| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Some improvements to numeric sqrt() and ln() |
| Date: | 2020-03-01 19:47:29 |
| Message-ID: | CAEZATCVOMC6QpFehBM8oQBa8bx+P1ptWjefgN75iXUnc=jkEQw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, 28 Feb 2020 at 08:15, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> wrote:
>
> It's possible that there are further gains to be had in the sqrt()
> algorithm on platforms that support 128-bit integers, but I haven't
> had a chance to investigate that yet.
>
Rebased patch attached, now using 128-bit integers for part of
sqrt_var() on platforms that support them. This turned out to be well
worth it (1.5 to 2 times faster than the previous version if the
result has less than 30 or 40 digits).
Regards,
Dean
| Attachment | Content-Type | Size |
|---|---|---|
| numeric-sqrt-v2.patch | text/x-patch | 21.3 KB |
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