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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9ABBCC3ABBF for ; Wed, 7 May 2025 12:49:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uCeDP-0005ue-Ke; Wed, 07 May 2025 08:49:35 -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 1uCeDN-0005su-E4 for qemu-devel@nongnu.org; Wed, 07 May 2025 08:49:33 -0400 Received: from mgamail.intel.com ([192.198.163.8]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uCeDL-0005rz-Hi for qemu-devel@nongnu.org; Wed, 07 May 2025 08:49:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1746622171; x=1778158171; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=6lMxAS1FtPrEYPx+4kmzts3bA76jEOE2+dKA/bl3HGA=; b=S5pzXjTeix8k/wYiPgqu9gwbWo0pEdCYjQ5eQk5IqTScUqdb6oTjOzrU s5S7JtxlUiMQ4r4gc26qhjESeDmBB0QB9Nxj/lN3i54jqYt7AKODkUdi0 GpkFeZvvHvtJCQzIv8MIV1iv6+72AJK9Cpry6QIOJHr7CT9Xq4mM5vy0x +Q4tuAKRINyh4bm3Dv53l+sTlflT0kmhQwZfqwVbui3QIbxf3fsL8tysl K689TgfzNLapU1U+ipRUZJPPS5Ef5WL++rNV0uWoOb1fFnYgCDotEgzBJ D47x6l5T1QOFYzJNtaLTp40zFzcUaUBkvRxKphJ+nqNDu6aOzDF2zZxtG Q==; X-CSE-ConnectionGUID: /3uGIFZhTrWBFBO8Om/YKw== X-CSE-MsgGUID: olbW9MZqTmyI7MHlaGdqKg== X-IronPort-AV: E=McAfee;i="6700,10204,11426"; a="65880108" X-IronPort-AV: E=Sophos;i="6.15,269,1739865600"; d="scan'208";a="65880108" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2025 05:49:28 -0700 X-CSE-ConnectionGUID: /Zbw7ssUT16exN9Z9GzdIg== X-CSE-MsgGUID: bK6561E/SoejiiuXyF+4dg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,269,1739865600"; d="scan'208";a="135665265" Received: from liuzhao-optiplex-7080.sh.intel.com (HELO localhost) ([10.239.160.39]) by orviesa009.jf.intel.com with ESMTP; 07 May 2025 05:49:27 -0700 Date: Wed, 7 May 2025 21:10:28 +0800 From: Zhao Liu To: Peter Maydell Cc: qemu-devel@nongnu.org, Richard Henderson , Paolo Bonzini , Eduardo Habkost Subject: Re: [PATCH 1/4] target/i386: Detect flush-to-zero after rounding Message-ID: References: <20250213142613.151308-1-peter.maydell@linaro.org> <20250213142613.151308-2-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250213142613.151308-2-peter.maydell@linaro.org> Received-SPF: pass client-ip=192.198.163.8; envelope-from=zhao1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -57 X-Spam_score: -5.8 X-Spam_bar: ----- X-Spam_report: (-5.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.414, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Feb 13, 2025 at 02:26:10PM +0000, Peter Maydell wrote: > Date: Thu, 13 Feb 2025 14:26:10 +0000 > From: Peter Maydell > Subject: [PATCH 1/4] target/i386: Detect flush-to-zero after rounding > X-Mailer: git-send-email 2.43.0 > > The Intel SDM section 10.2.3.3 on the MXCSR.FTZ bit says that we > flush outputs to zero when we detect underflow, which is after > rounding. Set the detect_ftz flag accordingly. > > This allows us to enable the test in fma.c which checks this > behaviour. > > Signed-off-by: Peter Maydell > Reviewed-by: Richard Henderson > --- > target/i386/tcg/fpu_helper.c | 8 ++++---- > tests/tcg/x86_64/fma.c | 5 ----- > 2 files changed, 4 insertions(+), 9 deletions(-) Reviewed-by: Zhao Liu