From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26985 invoked by alias); 13 Feb 2014 07:16:14 -0000 Mailing-List: contact gcc-help-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-help-owner@gcc.gnu.org Received: (qmail 26971 invoked by uid 89); 13 Feb 2014 07:16:13 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-4.0 required=5.0 tests=AWL,BAYES_00,RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: mail2-relais-roc.national.inria.fr Received: from mail2-relais-roc.national.inria.fr (HELO mail2-relais-roc.national.inria.fr) (192.134.164.83) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (CAMELLIA256-SHA encrypted) ESMTPS; Thu, 13 Feb 2014 07:16:12 +0000 Received: from ip-103.net-81-220-142.rev.numericable.fr (HELO laptop-mg.local) ([81.220.142.103]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-SHA; 13 Feb 2014 08:16:09 +0100 Date: Thu, 13 Feb 2014 07:16:00 -0000 From: Marc Glisse Reply-To: gcc-help@gcc.gnu.org To: chronicle cc: gcc-help@gcc.gnu.org Subject: Re: Dead code elimination PROBLEM In-Reply-To: <52FC6E56.80608@ceis.cujae.edu.cu> Message-ID: References: <52FC6E56.80608@ceis.cujae.edu.cu> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-SW-Source: 2014-02/txt/msg00072.txt.bz2 (please don't multi-post to gcc and gcc-help) On Thu, 13 Feb 2014, chronicle wrote: > ( do i need to make any kind of PHI nodes Yes you do need PHI nodes. Why don't you compile a piece of C code that does exactly the same and see what the compiler turns it into? In particular, you will notice that there are never multiple _1=... statements. -- Marc Glisse