From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by sourceware.org (Postfix) with ESMTP id 1DAA2385840E for ; Thu, 7 Oct 2021 23:09:17 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 1DAA2385840E Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=kernel.crashing.org Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 197N8FFm027752; Thu, 7 Oct 2021 18:08:15 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 197N8F0O027751; Thu, 7 Oct 2021 18:08:15 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Thu, 7 Oct 2021 18:08:15 -0500 From: Segher Boessenkool To: "Paul A. Clarke" Cc: wschmidt@linux.ibm.com, gcc-patches@gcc.gnu.org Subject: Re: [PATCH v3 1/6] rs6000: Support SSE4.1 "round" intrinsics Message-ID: <20211007230814.GP10333@gate.crashing.org> References: <20210823190310.1679905-1-pc@us.ibm.com> <20210823190310.1679905-2-pc@us.ibm.com> <992ac7bc-85d5-62b9-fadc-5388e372979f@linux.ibm.com> <20210830211643.GB2032444@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210830211643.GB2032444@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com> User-Agent: Mutt/1.4.2.3i X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00, JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Oct 2021 23:09:18 -0000 On Mon, Aug 30, 2021 at 04:16:43PM -0500, Paul A. Clarke wrote: > The confusing thing is that _builtin_mffsl is explicitly supported on earlier > processors, if I read the code right (from gcc/config/rs6000/rs6000.md): Yes. It is very simple to implement everywhere, not significantly slower than mffs. So allowing this builtin to be used everywhere makes it easier to use, with no real downsides. Segher