[RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[jiawei]

Hi all,

There is an agenda for tomorrow's meeting. If you have topics to
discuss or share, please let me know and I can add them to the agenda.

Agenda:





- Bump GCC default ISA spec and got bug report[1] for that.




-  RISC-V subextension  related implement progress

    - Scalar Crypto develop plan


    - Zmmul spec has forzen and toolchain implement of it


    - Zcea 'tablejump' instruction implement


[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104219

Wei Wu - PLCT Lab is inviting you to a scheduled Zoom meeting.

Topic: RISC-V GNU Toolchain Biweekly Sync-up

Join Zoom Meeting
https://zoom.com.cn/j/89393600951?pwd=ZFpWMkZ6Tm1TbUFXT1hZZjZZMHhRQT09

Meeting ID: 893 9360 0951
Passcode: 899662

BEIJING, China
11:00p    Thu, Jan 27 2022


12:00a    Fri, Jan 27 2022


PST/PDT, Pacific Standard Time (US)
7:00a    Thu, Jan 27 2022
8:00a    Thu, Jan 27 2022

PHILADELPHIA, United States, Pennsylvania
10:00a    Thu, Jan 27 2022
11:00a    Thu, Jan 27 2022

Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[Philipp Tomsich]

Hi all,

I won't be able to attend, as the IOMMU TG is convening in the same
timeslot tomorrow.
However, please be advised that (to my knowledge and after checking with
Stephano) the Zcea is on-hold and not frozen.

Thanks,
Philipp.

On Wed, 26 Jan 2022 at 14:05, <jiawei@iscas.ac.cn> wrote:

> Hi all,
>
> There is an agenda for tomorrow's meeting. If you have topics to
> discuss or share, please let me know and I can add them to the agenda.
>
> Agenda:
>
>
> - Bump GCC default ISA spec and got bug report[1] for that.
>
>
> -  RISC-V subextension  related implement progress
>
>     - Scalar Crypto develop plan
>
>     - Zmmul spec has forzen and toolchain implement of it
>
>     - Zcea 'tablejump' instruction implement
>
> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104219
>
> Wei Wu - PLCT Lab is inviting you to a scheduled Zoom meeting.
>
> Topic: RISC-V GNU Toolchain Biweekly Sync-up
>
> Join Zoom Meeting
> https://zoom.com.cn/j/89393600951?pwd=ZFpWMkZ6Tm1TbUFXT1hZZjZZMHhRQT09
>
> Meeting ID: 893 9360 0951
> Passcode: 899662
>
> BEIJING, China
> 11:00p    Thu, Jan 27 2022
>
> 12:00a    Fri, Jan 27 2022
>
> PST/PDT, Pacific Standard Time (US)
> 7:00a    Thu, Jan 27 2022
> 8:00a    Thu, Jan 27 2022
>
> PHILADELPHIA, United States, Pennsylvania
> 10:00a    Thu, Jan 27 2022
> 11:00a    Thu, Jan 27 2022
>
>

Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[Matthias Klose]

On 1/26/22 14:04, jiawei@iscas.ac.cn wrote:
> Hi all,
> 
> There is an agenda for tomorrow's meeting. If you have topics to
> discuss or share, please let me know and I can add them to the agenda.
> 
> Agenda:
> 
> 
> 
> 
> 
> - Bump GCC default ISA spec and got bug report[1] for that.

Tried to join the meeting, but it ended early apparently.

Using in Debian and Ubuntu binutils 2.38, I see then with GCC 11.2 warnings for
every link:

/usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
version 2.0 for 'i' extension, the output version is 2.1
/usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
version 2.0 for 'a' extension, the output version is 2.1
/usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
version 2.0 for 'f' extension, the output version is 2.2
/usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
version 2.0 for 'd' extension, the output version is 2.2

Are there any plans to backport the support for ISA 2.1/2.2 to GCC 11? Or do we
need to configure binutils to use 2.0 until the compiler is changed to GCC 12?

There's also no documentation about that change, at least in binutils. Should
that be mentioned in the release notes?

