From nobody Tue Oct 22 23:26:46 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1728943390; cv=none; d=zohomail.com; s=zohoarc; b=K30V+gvZTAvJTXdUH2N809FCrvYH/qrBJm4FcqxncFfeiwQ2dSXPA0Lh3GMzfYDPgI4UhCdg0qH/bOk2VhWyU5z5a85sKJDSiXHNOayZlj+pCcRehmocfACu8mxTshUNH2q4OfqebhqBYiepSBLljGm6N1Fjwb8yb+qtgnfR9I0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1728943390; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=0JdDoRc6lQKD0tC2G2LkGtaHLsrOMaDAUB7oKyb4cqs=; b=cr/ZOSZ/P36X36RKkuF4M/6CFYYnXRk1UFjpZCAIn5AiehG3OfU1rNTU9obxmOLyaO+pPtTa2LCBqmc7EvKVghiCKoXXxsXLn/O4QWcLdPwuVLG//JKDrCV1LlfsYdnS71inX0SWH7H93qazF181YfJNJNYu/yGJWF4xJw5Z3KA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1728943390077552.0998532318957; Mon, 14 Oct 2024 15:03:10 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t0T8j-0003jQ-Du; Mon, 14 Oct 2024 18:02:09 -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 1t0T8i-0003iU-5f for qemu-devel@nongnu.org; Mon, 14 Oct 2024 18:02:08 -0400 Received: from mail-wr1-x42a.google.com ([2a00:1450:4864:20::42a]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1t0T8d-0006UP-NR for qemu-devel@nongnu.org; Mon, 14 Oct 2024 18:02:06 -0400 Received: by mail-wr1-x42a.google.com with SMTP id ffacd0b85a97d-37d4c1b1455so3522552f8f.3 for ; Mon, 14 Oct 2024 15:02:00 -0700 (PDT) Received: from paolo-laptop-amd.. ([2a0e:cb01:d3:f100:8971:afed:16dc:a06f]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d7fa7a09dsm22769f8f.23.2024.10.14.15.01.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Oct 2024 15:01:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=embecosm.com; s=google; t=1728943319; x=1729548119; 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=0JdDoRc6lQKD0tC2G2LkGtaHLsrOMaDAUB7oKyb4cqs=; b=eZXOYL5471YL3YwUoBTRrkITet266peYDLRMI33MEl//FANF4tI5GP5PnQYSIpTXJZ 8pIEvSKYLzf/Pgx822B6kqgxjMfMRaNvqJjvaibR+ZUApCfM2kfMCS5h9uaavgGF2n0L WssMWqCn5relt5xddzh7J/tztCh/g+JQ4pjkZ/Bj58f0mgWO9ycE9GYLECwA1O+b8u+P CIK6igkc9ni2Nm+dwOVhTcCqG+4bC4hv9CQn/2OFezPkn6HexCzhB8A92B1u8pbqirlC h+hc1dWyj3tflB1A2NOt/c4aX+yYOvVMhUYm8tr8B2Z8aRFf+qyIvcJ8zRMIDr6d+0Xu GXuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728943319; x=1729548119; 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=0JdDoRc6lQKD0tC2G2LkGtaHLsrOMaDAUB7oKyb4cqs=; b=SOIEy05RDpKTmcecYG4RKfTlm4Ws/SpXequE7EG/GH615x5HAveP2RP625vOEfU7MU gFY8zhtji3PeGwaZs1FXIkbxcMK9hHIn5EKbQyeuC9I7l9CtpS81uwoL+1BO8upupqCe hjgemkfeX1fzbfPDAOxCxP/9CLs4RGNqGGyEyhtNZ8jbnsu3uBqEnkXE6xz4Hs8xvS8B 3SGJGWFfT7J0OwffqrDhaTyx1I0nHYlE61FZ/rot4dOEFbJmnByaOt52QltfgNcmhG8P O5xYJm1w4CZgQSCp9OcEdjs334yOEzBBIz9zybXEmivmmz4RulRItm4fdY7URMVgNq5S DnYw== X-Gm-Message-State: AOJu0Yx4kfVzLXWZ2HBDzjp6dqqmGNzxk6L+aLaKfO5V+HJWazXsj7BA bGWoObv7fmSIAqR2UFXpkKBzNE06DzBrKHUkJ8jrsje9GE08KvSCXD/rKLAfXXk9JiMyw/4XVkX 5CVE= X-Google-Smtp-Source: AGHT+IHKvqkygu2mhti3SKjm2nAri/XQh526pSaaHfjmbjO8WNj5rySGeWAbbQxJ/80FKD9lN+DMXg== X-Received: by 2002:a5d:4fc8:0:b0:378:89be:1825 with SMTP id ffacd0b85a97d-37d5529bc9fmr9030781f8f.49.1728943318859; Mon, 14 Oct 2024 15:01:58 -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 v3 1/2] target/riscv: rvv: reduce the overhead for simple RISC-V vector unit-stride loads and stores Date: Mon, 14 Oct 2024 23:01:52 +0100 Message-ID: <20241014220153.196183-2-paolo.savini@embecosm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241014220153.196183-1-paolo.savini@embecosm.com> References: <20241014220153.196183-1-paolo.savini@embecosm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42a; envelope-from=paolo.savini@embecosm.com; helo=mail-wr1-x42a.