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RE: Improve CRC32C performance on SSE4.2 - Mailing list pgsql-hackers

From Devulapalli, Raghuveer
Subject RE: Improve CRC32C performance on SSE4.2
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Msg-id PH8PR11MB8286C653FD6629E0862FA07FFBD12@PH8PR11MB8286.namprd11.prod.outlook.com
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In response to Re: Improve CRC32C performance on SSE4.2  (John Naylor <johncnaylorls@gmail.com>)
Responses Re: Improve CRC32C performance on SSE4.2
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> I've gone ahead and added the generated AVX-512 algorithm in v14-0005

+ pg_attribute_target("avx512vl,vpclmulqdq")
+ pg_crc32c
+ pg_comp_crc32c_pclmul(pg_crc32c crc, const void *data, size_t length)

I'm a little confused. Why is v14 missing the earlier versions of pclmul implementation that works without avx-512? 

Raghuveer

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