From: Nathan Chancellor <natechancellor@gmail.com>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2] powerpc: slightly improve cache helpers
Date: Thu, 18 Jul 2019 20:24:56 -0700 [thread overview]
Message-ID: <20190719032456.GA14108@archlinux-threadripper> (raw)
In-Reply-To: <20190709064952.GA40851@archlinux-threadripper>
On Mon, Jul 08, 2019 at 11:49:52PM -0700, Nathan Chancellor wrote:
> On Tue, Jul 09, 2019 at 07:04:43AM +0200, Christophe Leroy wrote:
> > Is that a Clang bug ?
>
> No idea, it happens with clang-8 and clang-9 though (pretty sure there
> were fixes for PowerPC in clang-8 so something before it probably won't
> work but I haven't tried).
>
> >
> > Do you have a disassembly of the code both with and without this patch in
> > order to compare ?
>
> I can give you whatever disassembly you want (or I can upload the raw
> files if that is easier).
>
> Cheers,
> Nathan
Hi Christophe and Segher,
What disassembly/files did you need to start taking a look at this? I
can upload/send whatever you need.
If it is easier, we have a self contained clang build script available
to make it easier to reproduce this on your side (does assume an x86_64
host):
https://github.com/ClangBuiltLinux/tc-build
Cheers,
Nathan
WARNING: multiple messages have this Message-ID (diff)
From: Nathan Chancellor <natechancellor@gmail.com>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Segher Boessenkool <segher@kernel.crashing.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com
Subject: Re: [PATCH v2] powerpc: slightly improve cache helpers
Date: Thu, 18 Jul 2019 20:24:56 -0700 [thread overview]
Message-ID: <20190719032456.GA14108@archlinux-threadripper> (raw)
In-Reply-To: <20190709064952.GA40851@archlinux-threadripper>
On Mon, Jul 08, 2019 at 11:49:52PM -0700, Nathan Chancellor wrote:
> On Tue, Jul 09, 2019 at 07:04:43AM +0200, Christophe Leroy wrote:
> > Is that a Clang bug ?
>
> No idea, it happens with clang-8 and clang-9 though (pretty sure there
> were fixes for PowerPC in clang-8 so something before it probably won't
> work but I haven't tried).
>
> >
> > Do you have a disassembly of the code both with and without this patch in
> > order to compare ?
>
> I can give you whatever disassembly you want (or I can upload the raw
> files if that is easier).
>
> Cheers,
> Nathan
Hi Christophe and Segher,
What disassembly/files did you need to start taking a look at this? I
can upload/send whatever you need.
If it is easier, we have a self contained clang build script available
to make it easier to reproduce this on your side (does assume an x86_64
host):
https://github.com/ClangBuiltLinux/tc-build
Cheers,
Nathan
next prev parent reply other threads:[~2019-07-19 3:27 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-10 9:24 [PATCH v2] powerpc: slightly improve cache helpers Christophe Leroy
2019-05-10 9:24 ` Christophe Leroy
2019-07-08 1:19 ` Michael Ellerman
2019-07-08 19:14 ` Nathan Chancellor
2019-07-08 19:14 ` Nathan Chancellor
2019-07-09 5:04 ` Christophe Leroy
2019-07-09 5:04 ` Christophe Leroy
2019-07-09 6:49 ` Nathan Chancellor
2019-07-09 6:49 ` Nathan Chancellor
2019-07-19 3:24 ` Nathan Chancellor [this message]
2019-07-19 3:24 ` Nathan Chancellor
2019-07-19 15:23 ` Segher Boessenkool
2019-07-19 15:23 ` Segher Boessenkool
2019-07-19 16:04 ` Nathan Chancellor
2019-07-19 16:04 ` Nathan Chancellor
2019-07-21 7:58 ` Nathan Chancellor
2019-07-21 7:58 ` Nathan Chancellor
2019-07-21 18:01 ` Segher Boessenkool
2019-07-21 18:01 ` Segher Boessenkool
2019-07-22 2:41 ` Nathan Chancellor
2019-07-22 2:41 ` Nathan Chancellor
2019-07-22 6:19 ` Segher Boessenkool
2019-07-22 6:19 ` Segher Boessenkool
2019-07-22 17:21 ` Nick Desaulniers
2019-07-22 17:21 ` Nick Desaulniers
2019-07-22 17:58 ` Segher Boessenkool
2019-07-22 17:58 ` Segher Boessenkool
2019-07-25 21:30 ` Nick Desaulniers
2019-07-25 21:30 ` Nick Desaulniers
2019-07-29 20:28 ` Nick Desaulniers
2019-07-29 20:28 ` Nick Desaulniers
2019-07-22 10:15 ` Michael Ellerman
2019-07-22 10:15 ` Michael Ellerman
2019-07-22 15:18 ` Segher Boessenkool
2019-07-22 15:18 ` Segher Boessenkool
2019-07-22 23:21 ` Michael Ellerman
2019-07-22 23:21 ` Michael Ellerman
2019-07-25 13:22 ` Segher Boessenkool
2019-07-25 13:22 ` Segher Boessenkool
2019-07-22 0:53 ` [PATCH] powerpc: Test broken dcbz kbuild test robot
2019-07-22 0:53 ` kbuild test robot
2019-07-09 13:35 ` [PATCH v2] powerpc: slightly improve cache helpers Segher Boessenkool
2019-07-09 13:35 ` Segher Boessenkool
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