From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Monjalon Subject: Re: [PATCH 1/3] eal/x86: fix build with clang for old AVX Date: Thu, 04 Feb 2016 09:47:54 +0100 Message-ID: <2848756.Pj2zKKyaol@xps13> References: <1454525799-25552-1-git-send-email-thomas.monjalon@6wind.com> <1454525799-25552-2-git-send-email-thomas.monjalon@6wind.com> <8F6C2BD409508844A0EFC19955BE0941033ACABA@SHSMSX103.ccr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: dev@dpdk.org To: "Wang, Zhihong" Return-path: Received: from mail-wm0-f48.google.com (mail-wm0-f48.google.com [74.125.82.48]) by dpdk.org (Postfix) with ESMTP id 7DF1EDE0 for ; Thu, 4 Feb 2016 09:49:08 +0100 (CET) Received: by mail-wm0-f48.google.com with SMTP id l66so15675053wml.0 for ; Thu, 04 Feb 2016 00:49:08 -0800 (PST) In-Reply-To: <8F6C2BD409508844A0EFC19955BE0941033ACABA@SHSMSX103.ccr.corp.intel.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" 2016-02-04 03:35, Wang, Zhihong: > > Subject: [PATCH 1/3] eal/x86: fix build with clang for old AVX > > > > When configuring RTE_MACHINE to "default", rte_memcpy implementation > > is the default one (old AVX). > > In this code, clang raises a warning thanks to -Wsometimes-uninitialized: > > > > rte_memcpy.h:838:6: error: > > variable 'srcofs' is used uninitialized whenever 'if' condition is false > > if (dstofss > 0) { > > ^~~~~~~~~~~ > > rte_memcpy.h:849:6: note: uninitialized use occurs here > > if (srcofs == 0) { > > ^~~~~~ > > > > It is fixed by initializing srcofs to 0. > > > > Fixes: 1ae817f9f887 ("eal/x86: tune memcpy for platforms without AVX512") > > Hi Thomas, > > Thanks for pointing this out! > My last hasty modification on this is not correct. > > The patch below will fix it. All modifications are tested. > Sorry for all the hassle! :'( > > "srcofs" should be calculated based on source address anyway. OK Please send a full patch as usual, thanks.