013222330.173525-1-richard.henderson@linaro.org> Message-ID: <895139b7-491c-f181-be40-762b7c2dfb1f@linaro.org> Date: Mon, 19 Oct 2020 16:04:23 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201013222330.173525-1-richard.henderson@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::543; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x543.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: , Cc: peter.maydell@linaro.org, =?UTF-8?Q?Alex_Benn=c3=a9e?= , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Ping. On 10/13/20 3:23 PM, Richard Henderson wrote: > In several cases, it's easy to optimize across a non-taken branch > simply by *not* flushing the relevant tables. This is true both > for value propagation and register allocation. > > This comes up in quite a number of cases with arm, most simply in > how conditional execution is implemented. But it also came up in > discussion of how to implement low-overhead looping for v8.1m. > > > r~ > > > Richard Henderson (2): > tcg: Do not kill globals at conditional branches > tcg/optimize: Flush data at labels not TCG_OPF_BB_END > > include/tcg/tcg-opc.h | 7 +++--- > include/tcg/tcg.h | 4 +++- > tcg/optimize.c | 35 ++++++++++++++------------- > tcg/tcg.c | 55 +++++++++++++++++++++++++++++++++++++++++-- > 4 files changed, 78 insertions(+), 23 deletions(-) >