From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 13327 invoked by alias); 9 Aug 2012 16:55:55 -0000 Received: (qmail 13317 invoked by uid 22791); 9 Aug 2012 16:55:53 -0000 X-SWARE-Spam-Status: No, hits=-2.2 required=5.0 tests=AWL,BAYES_00,KHOP_THREADED,RDNS_NONE X-Spam-Check-By: sourceware.org Received: from Unknown (HELO mel.act-europe.fr) (194.98.77.210) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 09 Aug 2012 16:55:17 +0000 Received: from localhost (localhost [127.0.0.1]) by filtered-smtp.eu.adacore.com (Postfix) with ESMTP id ADB0D290031; Thu, 9 Aug 2012 18:54:16 +0200 (CEST) Received: from mel.act-europe.fr ([127.0.0.1]) by localhost (smtp.eu.adacore.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3X0-nffGs-xv; Thu, 9 Aug 2012 18:54:16 +0200 (CEST) Received: from hermes.site (ADijon-552-1-144-143.w90-13.abo.wanadoo.fr [90.13.247.143]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mel.act-europe.fr (Postfix) with ESMTP id 7B402290024; Thu, 9 Aug 2012 18:54:16 +0200 (CEST) From: Eric Botcazou To: Richard Henderson Subject: Re: s390: Avoid CAS boolean output inefficiency Date: Thu, 09 Aug 2012 16:55:00 -0000 User-Agent: KMail/1.13.5 (Linux/2.6.34.10-0.6-desktop; KDE/4.4.4; x86_64; ; ) Cc: gcc-patches@gcc.gnu.org, Ulrich Weigand References: <201208061834.q76IY8HS013445@d06av02.portsmouth.uk.ibm.com> <502047E4.50304@redhat.com> In-Reply-To: <502047E4.50304@redhat.com> MIME-Version: 1.0 Message-Id: <201208091854.08576.ebotcazou@adacore.com> Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit 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 X-SW-Source: 2012-08/txt/msg00551.txt.bz2 > This was caused (or perhaps abetted by) the representation of EQ > as NE ^ 1. With the subsequent truncation and zero-extend, I > think combine reached its insn limit of 3 before seeing everything > it needed to see. This can be 4 now, if you tweak the initial heuristic. -- Eric Botcazou