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=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @embecosm.com) X-ZM-MESSAGEID: 1728943391298116600 Content-Type: text/plain; charset="utf-8" From: Helene CHELIN This patch improves the performance of the emulation of the RVV unit-stride loads and stores in the following cases: - when the data being loaded/stored per iteration amounts to 8 bytes or les= s. - when the vector length is 16 bytes (VLEN=3D128) and there's no grouping o= f the vector registers (LMUL=3D1). The optimization consists of avoiding the overhead of probing the RAM of the host machine and doing a loop load/store on the input data grouped in chunks of as many bytes as possible (8,4,2,1 bytes). Co-authored-by: Helene CHELIN Co-authored-by: Paolo Savini Signed-off-by: Helene CHELIN --- target/riscv/vector_helper.c | 47 ++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c index 4479726acf..75c24653f0 100644 --- a/target/riscv/vector_helper.c +++ b/target/riscv/vector_helper.c @@ -635,6 +635,53 @@ vext_ldst_us(void *vd, target_ulong base, CPURISCVStat= e *env, uint32_t desc, =20 VSTART_CHECK_EARLY_EXIT(env); =20 +#if defined(CONFIG_USER_ONLY) && !HOST_BIG_ENDIAN + /* For data sizes <=3D 64 bits and for LMUL=3D1 with VLEN=3D128 bits w= e get a + * better performance by doing a simple simulation of the load/store + * without the overhead of prodding the host RAM */ + if ((nf =3D=3D 1) && ((evl << log2_esz) <=3D 8 || + ((vext_lmul(desc) =3D=3D 0) && (simd_maxsz(desc) =3D=3D 16)))) { + + uint32_t evl_b =3D evl << log2_esz; + + for (uint32_t j =3D env->vstart; j < evl_b;) { + addr =3D base + j; + if ((evl_b - j) >=3D 8) { + if (is_load) + lde_d_tlb(env, adjust_addr(env, addr), j, vd, ra); + else + ste_d_tlb(env, adjust_addr(env, addr), j, vd, ra); + j +=3D 8; + } + else if ((evl_b - j) >=3D 4) { + if (is_load) + lde_w_tlb(env, adjust_addr(env, addr), j, vd, ra); + else + ste_w_tlb(env, adjust_addr(env, addr), j, vd, ra); + j +=3D 4; + } + else if ((evl_b - j) >=3D 2) { + if (is_load) + lde_h_tlb(env, adjust_addr(env, addr), j, vd, ra); + else + ste_h_tlb(env, adjust_addr(env, addr), j, vd, ra); + j +=3D 2; + } + else { + if (is_load) + lde_b_tlb(env, adjust_addr(env, addr), j, vd, ra); + else + ste_b_tlb(env, adjust_addr(env, addr), j, vd, ra); + j +=3D 1; + } + } + + env->vstart =3D 0; + 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); /* Probe the page(s). Exit with exception for any invalid page. */ --=20 2.34.1 From nobody Tue Oct 22 23:26:46 