| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | Vladimir Sitnikov <sitnikov(dot)vladimir(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu> |
| Subject: | Re: speed up verifying UTF-8 |
| Date: | 2021-08-04 11:22:57 |
| Message-ID: | CAFBsxsFaXOgdqnHmXb91mK0_q=-vn4Mt61KVDww2y5=BHK3XFQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
I wrote:
> If we have only 16 bytes in the input, it still seems to be faster to use
SSE, even though it's called through a function pointer on x86. I didn't
test the DFA path, but I don't think the conclusion would be different.
I'll include the 16 threshold next time I need to update the patch.
v22 attached, which changes the threshold to 16, with a few other cosmetic
adjustments, mostly in the comments.
--
John Naylor
EDB: http://www.enterprisedb.com
| Attachment | Content-Type | Size |
|---|---|---|
| v22-0001-Add-fast-paths-for-validating-UTF-8-text.patch | application/octet-stream | 63.8 KB |
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