From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1326EC433E0 for ; Wed, 5 Aug 2020 16:50:34 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id D3F6722CF7 for ; Wed, 5 Aug 2020 16:50:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="Sv/nT8Ut" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D3F6722CF7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:48738 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k3Mcb-0008Ou-5D for qemu-devel@archiver.kernel.org; Wed, 05 Aug 2020 12:50:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57522) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k3Mb8-000739-Ri for qemu-devel@nongnu.org; Wed, 05 Aug 2020 12:49:02 -0400 Received: from mail-pj1-x1029.google.com ([2607:f8b0:4864:20::1029]:40522) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1k3Mb7-0004MQ-0t for qemu-devel@nongnu.org; Wed, 05 Aug 2020 12:49:02 -0400 Received: by mail-pj1-x1029.google.com with SMTP id d4so4589088pjx.5 for ; Wed, 05 Aug 2020 09:49:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=2jkOLs2Fczrz+WeSwz9LcNBM209XPoRACV7oi+7U/TU=; b=Sv/nT8UtC1YzA1aHmoS35NwUydAHOa9cqhv9e32WO1wH3BBk9/zuGKExOfcc0tPGyv GhoT6I/xyle1TM74gqr69wkVIDLVcWPXcGdo6uRkYnVYxto++8mRS2TUIpqrzYRwdPYa AkWtXoc+nVIqpSh2smcAYnK3KBu+Oxd/ZZDVrTlX6Vq8snJIo6viBvXGF0kn7pC2R4Yu /WC7VcCcAuzNkwBPp+bS4XAvcqdMW9A9GgrF4Z54YMLhZsht7bOUQfIJGJb+jhl/0Kvc htDnJ51gSnmXk5ri1qUd89Up1Gg/sifr4iQwugZJosxkkAQXUnpZVIvtpTAWPH+/ybCl rRUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=2jkOLs2Fczrz+WeSwz9LcNBM209XPoRACV7oi+7U/TU=; b=CfYaB5Cp6hswz/Gygd0yd2SmzJzBAi/BcbeictjClJSvuYlJnNjCVGaTnu0yZtnlws 7vbtFhchUKimhKP/utI9btwMKd7R8+BBw1ULPWHE1x7EVKPQY9VGmXXnzz2mwoN3h/0W HpUAXLrb2nIHh19y8IpFJe9zJ5GRGzf2CZx5XrAmzdlvxYyiYeB5n7p8CKbikX1FgWbt vD3vsXOvIolLLmQ/HqhJmI2u3ZBC3vo3XEljF4MW8vwWxKnhR/uih9DK5Lwpc140qoKn u5zaC3ACJJ6p0RrBYLyN3rqqLD8QSAZRUbq7p4ncNP6QQoupIhqJasxYQJZRUPH7dJID jHqg== X-Gm-Message-State: AOAM533xpwuNOEMn4UFbVQpdMWjhchINNhcpiL5t2LLE1O4l84e522PR Ko6kcpT7KgO0s02rfaursCEAPQ== X-Google-Smtp-Source: ABdhPJwtnjFlbSNWyTmA2pscs9aUd5J286fWFCMlgTRyFurNZt6JibGWZXv5IyfyKfK1Vm6Wo65Xrw== X-Received: by 2002:a17:90b:94c:: with SMTP id dw12mr4175111pjb.214.1596646139414; Wed, 05 Aug 2020 09:48:59 -0700 (PDT) Received: from [192.168.1.11] ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id q73sm3845350pjc.11.2020.08.05.09.48.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Aug 2020 09:48:58 -0700 (PDT) Subject: Re: [RFC v2 50/76] target/riscv: rvv-0.9: single-width saturating add and subtract instructions To: Frank Chang References: <20200722091641.8834-1-frank.chang@sifive.com> <20200722091641.8834-51-frank.chang@sifive.com> From: Richard Henderson Message-ID: Date: Wed, 5 Aug 2020 09:48:56 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1029; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1029.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "open list:RISC-V" , Sagar Karandikar , Bastian Koppelmann , "qemu-devel@nongnu.org Developers" , Palmer Dabbelt , Alistair Francis , LIU Zhiwei Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/3/20 7:40 PM, Frank Chang wrote: > This isn't what spike does. > > The manual could really stand to be more specific here... > > Isn't Spike's vsaddu.vi immediate value also signed-extended?  > /riscv/insns/vsaddu_vi.h:/ > /vd = vs2 + (insn.v_simm5() & (UINT64_MAX >> (64 - P.VU.vsew))); / Whoops, quite right. Masking to SEW, not (u)imm5. r~