Thanks, Matthias

Re: Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[jiawei]

> -----原始邮件-----
&gt; 发件人: "Matthias Klose" <doko@ubuntu.com>
&gt; 发送时间: 2022-01-28 00:18:47 (星期五)
&gt; 收件人: jiawei@iscas.ac.cn, gcc@gcc.gnu.org, binutils@sourceware.org, gdb@sourceware.org, libc-alpha@sourceware.org
&gt; 抄送: cmuellner@ventanamicro.com, sinan@isrc.iscas.ac.cn, philipp.tomsich@vrull.eu, nelson.chu@sifive.com, wuwei2016@iscas.ac.cn, kito.cheng@sifive.com, yulong@nj.iscas.ac.cn, shihua@iscas.ac.cn
&gt; 主题: Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)
&gt; 
&gt; On 1/26/22 14:04, jiawei@iscas.ac.cn wrote:
&gt; &gt; Hi all,
&gt; &gt; 
&gt; &gt; There is an agenda for tomorrow's meeting. If you have topics to
&gt; &gt; discuss or share, please let me know and I can add them to the agenda.
&gt; &gt; 
&gt; &gt; Agenda:
&gt; &gt; 
&gt; &gt; 
&gt; &gt; 
&gt; &gt; 
&gt; &gt; 
&gt; &gt; - Bump GCC default ISA spec and got bug report[1] for that.
&gt; 
&gt; Tried to join the meeting, but it ended early apparently.
&gt; 
&gt; Using in Debian and Ubuntu binutils 2.38, I see then with GCC 11.2 warnings for
&gt; every link:
&gt; 
&gt; /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
&gt; version 2.0 for 'i' extension, the output version is 2.1
&gt; /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
&gt; version 2.0 for 'a' extension, the output version is 2.1
&gt; /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
&gt; version 2.0 for 'f' extension, the output version is 2.2
&gt; /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: mis-matched ISA
&gt; version 2.0 for 'd' extension, the output version is 2.2
&gt; 
&gt; Are there any plans to backport the support for ISA 2.1/2.2 to GCC 11? Or do we
&gt; need to configure binutils to use 2.0 until the compiler is changed to GCC 12?
&gt; 
&gt; There's also no documentation about that change, at least in binutils. Should
&gt; that be mentioned in the release notes?
&gt; 
&gt; Thanks, Matthias

Hi Matthias,

  Here is a link that Kito Cheng explain this change:

  https://groups.google.com/a/groups.riscv.org/g/sw-dev/c/aE1ZeHHCYf4

  I think you can use aditional option --with-isa-spec=2.2 to solve this problem

Good luck,
PLCT Jiawei

</doko@ubuntu.com>

Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[David Abdurachmanov via Gdb]

On Thu, Jan 27, 2022 at 6:21 PM Matthias Klose <doko@ubuntu.com> wrote:

> On 1/26/22 14:04, jiawei@iscas.ac.cn wrote:
> > Hi all,
> >
> > There is an agenda for tomorrow's meeting. If you have topics to
> > discuss or share, please let me know and I can add them to the agenda.
> >
> > Agenda:
> >
> >
> >
> >
> >
> > - Bump GCC default ISA spec and got bug report[1] for that.
>
> Tried to join the meeting, but it ended early apparently.
>
> Using in Debian and Ubuntu binutils 2.38, I see then with GCC 11.2
> warnings for
> every link:
>
> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
> mis-matched ISA
> version 2.0 for 'i' extension, the output version is 2.1
> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
> mis-matched ISA
> version 2.0 for 'a' extension, the output version is 2.1
> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
> mis-matched ISA
> version 2.0 for 'f' extension, the output version is 2.2
> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
> mis-matched ISA
> version 2.0 for 'd' extension, the output version is 2.2
>
> Are there any plans to backport the support for ISA 2.1/2.2 to GCC 11? Or
> do we
> need to configure binutils to use 2.0 until the compiler is changed to GCC
> 12?
>

There are a few packages that will be broken (because they set -march
assuming the old standard). Things like kernel (patch proposed), opensbi
(patch proposed), u-boot, grub and similar. Kudos to Aurelien Jarno for
sending these patches already.

