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Re: Using POPCNT and other advanced bit manipulation instructions - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Using POPCNT and other advanced bit manipulation instructions
Date
Msg-id 20190213205904.GA13925@alvherre.pgsql
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In response to Re: Using POPCNT and other advanced bit manipulation instructions  (Andrew Gierth <andrew@tao11.riddles.org.uk>)
Responses Re: Using POPCNT and other advanced bit manipulation instructions  (Andrew Gierth <andrew@tao11.riddles.org.uk>)
Re: Using POPCNT and other advanced bit manipulation instructions  (Alvaro Herrera <alvherre@2ndquadrant.com>)
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On 2019-Feb-13, Andrew Gierth wrote:

> >>>>> "Alvaro" == Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> 
>  Alvaro> I've pushed this now. Let's see what the buildfarm has to say
>  Alvaro> about it.
> 
> Lapwing's latest failure looks like yours rather than mine now? (the
> previous two were mine)

It definitely is ... plans have changed from using IndexOnly scans to
Seqscans, which is likely fallout from the visibilitymap_count() change.
Looking.

(I patched the Makefile to add -mpopcnt to all the compile lines rather
than just the frontend one, but I can't see that explaining the
failure.)

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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