From patchwork Wed Oct 2 13:57:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Savini X-Patchwork-Id: 1992021 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=embecosm.com header.i=@embecosm.com header.a=rsa-sha256 header.s=google header.b=Yk+Ho58G; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4XJbx44X88z1xtY for ; Wed, 2 Oct 2024 23:58:00 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1svzr5-0007GG-Qb; Wed, 02 Oct 2024 09:57:27 -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 1svzqv-0007Ep-Uy for qemu-devel@nongnu.org; Wed, 02 Oct 2024 09:57:17 -0400 Received: from mail-lf1-x12b.google.com ([2a00:1450:4864:20::12b]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1svzqt-0003WZ-Jd for qemu-devel@nongnu.org; Wed, 02 Oct 2024 09:57:17 -0400 Received: by mail-lf1-x12b.google.com with SMTP id 2adb3069b0e04-5399041167cso5782111e87.0 for ; Wed, 02 Oct 2024 06:57:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=embecosm.com; s=google; t=1727877432; x=1728482232; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=W2qnYyllQATbKabq15eZV8KBacEwjWblY8OQUHuJ92s=; b=Yk+Ho58GTr9HzpKLb31aWYz3AY3RXj/65hfDkepjQ4laja7gsKfh7ahEE0TVBO39Um Um6hDDKdWdkeyhIgL9egPeALz1Z80RuJH+AJnIhXyXaJWIsRaWYUV2WXxVJX+6kiKB9F TB0mno4RhaaqE6Iv3YfmpfU2vPf9zFFeD1++fAqri5bDJTpYjl2tSFGxj2+hbJWDRcoJ kmSMps1zyfh1UpXhupJa5yvFW9pLmY/H9fSLgdDQVbrjxHef30C3zro8vfhCvl6sYBGz opoFQ6pPekNk5uV/s473WPI+QLhWbwKCaT5yPDK7k4+RDK4lf0G3u7fLV7M2yO99ZqGX c7lQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727877432; x=1728482232; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=W2qnYyllQATbKabq15eZV8KBacEwjWblY8OQUHuJ92s=; b=X3YwLeczxk9CY9ME6YhD4wgfbbEnnm5MmVjis5O1kCwUDDVIc22LBe2hkDCZtXTnk7 0hMKWDWNi8MiA+iXWZOBs1+DznoVDQWI0LKdY6J1xSQXcJqQirtRjIyYJeNaZaqZ/YDE gBIKuj47BWSJf4AGribZ/aHIpiZbvy+sOWHAURAveAGjrZN1J+o/g79CRl03tJoR1RA9 QDxAM3dGl4r53TX4/qexF9j5iqAp1l+ivnWzveIduDVss4oxFio/nM6t9HiVE0l0lnAP sO+QJs/okpLmVqDNw/RSeUANSZzFwpf3R8T+la1bO96Y66Qn67Da2ISPeN3IBnZ7DgpH i4wg== X-Gm-Message-State: AOJu0YycPF9S0kHCcvZ/dFZof34wIav1cUHXBo4c/ztnEpUGKIegpIV8 5ekgM3KdgRzK9h7N57gcBB4o/9d++AGD/lG0YLbJwdSDq6XAc2d+6vUX2j+Hut4W48esxPW53iu CeVk= X-Google-Smtp-Source: AGHT+IGLBequ+PB+kzbbB5UlSsfsWZ6bUSYQUpdeza6js8WJKS38eNl+Vh61jFmqnJrWTaiSq2Xtgw== X-Received: by 2002:a05:6512:b9c:b0:533:4505:5b2a with SMTP id 2adb3069b0e04-539a067ae19mr3027015e87.28.1727877431690; Wed, 02 Oct 2024 06:57:11 -0700 (PDT) Received: from paolo-laptop-amd.sou.embecosm-corp.com ([212.69.42.53]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a93c299ac8esm869975266b.222.2024.10.02.06.57.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Oct 2024 06:57:11 -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 v2 0/2] target/riscv: use a simplified loop to emulate rvv loads/stores only in user mode. Date: Wed, 2 Oct 2024 14:57:06 +0100 Message-ID: <20241002135708.99146-1-paolo.savini@embecosm.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::12b; envelope-from=paolo.savini@embecosm.com; helo=mail-lf1-x12b.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, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The new version of the patch addresses the suggestion given by Richard Handerson here: https://patchew.org/QEMU/20240717153040.11073-1-paolo.savini@embecosm.com/20240717153040.11073-2-paolo.savini@embecosm.com/#aff5f930-d291-4ff5-8f24-53291059d59a@linaro.org about the ineffectiveness of the optimization of the load/store loop for small vector and data sizes when QEMU is in system mode. Changes: - Wrap the optimization of simple RISC-V vector unit-stride loads and stores into a user mode configuration directive. Cc: Richard Handerson Cc: Palmer Dabbelt Cc: Alistair Francis Cc: Bin Meng Cc: Weiwei Li Cc: Daniel Henrique Barboza Cc: Liu Zhiwei Cc: Helene Chelin Cc: Nathan Egge Cc: Max Chou Helene CHELIN (1): target/riscv: rvv: reduce the overhead for simple RISC-V vector unit-stride loads and stores Paolo Savini (1): target/riscv: use a simplified loop to emulate rvv loads/stores only in user mode. target/riscv/vector_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)