The warnings can be ignored here IIRC. The patch was proposed back in
December:
[PATCH 1/2] RISC-V: Don't report mismatch warnings when versions are larger
than 1.0.
https://sourceware.org/pipermail/binutils/2021-December/119060.html

But it wasn't committed yet. The patch was part of the series to change
default ISA to 20191213.

IIUC all combinations:
- GCC 12 + binutils 2.38
- GCC 11 + binutils 2.37
- GCC 12 + binutils 2.37
are valid, but you might want to use --with-isa-spec=2.2 for now until some
of the packages are patched.

Cheers,
david


>
> There's also no documentation about that change, at least in binutils.
> Should
> that be mentioned in the release notes?
>
> Thanks, Matthias
>

Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)

[Matthias Klose]

On 1/28/22 11:06, David Abdurachmanov wrote:
> On Thu, Jan 27, 2022 at 6:21 PM Matthias Klose <doko@ubuntu.com> wrote:
> 
>> On 1/26/22 14:04, jiawei@iscas.ac.cn wrote:
>>> Hi all,
>>>
>>> There is an agenda for tomorrow's meeting. If you have topics to
>>> discuss or share, please let me know and I can add them to the agenda.
>>>
>>> Agenda:
>>>
>>>
>>>
>>>
>>>
>>> - Bump GCC default ISA spec and got bug report[1] for that.
>>
>> Tried to join the meeting, but it ended early apparently.
>>
>> Using in Debian and Ubuntu binutils 2.38, I see then with GCC 11.2
>> warnings for
>> every link:
>>
>> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
>> mis-matched ISA
>> version 2.0 for 'i' extension, the output version is 2.1
>> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
>> mis-matched ISA
>> version 2.0 for 'a' extension, the output version is 2.1
>> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
>> mis-matched ISA
>> version 2.0 for 'f' extension, the output version is 2.2
>> /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o:
>> mis-matched ISA
>> version 2.0 for 'd' extension, the output version is 2.2
>>
>> Are there any plans to backport the support for ISA 2.1/2.2 to GCC 11? Or
>> do we
>> need to configure binutils to use 2.0 until the compiler is changed to GCC
>> 12?
>>
> 
> There are a few packages that will be broken (because they set -march
> assuming the old standard). Things like kernel (patch proposed), opensbi
> (patch proposed), u-boot, grub and similar. Kudos to Aurelien Jarno for
> sending these patches already.

seems to be a bit more ...
we are seeing a lot of build failures building parts of the KDE stack.
https://launchpadlibrarian.net/582482377/buildlog_ubuntu-jammy-riscv64.ktexteditor_5.90.0-0ubuntu2_BUILDING.txt.gz

while you see only warnings, the linker errors out.

Also GCC 11 fails to build with binutils 2.38:

libtool: link: `sstream-inst.lo' is not a valid libtool object
make[8]: *** [Makefile:633: libc++11convenience.la] Error 1


Is there a plan, or procedure to follow doing this ISA change for a set of
packages, e.g. building packages in a particular order?

> The warnings can be ignored here IIRC. The patch was proposed back in
> December:
> [PATCH 1/2] RISC-V: Don't report mismatch warnings when versions are larger
> than 1.0.
> https://sourceware.org/pipermail/binutils/2021-December/119060.html
> 
> But it wasn't committed yet. The patch was part of the series to change
> default ISA to 20191213.
> 
> IIUC all combinations:
> - GCC 12 + binutils 2.38
> - GCC 11 + binutils 2.37
> - GCC 12 + binutils 2.37
> are valid, but you might want to use --with-isa-spec=2.2 for now until some
> of the packages are patched.

so this leaves "GCC 11 + binutils 2.38" as invalid.  binutils 2.38 will be
released before GCC 12, that is what people will be using. IMO the binutils 2.38
release should default to the old ISA.

Matthias