From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Cc: andres@anarazel.de
Cc: thomas.munro@enterprisedb.com
Cc: andrew@tao11.riddles.org.uk
Cc: david.rowley@2ndquadrant.com
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: Using POPCNT and other advanced bit manipulation instructions
Date: Fri, 15 Feb 2019 11:36:15 -0500
Message-ID: <5213.1550248575@sss.pgh.pa.us> (raw)
In-Reply-To: <20190215161840.GA13026@alvherre.pgsql>
References: <20190215161840.GA13026@alvherre.pgsql>
Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> Here's a final version that I intend to push shortly, to have time
> before EOB today to handle any fallout.
I think this is likely to result in a lot of complaints about
rightmost_one_pos[] being unreferenced, in non-HAVE__BUILTIN_CTZ
builds. Probably that has to be an extern rather than static
in the header. leftmost_one_pos[] likewise.
I might have a go at improving the configure tests later ---
I still don't like that they're compile-time-optimizable.
But that can wait.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@2ndquadrant.com, horiguchi.kyotaro@lab.ntt.co.jp, andres@anarazel.de, thomas.munro@enterprisedb.com, andrew@tao11.riddles.org.uk, david.rowley@2ndquadrant.com, pgsql-hackers@lists.postgresql.org
Subject: Re: Using POPCNT and other advanced bit manipulation instructions
In-Reply-To: <5213.1550248575@sss.pgh.pa.us>
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