Re: [PATCH] Add loongarch native checksum implementation.

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From: huchangqi <huchangqi@loongson.cn>
To: YANG Xudong <yangxudong@ymatrix.cn>
Subject: Re: [PATCH] Add loongarch native checksum implementation.
Date: Tue, 25 Jul 2023 15:51:43 +0800

Both cisticola and nuthatch are on the buildfarm now。

cisticola is "old world ABI".
https://buildfarm.postgresql.org/cgi-bin/show_history.pl?nm=cisticola&br=HEAD

nuthatch is "new world ABI".
https://buildfarm.postgresql.org/cgi-bin/show_history.pl?nm=nuthatch&br=HEAD

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Best regards,
huchangqi

YANG Xudong <yangxudong@ymatrix.cn> writes:

> On 2023/7/6 15:14, huchangqi wrote:
>> Hi, i have a loongarch machine runing Loongnix-server (based on redhat/centos, it has gcc-8.3 on it), i am trying to
testbuildfarm on it, when i edit build-farm.conf it seems to need animal and secret to connect the buildfarm server. 
>> then i go to  https://buildfarm.postgresql.org/cgi-bin/register-form.pl, and registered the buildfarm  a week ago,
butdidn't receive any response. so what else i need to do next. 
>>
>>
>
> Is it possible to provide a build farm instance for new world ABI of
> loongarch also by loongson? It will be really appreciated.
>
> Thanks!
>
>>
>>> -----Original Messages-----
>>> From: "YANG Xudong" <yangxudong@ymatrix.cn>
>>> Send time:Wednesday, 07/05/2023 10:15:51
>>> To: "John Naylor" <john.naylor@enterprisedb.com>
>>> Cc: pgsql-hackers@lists.postgresql.org, wengyanqing@ymatrix.cn, wanghao@ymatrix.cn
>>> Subject: Re: [PATCH] Add loongarch native checksum implementation.
>>>
>>> Is there any other comment?
>>>
>>> If the patch looks OK, I would like to update its status to ready for
>>> committer in the commitfest.
>>>
>>> Thanks!
>>>
>>> On 2023/6/16 09:28, YANG Xudong wrote:
>>>> Updated the patch based on the comments.
>>>>
>>>> On 2023/6/15 18:30, John Naylor wrote:
>>>>>
>>>>> On Wed, Jun 14, 2023 at 9:20 AM YANG Xudong <yangxudong@ymatrix.cn
>>>>> <mailto:yangxudong@ymatrix.cn>> wrote:
>>>>>   >
>>>>>   > Attached a new patch with fixes based on the comment below.
>>>>>
>>>>> Note: It's helpful to pass "-v" to git format-patch, to have different
>>>>> versions.
>>>>>
>>>>
>>>> Added v2
>>>>
>>>>>   > > For x86 and Arm, if it fails to link without an -march flag, we
>>>>> allow
>>>>>   > > for a runtime check. The flags "-march=armv8-a+crc" and
>>>>> "-msse4.2" are
>>>>>   > > for instructions not found on all platforms. The patch also
>>>>> checks both
>>>>>   > > ways, and each one results in "Use LoongArch CRC instruction
>>>>>   > > unconditionally". The -march flag here is general, not specific. In
>>>>>   > > other words, if this only runs inside "+elif host_cpu ==
>>>>> 'loongarch64'",
>>>>>   > > why do we need both with -march and without?
>>>>>   > >
>>>>>   >
>>>>>   > Removed the elif branch.
>>>>>
>>>>> Okay, since we've confirmed that no arch flag is necessary, some other
>>>>> places can be simplified:
>>>>>
>>>>> --- a/src/port/Makefile
>>>>> +++ b/src/port/Makefile
>>>>> @@ -98,6 +98,11 @@ pg_crc32c_armv8.o: CFLAGS+=$(CFLAGS_CRC)
>>>>>    pg_crc32c_armv8_shlib.o: CFLAGS+=$(CFLAGS_CRC)
>>>>>    pg_crc32c_armv8_srv.o: CFLAGS+=$(CFLAGS_CRC)
>>>>>
>>>>> +# all versions of pg_crc32c_loongarch.o need CFLAGS_CRC
>>>>> +pg_crc32c_loongarch.o: CFLAGS+=$(CFLAGS_CRC)
>>>>> +pg_crc32c_loongarch_shlib.o: CFLAGS+=$(CFLAGS_CRC)
>>>>> +pg_crc32c_loongarch_srv.o: CFLAGS+=$(CFLAGS_CRC)
>>>>>
>>>>> This was copy-and-pasted from platforms that use a runtime check, so
>>>>> should be unnecessary.
>>>>>
>>>>
>>>> Removed these lines.
>>>>
>>>>> +# If the intrinsics are supported, sets
>>>>> pgac_loongarch_crc32c_intrinsics,
>>>>> +# and CFLAGS_CRC.
>>>>>
>>>>> +# Check if __builtin_loongarch_crcc_* intrinsics can be used
>>>>> +# with the default compiler flags.
>>>>> +# CFLAGS_CRC is set if the extra flag is required.
>>>>>
>>>>> Same here -- it seems we don't need to set CFLAGS_CRC at all. Can you
>>>>> confirm?
>>>>>
>>>>
>>>> We don't need to set CFLAGS_CRC as commented. I have updated the
>>>> configure script to make it align with the logic in meson build script.
>>>>
>>>>>   > > Also, I don't have a Loongarch machine for testing. Could you
>>>>> show that
>>>>>   > > the instructions are found in the binary, maybe using objdump and
>>>>> grep?
>>>>>   > > Or a performance test?
>>>>>   > >
>>>>>   >
>>>>>   > The output of the objdump command `objdump -dS
>>>>>   > ../postgres-build/tmp_install/usr/local/pgsql/bin/postgres  | grep
>>>>> -B 30
>>>>>   > -A 10 crcc` is attached.
>>>>>
>>>>> Thanks for confirming.
>>>>>
>>>>> --
>>>>> John Naylor
>>>>> EDB: http://www.enterprisedb.com <http://www.enterprisedb.com>
>>>
>>
>>
>>
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