From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 7E507385841B for ; Sat, 10 Jun 2023 18:12:40 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 7E507385841B Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686420759; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IOpXdcYlTUJGFjsrBYg0H0tcy5wn+QBeCVE2UryJG4c=; b=YSOxZu9CAOAxrpS963XHbrEW8z7mCFGhl/PbEb3VTfmgCW8yZw2W1Ewj8MTA2cQVd8de30 6Gs3J8uJNqU6cvPsu3YWRQmeAUk8cGR4FRNlZ5yI+PTZVSer/Fq35KThW6hidWzD+e6SX3 F4v9Eq7zkt7f3386mAAAEaqEmgx9PiA= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-660-0Th-H_HuMoWDWGn7A4_9mA-1; Sat, 10 Jun 2023 14:12:36 -0400 X-MC-Unique: 0Th-H_HuMoWDWGn7A4_9mA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C1EB9811E78; Sat, 10 Jun 2023 18:12:35 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.194.30]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 855CA40CFD45; Sat, 10 Jun 2023 18:12:35 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 35AICWl3184367 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Sat, 10 Jun 2023 20:12:33 +0200 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 35AICWNH184366; Sat, 10 Jun 2023 20:12:32 +0200 Date: Sat, 10 Jun 2023 20:12:26 +0200 From: Jakub Jelinek To: Jakub Juszczakiewicz Cc: gcc@gcc.gnu.org Subject: Re: C/C++ extension for SIMD proposal Message-ID: Reply-To: Jakub Jelinek References: <5885cfba-43e0-660f-4cff-0b0d3dd2adce@juszczakiewicz.net> MIME-Version: 1.0 In-Reply-To: <5885cfba-43e0-660f-4cff-0b0d3dd2adce@juszczakiewicz.net> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,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 Sat, Jun 10, 2023 at 07:51:10PM +0200, Jakub Juszczakiewicz via Gcc wrote: > Hi all, > >     I don't know is here right place for sharing ideas, but I don't have > idea, where I can send it. > I have simple idea. When I turned on OpenMP, for parallelly execute simple > for it's enough when I add line like this before loop: > > #pragma omp parallel for > for (size_t i = 0; i < 1000000; i++) >    vec_c[i] = vec_a[i] * vec_b[i]; > > Why don't use similar idea for show compiler that, it can by done by SIMD > CPU extension? e.g. > > #pragma simd for Use #pragma omp simd for that. That is part of OpenMP for years. Jakub