From patchwork Wed Sep 25 15:13:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Savini X-Patchwork-Id: 13812208 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 40099FC619B for ; Wed, 25 Sep 2024 15:14:21 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1stTiL-0007Ay-1c; Wed, 25 Sep 2024 11:14:01 -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 1stTiJ-00077q-0d for qemu-devel@nongnu.org; Wed, 25 Sep 2024 11:13:59 -0400 Received: from mail-ej1-x62f.google.com ([2a00:1450:4864:20::62f]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1stTiH-0000zF-GT for qemu-devel@nongnu.org; Wed, 25 Sep 2024 11:13:58 -0400 Received: by mail-ej1-x62f.google.com with SMTP id a640c23a62f3a-a93a1cda54dso139402566b.2 for ; Wed, 25 Sep 2024 08:13:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=embecosm.com; s=google; t=1727277236; x=1727882036; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=GKy/CyRSVUaBnXxnNttl6Oo4OhYAsB0CU8IGh0o82+4=; b=F39FhoWIOMGB8gyO3Q07LybEG4UXHhBemZ9hBj9NLpBoHlGIC6ZCwd/6WWYM6DJPtV QkcC3kWEwgvNJiyFvEJH8ln8+Am+CVEZPZ2GRFYgbv1BXOFrGPsDyHrC9HVVRemr0yRw RTS/aAjtLQ3du8LFnLPPfOrwfvNqa3uPg3zpsmu3B1X8vez1mJeXCQ9TSxXJCFz/Ap9S EICr0FzFrr9eebZESIttGPI98r5L1C5zY+nE0UU9BHseOYgZxMD3UUKYvkrlP+RGZLZq vBPu8WrI2NCHGLgTB1bJ/i75QTdpa+UpyOb34qWp2jxNaZqlf7TOE3s4RzJj/tKrAOtK yHkA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727277236; x=1727882036; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=GKy/CyRSVUaBnXxnNttl6Oo4OhYAsB0CU8IGh0o82+4=; b=moXKja0mq1+1exxC1DrY5GYaug6Rpx81YAcRlaUoqchs7zRQJAGTRXbmkqjgU7Scj8 r3RN45dxteYZWGJCJujt1LZF9Ega7IFubMjM8F2ZOfAPycL9NltAMgmuVxGn95fGabl6 3+rqQCeL7wNe3ttQp/XBDGwdzcPX72sTLf9by0Cu8nA3PGMNP1FsnzcxsQ6FqaQ5+/WU yE+KlR0TStCPUsP5Pf+0LXP2NWgsTa1kbrRr2uo3aDcCdrBHIf0XeVr3IQDtI8KCvtDH kZHi+lJwnYYvWMy0xQfTpLcm8AsSEzfL4S4rEpWh2etkFOw7hFoTe+Cs1LFsiC9qbdg5 QaBw== X-Gm-Message-State: AOJu0YyNQ97cSkJ4Dl2q910IMkoTJyhCv+/XRp31eWmsPBxq8/HR57Ky ibBzBRBBgwFFsFkGE/4aGzyECrPkGs4i8VF1omxFhGCit5WHZndh7s9HhtZRklj8lzu2NYqd0zm QRLU= X-Google-Smtp-Source: AGHT+IFX8vn/C3P/lrh4VPZgXIMuYD9h7SXvjQbxfcVgmrwNly3VMwsOtUlOfYUPXWD2u3I09DJo5w== X-Received: by 2002:a17:907:970e:b0:a8d:6073:2c13 with SMTP id a640c23a62f3a-a93a03b6d6cmr299279466b.33.1727277235574; Wed, 25 Sep 2024 08:13:55 -0700 (PDT) Received: from paolo-laptop-amd.sou.embecosm-corp.com ([212.69.42.53]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9393138af7sm217158566b.206.2024.09.25.08.13.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Sep 2024 08:13:55 -0700 (PDT) From: Paolo Savini To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: Paolo Savini , Richard Handerson , Palmer Dabbelt , Alistair Francis , Bin Meng , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Helene Chelin , Nathan Egge , Max Chou Subject: [RFC 1/1] target/riscv: use a simplified loop to emulate rvv loads/stores only in user mode. Date: Wed, 25 Sep 2024 16:13:30 +0100 Message-ID: <20240925151330.50215-2-paolo.savini@embecosm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240925151330.50215-1-paolo.savini@embecosm.com> References: <20240925151330.50215-1-paolo.savini@embecosm.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::62f; envelope-from=paolo.savini@embecosm.com; helo=mail-ej1-x62f.google.com 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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 The simplified emulation of vector loads and stores that bypasses the memory probing in the vext_ldst_us helper function seem to benefit only the user mode. We therefore limit this approach to the user mode configuration. Signed-off-by: Paolo Savini --- target/riscv/vector_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c index 9026661573..08f71abc22 100644 --- a/target/riscv/vector_helper.c +++ b/target/riscv/vector_helper.c @@ -648,6 +648,7 @@ vext_ldst_us(void *vd, target_ulong base, CPURISCVState *env, uint32_t desc, VSTART_CHECK_EARLY_EXIT(env); +#ifdef CONFIG_USER_ONLY /* For data sizes <= 64 bits and for LMUL=1 with VLEN=128 bits we get a * better performance by doing a simple simulation of the load/store * without the overhead of prodding the host RAM */ @@ -692,7 +693,7 @@ vext_ldst_us(void *vd, target_ulong base, CPURISCVState *env, uint32_t desc, vext_set_tail_elems_1s(evl, vd, desc, nf, esz, max_elems); return; } - +#endif vext_cont_ldst_elements(&info, base, env->vreg, env->vstart, evl, desc, log2_esz, false);