From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 122690 invoked by alias); 15 Sep 2016 12:51:22 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 122679 invoked by uid 89); 15 Sep 2016 12:51:21 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_PASS,URIBL_RED autolearn=ham version=3.3.2 spammy= X-HELO: relay1.mentorg.com Received: from relay1.mentorg.com (HELO relay1.mentorg.com) (192.94.38.131) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Thu, 15 Sep 2016 12:51:11 +0000 Received: from nat-ies.mentorg.com ([192.94.31.2] helo=svr-ies-mbx-01.mgc.mentorg.com) by relay1.mentorg.com with esmtp id 1bkW8D-0005JM-56 from joseph_myers@mentor.com ; Thu, 15 Sep 2016 05:51:09 -0700 Received: from digraph.polyomino.org.uk (137.202.0.87) by svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Thu, 15 Sep 2016 13:51:06 +0100 Received: from jsm28 (helo=localhost) by digraph.polyomino.org.uk with local-esmtp (Exim 4.86_2) (envelope-from ) id 1bkW85-0007qd-Pp; Thu, 15 Sep 2016 12:51:01 +0000 Date: Thu, 15 Sep 2016 13:05:00 -0000 From: Joseph Myers To: Tamar Christina CC: GCC Patches , "jakub@redhat.com" , "rguenther@suse.de" , "law@redhat.com" , nd , Wilco Dijkstra Subject: Re: [PATCH] Optimise the fpclassify builtin to perform integer operations when possible In-Reply-To: <470b48c8-5ed9-cc23-f6f5-a87fc9e0bc52@arm.com> Message-ID: References: <9a9cc4d4-f4ff-6507-9a09-a0d99525720e@arm.com> <470b48c8-5ed9-cc23-f6f5-a87fc9e0bc52@arm.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" X-ClientProxiedBy: svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) To svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) X-SW-Source: 2016-09/txt/msg00939.txt.bz2 On Thu, 15 Sep 2016, Tamar Christina wrote: > a rather large costs in complexity. Also wouldn't this be problematic > for other functions as well such as expand_builtin_signbit? expand_builtin_signbit computes a word number and the bit position in that word. It has no problem with 128-bit types on 32-bit systems where the largest integer mode supported for scalar variables is DImode. -- Joseph S. Myers joseph@codesourcery.com