| 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 |
| Message-ID: | 20150101071723.GA17300@toroid.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi.
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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