From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8354 invoked by alias); 13 Jan 2012 18:54:51 -0000 Received: (qmail 8336 invoked by uid 22791); 13 Jan 2012 18:54:50 -0000 X-SWARE-Spam-Status: No, hits=-2.2 required=5.0 tests=AWL,BAYES_00,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from gw.kuantic.com (HELO gw.kuantic.com) (213.244.28.44) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 13 Jan 2012 18:54:28 +0000 Received: from [10.0.0.43] (dellbf.kuantic.com [10.0.0.43]) (authenticated bits=0) by gw.kuantic.com (8.14.5/8.14.4) with ESMTP id q0DIsQUG026820 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Fri, 13 Jan 2012 19:54:26 +0100 Message-ID: <4F107DE4.7080706@kuantic.com> Date: Fri, 13 Jan 2012 18:54:00 -0000 From: =?ISO-8859-1?Q?Bernard_Fouch=E9?= User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20111105 Thunderbird/8.0 MIME-Version: 1.0 To: ecos-devel@ecos.sourceware.org Subject: Re: Gnutools: consideration for upgrade to GCC 4.6 References: <4F106345.4080902@siva.com.mk> In-Reply-To: <4F106345.4080902@siva.com.mk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-IsSubscribed: yes Mailing-List: contact ecos-devel-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: ecos-devel-owner@ecos.sourceware.org X-SW-Source: 2012-01/txt/msg00004.txt.bz2 Le 13/01/2012 18:00, Ilija Kocho a écrit : > > Our GCC 4.3.2 is ageing and perhaps we should consider an upgrade. > My motive is it's lacking of support for Cortex-M4 SIMD (aka DSP) and > FPU instructions, but I think that other architectures shall gain from > newer compiler too. I have made some signal processing tests with GCC > 4.6.2 against current eCos compiler and they show performance gain > even with Cortex-M3 setting, though moderate. Performance is > considerable when Cortex-M4 setting is selected and is tremendous, as > expected, when SIMD are used. Recently introduced Cortex-M products > with FPU (Kinetis K70, K61, STM32F4) will further emphasise the benefit. > That sounds good! Did you try link time optimization ? I'm curious what kind of gain it could bring with a real world app. eCos seems to fit perfectly for such an optimization, there is no shared lib and at link time everythink is visible to the linker.