From: Nathan Chancellor <natechancellor@gmail.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
LKML <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org, kbuild test robot <lkp@intel.com>
Subject: Re: [PATCH] powerpc: workaround clang codegen bug in dcbz
Date: Mon, 29 Jul 2019 13:47:55 -0700 [thread overview]
Message-ID: <20190729204755.GA118622@archlinux-threadripper> (raw)
In-Reply-To: <CAKwvOdm7GRBWYhPy4Ni2jbsXJp8gDF-AqaAxeLbZ03+LvHxADQ@mail.gmail.com>
On Mon, Jul 29, 2019 at 01:45:35PM -0700, Nick Desaulniers wrote:
> On Mon, Jul 29, 2019 at 1:32 PM Nathan Chancellor
> <natechancellor@gmail.com> wrote:
> >
> > On Mon, Jul 29, 2019 at 01:25:41PM -0700, Nick Desaulniers wrote:
> > > But I'm not sure how the inlined code generated would be affected.
> >
> > For the record:
> >
> > https://godbolt.org/z/z57VU7
> >
> > This seems consistent with what Michael found so I don't think a revert
> > is entirely unreasonable.
>
> Thanks for debugging/reporting/testing and the Godbolt link which
> clearly shows that the codegen for out of line versions is no
> different. The case I can't comment on is what happens when those
> `static inline` functions get inlined (maybe the original patch
> improves those cases?).
> --
> Thanks,
> ~Nick Desaulniers
I'll try to build with various versions of GCC and compare the
disassembly of the one problematic location that I found and see
what it looks like.
Cheers,
Nathan
WARNING: multiple messages have this Message-ID (diff)
From: Nathan Chancellor <natechancellor@gmail.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Segher Boessenkool <segher@kernel.crashing.org>,
Arnd Bergmann <arnd@arndb.de>, kbuild test robot <lkp@intel.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org,
LKML <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: [PATCH] powerpc: workaround clang codegen bug in dcbz
Date: Mon, 29 Jul 2019 13:47:55 -0700 [thread overview]
Message-ID: <20190729204755.GA118622@archlinux-threadripper> (raw)
In-Reply-To: <CAKwvOdm7GRBWYhPy4Ni2jbsXJp8gDF-AqaAxeLbZ03+LvHxADQ@mail.gmail.com>
On Mon, Jul 29, 2019 at 01:45:35PM -0700, Nick Desaulniers wrote:
> On Mon, Jul 29, 2019 at 1:32 PM Nathan Chancellor
> <natechancellor@gmail.com> wrote:
> >
> > On Mon, Jul 29, 2019 at 01:25:41PM -0700, Nick Desaulniers wrote:
> > > But I'm not sure how the inlined code generated would be affected.
> >
> > For the record:
> >
> > https://godbolt.org/z/z57VU7
> >
> > This seems consistent with what Michael found so I don't think a revert
> > is entirely unreasonable.
>
> Thanks for debugging/reporting/testing and the Godbolt link which
> clearly shows that the codegen for out of line versions is no
> different. The case I can't comment on is what happens when those
> `static inline` functions get inlined (maybe the original patch
> improves those cases?).
> --
> Thanks,
> ~Nick Desaulniers
I'll try to build with various versions of GCC and compare the
disassembly of the one problematic location that I found and see
what it looks like.
Cheers,
Nathan
next prev parent reply other threads:[~2019-07-29 20:51 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 20:25 [PATCH] powerpc: workaround clang codegen bug in dcbz Nick Desaulniers
2019-07-29 20:25 ` Nick Desaulniers
2019-07-29 20:32 ` Nathan Chancellor
2019-07-29 20:32 ` Nathan Chancellor
2019-07-29 20:45 ` Nick Desaulniers
2019-07-29 20:45 ` Nick Desaulniers
2019-07-29 20:47 ` Nathan Chancellor [this message]
2019-07-29 20:47 ` Nathan Chancellor
2019-07-29 20:49 ` Nick Desaulniers
2019-07-29 20:49 ` Nick Desaulniers
2019-07-29 21:52 ` Segher Boessenkool
2019-07-29 21:52 ` Segher Boessenkool
2019-07-30 7:34 ` Arnd Bergmann
2019-07-30 7:34 ` Arnd Bergmann
2019-07-30 11:17 ` Michael Ellerman
2019-07-30 11:17 ` Michael Ellerman
2019-08-09 18:21 ` [PATCH] powerpc: fix inline asm constraints for dcbz Nick Desaulniers
2019-08-09 18:21 ` Nick Desaulniers
2019-08-09 18:28 ` Arnd Bergmann
2019-08-09 18:28 ` Arnd Bergmann
2019-08-09 20:03 ` Christophe Leroy
2019-08-09 20:03 ` Christophe Leroy
2019-08-09 20:12 ` Arnd Bergmann
2019-08-09 20:12 ` Arnd Bergmann
2019-08-09 22:03 ` Nick Desaulniers
2019-08-09 22:03 ` Nick Desaulniers
2019-08-09 22:10 ` Segher Boessenkool
2019-08-09 22:10 ` Segher Boessenkool
2019-08-09 22:00 ` Segher Boessenkool
2019-08-09 22:00 ` Segher Boessenkool
2019-08-09 22:03 ` [PATCH v3] Revert "powerpc: slightly improve cache helpers" Nick Desaulniers
2019-08-09 22:03 ` Nick Desaulniers
2019-08-10 9:09 ` Michael Ellerman
2019-08-10 9:09 ` Michael Ellerman
2019-08-09 21:55 ` [PATCH] powerpc: fix inline asm constraints for dcbz Segher Boessenkool
2019-08-09 21:55 ` Segher Boessenkool
2019-08-09 20:36 ` Nathan Chancellor
2019-08-09 20:36 ` Nathan Chancellor
2019-07-30 13:48 ` [PATCH] powerpc: workaround clang codegen bug in dcbz Segher Boessenkool
2019-07-30 13:48 ` Segher Boessenkool
2019-07-30 14:30 ` Arnd Bergmann
2019-07-30 14:30 ` Arnd Bergmann
2019-07-30 16:16 ` Segher Boessenkool
2019-07-30 16:16 ` Segher Boessenkool
2019-07-30 17:07 ` Segher Boessenkool
2019-07-30 18:24 ` Arnd Bergmann
2019-07-30 18:24 ` Arnd Bergmann
2019-07-30 18:24 ` Arnd Bergmann
2019-07-30 19:35 ` Segher Boessenkool
2019-07-30 19:35 ` Segher Boessenkool
2019-07-30 5:31 ` Christophe Leroy
2019-07-30 5:31 ` Christophe Leroy
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