linux-kernel - Re: [PATCH] ARM: do not assemble iwmmxt.S with LLVM toolchain

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Message-ID: <20200410165948.GD448831@lunn.ch>
Date:   Fri, 10 Apr 2020 18:59:48 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jian Cai <caij2003@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>, Peter.Smith@....com,
        stefan@...er.ch, David Howells <dhowells@...hat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        manojgupta@...gle.com,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        clang-built-linux@...glegroups.com, ilie.halip@...il.com,
        Masahiro Yamada <masahiroy@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        samitolvanen@...gle.com,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        jiancai@...gle.com, Doug Anderson <armlinux@...isordat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        ndesaulniers@...gle.com, linux-kernel@...r.kernel.org,
        Patrick Bellasi <patrick.bellasi@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ARM: do not assemble iwmmxt.S with LLVM toolchain

On Thu, Apr 09, 2020 at 04:27:26PM -0700, Jian Cai wrote:
> iwmmxt.S contains XScale instructions

Dumb question....

Are these Xscale instructions? My understanding is that they are an
instruction set of their own, implementing something similar to IA-32
MMX. 

Would it be more accurate to say CLANG does not support the iwmmxt
instruction set?

	    Andrew