From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 41532 invoked by alias); 8 Jun 2018 10:59:24 -0000 Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-owner@gcc.gnu.org Received: (qmail 41511 invoked by uid 89); 8 Jun 2018 10:59:22 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.6 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RCVD_IN_DNSWL_LOW autolearn=no version=3.3.2 spammy=sk:schwab@, ssh, schwab@linux-m68k.org, schwablinuxm68korg X-HELO: mail-out.m-online.net Received: from mail-out.m-online.net (HELO mail-out.m-online.net) (212.18.0.10) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 08 Jun 2018 10:59:20 +0000 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 412KD60VDMz1qtFb; Fri, 8 Jun 2018 12:59:18 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 412KD60Hchz1qqkG; Fri, 8 Jun 2018 12:59:18 +0200 (CEST) Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id ZACHxn5ZV6-Q; Fri, 8 Jun 2018 12:59:17 +0200 (CEST) X-Auth-Info: NcUNFCkzicNURFw6v8S73qMSG3aTr2a2340kgsZkDA7eFNfG7KXnnekDRcC9sZKs Received: from igel.home (ppp-188-174-148-234.dynamic.mnet-online.de [188.174.148.234]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Fri, 8 Jun 2018 12:59:17 +0200 (CEST) Received: by igel.home (Postfix, from userid 1000) id AEBA52C4CF0; Fri, 8 Jun 2018 12:59:16 +0200 (CEST) From: Andreas Schwab To: Paul Koning Cc: GCC Development Subject: Re: decrement_and_branch_until_zero pattern References: <40F210CF-1193-48F5-AA77-1AB93E6CA642@comcast.net> X-Yow: Didn't I buy a 1951 Packard from you last March in Cairo? Date: Fri, 08 Jun 2018 11:00:00 -0000 In-Reply-To: <40F210CF-1193-48F5-AA77-1AB93E6CA642@comcast.net> (Paul Koning's message of "Thu, 7 Jun 2018 20:47:52 -0400") Message-ID: <87d0x14k8r.fsf@igel.home> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-SW-Source: 2018-06/txt/msg00103.txt.bz2 On Jun 07 2018, Paul Koning wrote: > None of these seem to use that loop optimization, with -O2 or -Os. Did I > miss some magic switch to turn on something else that isn't on by default? > Or is this a feature that was broken long ago and not noticed? If so, any > hints where I might look for a reason? commit 7d3c6452d7 Author: rakdver Date: Thu Mar 2 23:50:55 2006 +0000 * loop.c: Removed. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@111650 138bc75d-0d04-0410-961f-82ee72b054a4 Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."