linux-kernel - Re: [PATCH] ARM: xor-neon: Replace __GNUC__ checks with CONFIG_CC_IS

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Date:   Fri, 31 May 2019 13:06:13 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Nicolas Pitre <nico@...xnic.net>,
        Stefan Agner <stefan@...er.ch>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] ARM: xor-neon: Replace __GNUC__ checks with CONFIG_CC_IS_GCC

On Fri, May 31, 2019 at 12:21 PM Arnd Bergmann <arnd@...db.de> wrote:
> clang, I would suggest dropping your patch then, and instead adding

I disagree.  The minimum version of gcc required to build the kernel
is 4.6, so the comment about older versions of gcc is irrelevant and
should be removed.

Nathan's -Rpass warnings are warning that vectorization was not
calculated to be profitable **for 1 of the 4 functions** by LLVM.
Surely we wouldn't disable NEON opts for XOR because 1 of 4 was not
vectorized?

-- 
Thanks,
~Nick Desaulniers