From nobody Sat Nov 23 20:18:12 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=1730231141; cv=none; d=zohomail.com; s=zohoarc; b=Zcyw+b3ujoDl4Qa2fIKa9tigur22hqtTcIkw/eHX+Yc0lGEdmJSsqgy8MXy5u42iTclYlFDJFjzaybDgR0bT8u0tK1lmAIE1dJ9Kw3pSs62hE/8zdAelEN/148K7TADYrz6kGKn5z7SuzdJiq9WIc2c1Qwcrhm5cjwDiV3tVD8s= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1730231141; 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=0rJLm/XAb8yOr4N+S2bheoCtQzw134Ip3Ok40vt1qGY=; b=XIDpKnk05Rw3ybuSE/idj0eMpPcPTZCsuyyuoMjQIkmJ3QLpDGPOjlcPe2dT6p63L5i0T1LaNkgosdCaMYni62kJ7M1hF8HGFpDtkB8fglpF6spjRegcrO19HWhFEKYqfoIR5J3v0DVTsnTWc9KexIybX0EYdbStHwhMbujV/F0= 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 1730231141835185.0718082053928; Tue, 29 Oct 2024 12:45:41 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t5s8I-0002CG-Mz; Tue, 29 Oct 2024 15:44:02 -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 1t5s8F-0002BW-4P for qemu-devel@nongnu.org; Tue, 29 Oct 2024 15:44:00 -0400 Received: from mail-wm1-x331.google.com ([2a00:1450:4864:20::331]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1t5s8C-0006CG-6v for qemu-devel@nongnu.org; Tue, 29 Oct 2024 15:43:58 -0400 Received: by mail-wm1-x331.google.com with SMTP id 5b1f17b1804b1-431616c23b5so1386415e9.0 for ; Tue, 29 Oct 2024 12:43:55 -0700 (PDT) Received: from paolo-laptop-amd.. ([2a0e:cb01:d3:f100:2972:f115:541a:90f8]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43193573551sm154348445e9.6.2024.10.29.12.43.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Oct 2024 12:43:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=embecosm.com; s=google; t=1730231034; x=1730835834; 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=0rJLm/XAb8yOr4N+S2bheoCtQzw134Ip3Ok40vt1qGY=; b=Hu/MPVLo6Bxtyk371VwYtj/kryt7rMQrF1v2TNJxd/1HlnLXmSgRJDBabjt2dXIqfQ 3L3b/FlMAsS7bB8BfDaCmzsXWUJD9TaQ4/f337LgSWuRrHl9JTlEW3v4Ty2eA8MYZLFv Bc0GnA6R5Xtf6GVWW1h8W5G2dojVtTfX9c5RTYVhDw0o0sfMthweaIXNfUQtCd/WWWxM zreY5UA0IaNvRB2qAHVta0trWuZC/dgIOdEj0el5aC7+Z/odM+BNvQCMSmjhEJUuEF6n oJKZAE3DLYCMv7dROeM9LYO6RDTbOF/PSFx7B/0mw3RWwqYOwWVCRWnXSlzcBTNvdj3V Mb6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730231034; x=1730835834; 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=0rJLm/XAb8yOr4N+S2bheoCtQzw134Ip3Ok40vt1qGY=; b=RnqU+LsVSpOfdvJJj5i4314UQayz0E6q9VBOUU9R0KXxWQrvqPi1yMrTzaQ5nNsJHs LjyOV6IuRXGKuzxPXfStKJ2q1Z8oe9Vmd3TUxgl1cnT95XWaKQGAX8AqdPezLmSbtnOA iVzCjuoi2hLqThYGfVjfvFPtBMJLJAXsmkC4b4XoCEKl3Lmxn5srrZCsf+hB0Pb2wvyG BzXFQSHNfeh0j437djDNQWJ7gv5jepkK+fsbHtvS6luKrNgHSWr1hRyWw/N9B4FGrOh0 XJt/j626oMn91ziXUs5LwX5IENnIyxYrzzKEFA+g5rwKcNBUD2sby5BWjsAu0qDNEYf+ 5QxQ== X-Gm-Message-State: AOJu0Yw0pRlac4bs2c54CqmhGGwGQh+WsvLg6cXokA4Mvi5Z53Eo5sN/ Y0/f62wjDLEYWMjW72w8gIsSuCRy0D9LWYM8sAAQBYfH7fGm9tSljLy6md0/A++fKbsl1g7QAgD Gtm7ozg== X-Google-Smtp-Source: AGHT+IHkf1ixYia027E2rMURxHDFVPudOfNIAN/e6Z4LP3E3dQB35wRqfvg1QUaNUrz+vRSGD0SJSQ== X-Received: by 2002:a05:600c:4ec7:b0:42c:b991:98bc with SMTP id 5b1f17b1804b1-431b55a3b11mr29275595e9.0.1730231034472; Tue, 29 Oct 2024 12:43:54 -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 v4 1/2] target/riscv: rvv: reduce the overhead for simple RISC-V vector unit-stride loads and stores Date: Tue, 29 Oct 2024 19:43:47 +0000 Message-ID: <20241029194348.59574-2-paolo.savini@embecosm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241029194348.59574-1-paolo.savini@embecosm.com> References: <20241029194348.59574-1-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::331; envelope-from=paolo.savini@embecosm.com; helo=mail-wm1-x331.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: 1730231143455116600 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Daniel Henrique Barboza --- 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