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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDA80C6FD18 for ; Wed, 19 Apr 2023 22:15:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229461AbjDSWPR (ORCPT ); Wed, 19 Apr 2023 18:15:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229812AbjDSWPP (ORCPT ); Wed, 19 Apr 2023 18:15:15 -0400 Received: from elvis.franken.de (elvis.franken.de [193.175.24.41]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C883E4C06 for ; Wed, 19 Apr 2023 15:15:13 -0700 (PDT) Received: from uucp (helo=alpha) by elvis.franken.de with local-bsmtp (Exim 3.36 #1) id 1ppG52-0007kL-00; Thu, 20 Apr 2023 00:15:12 +0200 Received: by alpha.franken.de (Postfix, from userid 1000) id D827AC0117; Thu, 20 Apr 2023 00:15:00 +0200 (CEST) Date: Thu, 20 Apr 2023 00:15:00 +0200 From: Thomas Bogendoerfer To: Nick Desaulniers Cc: Jiaxun Yang , "linux-mips@vger.kernel.org" , llvm@lists.linux.dev, Nathan Chancellor Subject: Re: [PATCH v2 6/7] MIPS: Fallback CPU -march CFLAG to ISA level if unsupported Message-ID: <20230419221500.GA17797@alpha.franken.de> References: <20230414080701.15503-1-jiaxun.yang@flygoat.com> <20230414080701.15503-7-jiaxun.yang@flygoat.com> <550FCA0F-2C48-4133-85B0-D9494CC1C23C@flygoat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On Wed, Apr 19, 2023 at 02:35:02PM -0700, Nick Desaulniers wrote: > On Wed, Apr 19, 2023 at 9:50 AM Jiaxun Yang wrote: > > > > > > > > > 2023年4月18日 21:07，Nick Desaulniers 写道： > > > > > > On Fri, Apr 14, 2023 at 1:07 AM Jiaxun Yang wrote: > > >> > > >> LLVM does not implement some of -march options. However those options > > >> are not mandatory for kernel to build for those CPUs. > > >> > > >> Fallback -march CFLAG to ISA level if unsupported by toolchain so > > >> we can get those kernel to build with LLVM. > > >> > > >> Link: https://github.com/ClangBuiltLinux/linux/issues/1544 > > >> Reported-by: Nathan Chancellor > > >> Signed-off-by: Jiaxun Yang > > > > > > Thanks for the patch! Maybe it's more obvious to folks who work on > > > mips, but how did you determine that say `p5600` is `mips32r5` or > > > `r10000` is `mips4`? > > > > Wikipedia [1] should fit the purpose. > > > > [1]: https://en.wikipedia.org/wiki/List_of_MIPS_architecture_processors > > Mostly! Though I was not able to verify: > - p5600 mips32r5 > - r5500 mips4 > - rm5200 mips4 > - sb1 mips64r1 all information taken from datasheets. > - loongson* probably depends on the exact type, but as I don't have datasheets I can't say what it is exactly, probaly mips32r2/mips64r2. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]