Re: What exactly is our CRC algorithm?

From: Abhijit Menon-Sen <ams(at)2ndQuadrant(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Cc: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>
Subject: Re: What exactly is our CRC algorithm?
Date: 2015-01-01 07:17:23
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OK, here are the patches with the various suggestions applied.

I found that the alignment didn't seem to make much difference for the
CRC32* instructions, so I changed to process (len/8)*8bytes followed by
(len%8)*1bytes, the way the Linux kernel does.

-- Abhijit

Attachment Content-Type Size
0001-Implement-slice-by-8-CRC-calculation.patch text/x-diff 32.8 KB
0002-Use-the-SSE4.2-CRC-instructions-where-available.patch text/x-diff 7.0 KB

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