From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by sourceware.org (Postfix) with ESMTPS id E984B3858C50 for ; Sat, 29 Apr 2023 17:52:52 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org E984B3858C50 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pg1-x530.google.com with SMTP id 41be03b00d2f7-517bdd9957dso674875a12.1 for ; Sat, 29 Apr 2023 10:52:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682790772; x=1685382772; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=QxiUoicQ4us6zPO4FmCO46PGfllhg6KUUxzgla7sKww=; b=BBfqPyCEHTdhGEGyA98raSi446UP62nSAbIuCKoKYTMzuMpiCuwtqMdWVncdJe1CAi buowDuxt4ztUq3x41U9M1jcJCyQgQfLymuNHQGqXrIu2FKRiZqCb4yza5FRm5RkLxRW5 GpUV+uJ1Q4L9k+cHMA4FO2IDMlX/K82m7J1bIDFKTZY0qgn2XQ9He3RG51sv1oVMRSsD XXHJWKh2kk+AP/SfwalWm5HGgjua+geJfveZGfx+vQSXfX171Leoki1+R6l9gYdEGIrj HXJLhO5lO3oKFUnXD2OazsjTVfcl/hoVAbSGf6dVt/GqJz/nQnBKUt+WwX6u7YpcJhHZ 0RuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682790772; x=1685382772; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=QxiUoicQ4us6zPO4FmCO46PGfllhg6KUUxzgla7sKww=; b=l5vxLZTjZzevha2BVczO2Pqs3S5dDeGlZJAaTD+SxN6pwecE26ZcJzoZeQmfwDmelW 9vKwLqlbqvYL9PSbdpF3EthuXlAJaWYB6qop3GnLZ07uZUXxY6o65aINv0NEHNvtweI8 tTR1wCyxRoUrnS7t5xVNn314m1qMHniBuCMqnatsEPPM6a9RZ6I/93CLnDSWHZ7xwt2N 6EhubYYsLx5eu+NWbnCmgQ5TUZppTvIu37OwNq8API4oc8naQrqRHXmYRxYXPGkc6r3q OxGkz2J4xW6BWp194T4H4D28CXaUIzUq4PphYhHDFsWxTO+Nj0e272tGy2/JxpxXk675 T0HA== X-Gm-Message-State: AC+VfDwgoZlnk8sNimnNswwTmX9YeNumgNZgSwKNuZVLgcZFxLFCqEDh a0vYS1F6WtIYCEkTdl7hk4k= X-Google-Smtp-Source: ACHHUZ5Xoo5W7plstWyJkYU+P8bisce/5jH6gRIBWCBsarqkqMzL33hTiK5t7Y0GUj9rpI6/fLl9jg== X-Received: by 2002:a17:902:c612:b0:1aa:d866:33c4 with SMTP id r18-20020a170902c61200b001aad86633c4mr1705431plr.53.1682790771816; Sat, 29 Apr 2023 10:52:51 -0700 (PDT) Received: from ?IPV6:2601:681:8600:13d0::99f? ([2601:681:8600:13d0::99f]) by smtp.gmail.com with ESMTPSA id h9-20020a170902f7c900b001a671a396efsm15123012plw.214.2023.04.29.10.52.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 29 Apr 2023 10:52:51 -0700 (PDT) Message-ID: <89831580-fc21-f769-2f50-fffe57e8afe1@gmail.com> Date: Sat, 29 Apr 2023 11:52:50 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [PATCH] RISC-V: Allow RVV VMS{Compare}(V1, V1) simplify to VMSET Content-Language: en-US To: Palmer Dabbelt Cc: gcc-patches@gcc.gnu.org, pan2.li@intel.com, yanzhang.wang@intel.com, juzhe.zhong@rivai.ai, kito.cheng@sifive.com References: From: Jeff Law In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 4/29/23 11:48, Palmer Dabbelt wrote: >> Yea.  And taking advantage of that behavior is definitely a performance >> issue for QEMU.  There's still work to do though.  QEMU on vector code >> is running crazy slow. > > I guess we're kind of off the rails for a GCC patch, but that's > definately true.  Across the board RVV is going to just need a lot of > work, it's very different than SVE or AVX. > > Unfortunately QEMU performance isn't really a priority on our end, but > it's great to see folks digging into it. Well, when a user mode SPEC run goes from ~15 minutes to multiple hours for a single input workload within specint it becomes a development problem. Daniel is loosely affiliated with my group in Ventana, so I can bug him with this kind of stuff. jeff