From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from eggs.gnu.org (eggs.gnu.org [IPv6:2001:470:142:3::10]) by sourceware.org (Postfix) with ESMTPS id 706873858C54 for ; Sat, 30 Dec 2023 12:45:25 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 706873858C54 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=loongson.cn ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 706873858C54 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2001:470:142:3::10 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1703940326; cv=none; b=wY6RpIiYPBSurkzjgz1j9btr4LWj3eZgmd/MmYtalD2NsMG+qvTeCDQhwIujFM6KB9SXEsdz0YhQFsbkUk6EPK9vyaEp/uTE3xd35B8UhC5yPKUaRTFle9kvOZXN1xHuzy6G/3q9CWmLRDmQoZZiwPQgxuDpZc8pBWxwqIHHzbs= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1703940326; c=relaxed/simple; bh=mkbR3jspyff3VuotSHi0/sWNstqARE8Rjl26Lm1LP/8=; h=Subject:To:From:Message-ID:Date:MIME-Version; b=Q1kjXIJNO+L55CdawDR6vZzjIt6RG4JTMLEcRUesCxDWmIORziCcGZhocjLj4i5E8zuPObQUgKfuBd/tlY953a8kymyLYi9SRQ1H32KL38EVxAiFc0hQFNqPC540OFDoXLs/Ljp6JePrFD2Zberzyarr3v81Yl3pOw0kJMQHrS8= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rJYiP-0008WV-Tk for gcc-patches@gcc.gnu.org; Sat, 30 Dec 2023 07:45:24 -0500 Received: from loongson.cn (unknown [117.129.62.51]) by gateway (Coremail) with SMTP id _____8AxDOvWEJBlMKkAAA--.2859S3; Sat, 30 Dec 2023 20:45:11 +0800 (CST) Received: from [192.168.2.109] (unknown [117.129.62.51]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Cx2r3VEJBleJgRAA--.28240S3; Sat, 30 Dec 2023 20:45:10 +0800 (CST) Subject: Re: [PATCH v1] LoongArch: testsuite:Add the "-ffast-math" compilation option for the file vect-fmin-3.c. To: Xi Ruoyao , Richard Sandiford , chenxiaolong Cc: gcc-patches@gcc.gnu.org, i@xen0n.name, xuchenghua@loongson.cn References: <20231229040015.6275-1-chenxiaolong@loongson.cn> <1536d1abc53f3d07dfe7276705cf59b4e571fd17.camel@xry111.site> From: chenglulu Message-ID: <45dd6a99-1069-dd86-22f6-9cddebd2b607@loongson.cn> Date: Sat, 30 Dec 2023 20:45:09 +0800 User-Agent: Mozilla/5.0 (X11; Linux loongarch64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <1536d1abc53f3d07dfe7276705cf59b4e571fd17.camel@xry111.site> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-CM-TRANSID:AQAAf8Cx2r3VEJBleJgRAA--.28240S3 X-CM-SenderInfo: xfkh0wpoxo3qxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBj9xXoWrtFWkKF18uryDXw1UXw1fuFX_yoWfKrb_uw 4kZFsFvw4kCayrJrs0g395tFWkt3yUKry7GFy8ZFWIqw1UX3Z5C3s5KFZYv3W7urW5Jr4D Gwn5A3W3Ary2vosvyTuYvTs0mTUanT9S1TB71UUUUUJqnTZGkaVYY2UrUUUUj1kv1TuYvT s0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUI cSsGvfJTRUUUbf8YFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20x vaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWUJVWUCwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV WUJVW8JwA2z4x0Y4vEx4A2jsIE14v26r4j6F4UM28EF7xvwVC2z280aVCY1x0267AKxVW8 JVW8Jr1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2 x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1Y6r17 McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41lc7 I2V7IY0VAS07AlzVAYIcxG8wCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8 JwCFI7km07C267AKxVWUtVW8ZwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14 v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY 67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2 IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_ Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7IU88Ma5UUUUU== Received-SPF: pass client-ip=114.242.206.163; envelope-from=chenglulu@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9,NICE_REPLY_A=-2.335,SPF_HELO_NONE=0.001,SPF_PASS=-0.001,T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00,BODY_8BITS,KAM_DMARC_STATUS,NICE_REPLY_A,SPF_FAIL,SPF_HELO_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: 在 2023/12/30 下午8:25, Xi Ruoyao 写道: > On Sat, 2023-12-30 at 12:15 +0000, Richard Sandiford wrote: >> This shouldn't be necessary.  The test does: >> >>   for (int i = 0; i < n; i += 2) >>     { >>       x0 = __builtin_fmin (x0, ptr[i + 0]); >>       x1 = __builtin_fmin (x1, ptr[i + 1]); >>     } >>   res[0] = x0; >>   res[1] = x1; >> >> __builtin_fmin is an FP minimum operation that corresponds directly to >> the fmin*3 optab (or reduc_fmin_scal_* for reductions).  It is naturally >> associative, so doesn't need -ffast-math for that. >> >> Does LoongArch provide reduc_min_scal_* but not reduc_fmin_scal_*? >> If so, we probably need a new target selector for fmin/fmax reduction. > Let me try if the [x]vf{min,max} instructions are IEEE-conform. They've > still not released the volume 2 of the instruction manual so I can only > try... > These two instructions are in compliance with the ieee-754 standard.