From: | YANG Xudong <yangxudong(at)ymatrix(dot)cn> |
---|---|
To: | huchangqi <huchangqi(at)loongson(dot)cn> |
Cc: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, wengyanqing(at)ymatrix(dot)cn, wanghao(at)ymatrix(dot)cn |
Subject: | Re: [PATCH] Add loongarch native checksum implementation. |
Date: | 2023-07-06 10:30:30 |
Message-ID: | a1df9737-883a-5c01-2a71-c094fd47741b@ymatrix.cn |
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Thread: | |
Lists: | pgsql-hackers |
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 test buildfarm 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, but didn'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(at)ymatrix(dot)cn>
>> Send time:Wednesday, 07/05/2023 10:15:51
>> To: "John Naylor" <john(dot)naylor(at)enterprisedb(dot)com>
>> Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org, wengyanqing(at)ymatrix(dot)cn, wanghao(at)ymatrix(dot)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(at)ymatrix(dot)cn
>>>> <mailto:yangxudong(at)ymatrix(dot)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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