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1728943390; cv=none; d=zohomail.com; s=zohoarc; b=OhJ+axDRR8rjGf8+0+xuGpuOpRzXIdCWukmwpoO5QvhuE4lmzI6A60PTsyeUaW/ZaPOG8vxZkR/7vpm4RTlB/+ZlPyJTJ37XVjHjiHOyiDI1XNxStM7QEPTS8iBfDzDmZPfCh2NMq6MQt19pUpGj10saFgZbh7eSZLFpUK5VF1U= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1728943390; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=mser6RZhK+UJgovuFS53xmD+fZjgdUZFZOhfivY7xVc=; b=ThreqPGvsdKQ5O5trILiJN2tTTPESxBPB1/kcEaELWgiGrrLxARg1rPUsYXzCOUYiRx1pUhOrHDjKAz5y/6YJno/hnlLIiQk2O63Gh55CYq/eI3gwuCFEEKOgT+MrFGZmYGiCXAQ6hlxcnqBaSFXKvOfW5JafqcZvD/LeojhF3M= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1728943390079689.7619320785943; Mon, 14 Oct 2024 15:03:10 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t0T8k-0003jr-9R; Mon, 14 Oct 2024 18:02:10 -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 1t0T8i-0003iV-5r for qemu-devel@nongnu.org; Mon, 14 Oct 2024 18:02:08 -0400 Received: from mail-wm1-x32e.google.com ([2a00:1450:4864:20::32e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1t0T8e-0006Ug-BK for qemu-devel@nongnu.org; Mon, 14 Oct 2024 18:02:06 -0400 Received: by mail-wm1-x32e.google.com with SMTP id 5b1f17b1804b1-43117ed8adbso52637755e9.2 for ; Mon, 14 Oct 2024 15:02:02 -0700 (PDT) Received: from paolo-laptop-amd.. 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Date: Mon, 14 Oct 2024 23:01:53 +0100 Message-ID: <20241014220153.196183-3-paolo.savini@embecosm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241014220153.196183-1-paolo.savini@embecosm.com> References: <20241014220153.196183-1-paolo.savini@embecosm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::32e; envelope-from=paolo.savini@embecosm.com; helo=mail-wm1-x32e.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=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @embecosm.com) X-ZM-MESSAGEID: 1728943391253116600 Content-Type: text/plain; charset="utf-8" This patch optimizes the emulation of unit-stride load/store RVV instructio= ns when the data being loaded/stored per iteration amounts to 64 bytes or more. The optimization consists of calling __builtin_memcpy on chunks of data of = 128 bytes between the memory address of the simulated vector register and the destination memory address and vice versa. This is done only if we have direct access to the RAM of the host machine, if the host is little endiand and if it supports atomic 128 bit memory operations. Signed-off-by: Paolo Savini --- target/riscv/vector_helper.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c index 75c24653f0..b3d0be8e39 100644 --- a/target/riscv/vector_helper.c +++ b/target/riscv/vector_helper.c @@ -488,7 +488,19 @@ vext_group_ldst_host(CPURISCVState *env, void *vd, uin= t32_t byte_end, } =20 fn =3D fns[is_load][group_size]; - fn(vd, byte_offset, host + byte_offset); + + /* x86 and AMD processors provide strong guarantees of atomicity for + * 16-byte memory operations if the memory operands are 16-byte aligne= d */ + if (!HOST_BIG_ENDIAN && (byte_offset + 16 < byte_end) && ((byte_offset= % 16) =3D=3D 0) && + ((cpuinfo & (CPUINFO_ATOMIC_VMOVDQA | CPUINFO_ATOMIC_VMOVDQU)) != =3D 0)) { + group_size =3D MO_128; + if (is_load) + __builtin_memcpy((uint8_t *)(vd + byte_offset), (uint8_t *)(host += byte_offset), 16); + else + __builtin_memcpy((uint8_t *)(host + byte_offset), (uint8_t *)(vd += byte_offset), 16); + } else { + fn(vd, byte_offset, host + byte_offset); + } =20 return 1 << group_size; } --=20 2.34.1