From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS3215 2.6.0.0/16 X-Spam-Status: No, score=-4.2 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 2925D1F8C6 for ; Thu, 1 Jul 2021 23:02:42 +0000 (UTC) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 1B26B39724B5 for ; Thu, 1 Jul 2021 23:02:41 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1B26B39724B5 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1625180561; bh=5Vo4xnadNUsDTlFimUmXktZMY5d5o9T57TyLcZ9BqKg=; h=References:In-Reply-To:Date:Subject:To:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=BEeaFI4R1dEX2bUxd/3ZMiztA8dmqyPmQ0VX/zgZWUky7Dcr3FWH8NKnNbN9zGJGg tDM/Xrl2yXqaguX7B3U1/XMbqCWG1pYwDFBjuI6R99vi6xc2gvj9ZB+SRza8eBRqrt vjQq+6o3zDzXqwV6BAZusUUiSEjmSKTScYzsLRF8= Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by sourceware.org (Postfix) with ESMTPS id B9D893851C0D for ; Thu, 1 Jul 2021 23:02:21 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org B9D893851C0D Received: by mail-pf1-x434.google.com with SMTP id s14so7416181pfg.0 for ; Thu, 01 Jul 2021 16:02:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=5Vo4xnadNUsDTlFimUmXktZMY5d5o9T57TyLcZ9BqKg=; b=OJh1VqCXimKMQSAqMUj1pd+v/OgNvSxsKKdPvQzRH3Jf16XqrB10EQD9XE8huEJ44v XuYWD+0SIW2nFvyfzW10pTD/A+isoZ55/3xSRi5vIx2yevFzpO0UmSuI7X1Ks0lO55aJ EWOWlkHCxMW6Qn07EJKfoghU7ca0qx5DApZtQT+C71fvnlg+npDreYHpKXFrR4qyVI+7 j7NBEpq/U01x2Zl12mgXFMWiFteVAyrr50X96Ry4S/F28FL8yp50tYmFoYpG+6+IYS3B g8dcP/uus6wxtQO8i53zNKdI88OFac982nLJIvmHYJKm09pEk9SBw1TIrqOOzGPwl6HJ 3DjQ== X-Gm-Message-State: AOAM5331GKnmw1JPetMK+1zuVBBIe439xys/t40p9qUBuSupzLK0A4UB WZNAUFQTnw375A/tWRqvHX6g5vaMLMDKC26+f6E= X-Google-Smtp-Source: ABdhPJyH1xvnLySB5oB7cR8QH3U4XckXDx1SqxOQ7vKGkU+Gm/VvDXy6M1c4Y9JQtQLHm1hWL7IcB74/AJij3Ag7GxM= X-Received: by 2002:a63:5b02:: with SMTP id p2mr1885546pgb.161.1625180540887; Thu, 01 Jul 2021 16:02:20 -0700 (PDT) MIME-Version: 1.0 References: <20210701210537.51272-1-hjl.tools@gmail.com> In-Reply-To: Date: Thu, 1 Jul 2021 16:01:45 -0700 Message-ID: Subject: Re: [PATCH] Add optional _Float16 support To: Joseph Myers Content-Type: text/plain; charset="UTF-8" X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "H.J. Lu via Libc-alpha" Reply-To: "H.J. Lu" Cc: llvm-dev@lists.llvm.org, GCC Patches , GNU C Library , IA32 System V Application Binary Interface Errors-To: libc-alpha-bounces+e=80x24.org@sourceware.org Sender: "Libc-alpha" On Thu, Jul 1, 2021 at 3:40 PM Joseph Myers wrote: > > On Thu, 1 Jul 2021, H.J. Lu wrote: > > > BTW, _Float16 software emulation may require more than just SSE > > since we need to do _Float16 load and store with XMM registers. > > There is no 16bit load/store for XMM registers without AVX512FP16. > > You should be able to make the move go via general-purpose registers (for > example) if you can't do a direct 16-bit load/store for XMM registers. > There is no 16bit move between GPRs and XMM registers without AVX512FP16. -- H.J.