Re: [PATCH v2] genksyms: Support arm64 CRC32 hardware acceleration1~

["Wentao Guan" <guanwentao@uniontech.com>]

>On 5/25/26 10:02 AM, Wentao Guan wrote:
>>> Additionally, many distributions already switched to gendwarfksyms last
>>> year. Unless someone provides a good reason to keep genksyms around,
>>> I expect it will be deprecated soon and eventually removed. It would be
>>> more valuable to show whether the same optimization is worthwhile for
>>> gendwarfksyms.
>> I see gendwarfksyms use crc32 from <zlib.h>, which from zlib1g-dev and zlib1g.
>
> Ah, I forgot about this, so gendwarfksyms should already be well
> optimized. I think that is the most important thing.

Which way do you prefer? There are two ways now:
1. this work,
2. import zlib like gendwarfksyms and remove the huge crctab,
but need make sure any arch do not cause performance regression?
(Assert the user libs precompile with +crc32 is right?)
I do some early tests show that:
1) zlib in x86 fast than genksym software
2) zlib in arm64 debian precompile slow than genksym software(crc32 not in armv8)
3) zlib in arm64 recompile with +crc32 same speed with genksyms hardware

BRs
Wentao Guan