From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 209C3C43381 for ; Sat, 30 Mar 2019 13:00:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB08E20700 for ; Sat, 30 Mar 2019 13:00:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730803AbfC3NAi (ORCPT ); Sat, 30 Mar 2019 09:00:38 -0400 Received: from mx.sdf.org ([205.166.94.20]:60213 "EHLO mx.sdf.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730787AbfC3NAi (ORCPT ); Sat, 30 Mar 2019 09:00:38 -0400 Received: from sdf.org (IDENT:lkml@sdf.lonestar.org [205.166.94.16]) by mx.sdf.org (8.15.2/8.14.5) with ESMTPS id x2UD0H1N014264 (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256 bits) verified NO); Sat, 30 Mar 2019 13:00:19 GMT Received: (from lkml@localhost) by sdf.org (8.15.2/8.12.8/Submit) id x2UD0H0C020934; Sat, 30 Mar 2019 13:00:17 GMT Date: Sat, 30 Mar 2019 13:00:17 GMT From: George Spelvin Message-Id: <201903301300.x2UD0H0C020934@sdf.org> To: heiko.carstens@de.ibm.com, lkml@sdf.org Subject: Re: CONFIG_ARCH_SUPPORTS_INT128: Why not mips, s390, powerpc, and alpha? Cc: linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org In-Reply-To: <201903301030.x2UAUNOg026448@sdf.org> References: <201903291307.x2TD772v013534@sdf.org>, <20190330084346.GA3801@osiris>, <201903301030.x2UAUNOg026448@sdf.org> Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org I've been tracking down when "umulditi3" support was added to various gcc platforms. So far, I've found: ia64: 2005-07-28, gcc 4.1.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=102463 mips: 2008-06-09, gcc 4.4.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=136600 alpha: 2013-02-01, gcc 4.8.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=195668 s390: 2011-10-07, gcc 4.7.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=179647 ppc64: 2013-02-01, gcc 4.8.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=195667 Here's a revised s390 patch. >From e8ea8c0a5d618385049248649b8c13717b598a42 Mon Sep 17 00:00:00 2001 From: George Spelvin Date: Sat, 30 Mar 2019 10:27:14 +0000 Subject: [PATCH v2] s390: Enable CONFIG_ARCH_SUPPORTS_INT128 on 64-bit builds If a platform supports a 64x64->128-bit widening multiply, that allows more efficient scaling of 64-bit values in various parts of the kernel. GCC advertises __int128 support with the __INT128__ #define, but we care about efficient inline support, so this is a separate flag. For s390, that was added on 2011-10-07 by https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=179647 which is part of GCC 4.7. Signed-off-by: George Spelvin --- arch/s390/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index ed554b09eb3f..6ddaee6573f4 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -372,6 +372,7 @@ endchoice config 64BIT def_bool y + select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 40700 || CC_IS_CLANG config COMPAT def_bool y -- 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Spelvin Subject: Re: CONFIG_ARCH_SUPPORTS_INT128: Why not mips, s390, powerpc, and alpha? Date: Sat, 30 Mar 2019 13:00:17 GMT Message-ID: <201903301300.x2UD0H0C020934@sdf.org> References: <201903291307.x2TD772v013534@sdf.org>, <20190330084346.GA3801@osiris>, <201903301030.x2UAUNOg026448@sdf.org> Return-path: In-Reply-To: <201903301030.x2UAUNOg026448@sdf.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@lists.ozlabs.org Sender: "Linuxppc-dev" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: heiko.carstens@de.ibm.com, lkml@sdf.org Cc: linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org, linux-alpha@vger.kernel.org I've been tracking down when "umulditi3" support was added to various gcc platforms. So far, I've found: ia64: 2005-07-28, gcc 4.1.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=102463 mips: 2008-06-09, gcc 4.4.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=136600 alpha: 2013-02-01, gcc 4.8.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=195668 s390: 2011-10-07, gcc 4.7.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=179647 ppc64: 2013-02-01, gcc 4.8.0 https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=195667 Here's a revised s390 patch. >From e8ea8c0a5d618385049248649b8c13717b598a42 Mon Sep 17 00:00:00 2001 From: George Spelvin Date: Sat, 30 Mar 2019 10:27:14 +0000 Subject: [PATCH v2] s390: Enable CONFIG_ARCH_SUPPORTS_INT128 on 64-bit builds If a platform supports a 64x64->128-bit widening multiply, that allows more efficient scaling of 64-bit values in various parts of the kernel. GCC advertises __int128 support with the __INT128__ #define, but we care about efficient inline support, so this is a separate flag. For s390, that was added on 2011-10-07 by https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=179647 which is part of GCC 4.7. Signed-off-by: George Spelvin --- arch/s390/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index ed554b09eb3f..6ddaee6573f4 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -372,6 +372,7 @@ endchoice config 64BIT def_bool y + select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 40700 || CC_IS_CLANG config COMPAT def_bool y -- 2.20.1