| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [POC] verifying UTF-8 using SIMD instructions |
| Date: | 2021-02-07 20:24:16 |
| Message-ID: | CAFBsxsHWAy+GS39rEbsczLb-3H1=P_93urv-85K0R7dUQfajwQ@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Here is a more polished version of the function pointer approach, now
adapted to all multibyte encodings. Using the not-yet-committed tests from
[1], I found a thinko bug that resulted in the test for nul bytes to not
only be wrong, but probably also elided by the compiler. Doing it correctly
is noticeably slower on pure ascii, but still several times faster than
before, so the conclusions haven't changed any. I'll run full measurements
later this week, but I'll share the patch now for review.
[1]
https://www.postgresql.org/message-id/11d39e63-b80a-5f8d-8043-fff04201fadc@iki.fi
--
John Naylor
EDB: http://www.enterprisedb.com
| Attachment | Content-Type | Size |
|---|---|---|
| v1-0001-Add-an-ASCII-fast-path-to-multibyte-encoding-veri.patch | application/octet-stream | 7.6 KB |
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