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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Ants Aasma <ants.aasma@eesti.ee>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: WIP: Faster Expression Processing v4
Date: Mon, 27 Mar 2017 13:30:11 -0400
Message-ID: <3607.1490635811@sss.pgh.pa.us> (raw)
In-Reply-To: <20170327163838.yqknegrntnuzvtta@alap3.anarazel.de>
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Andres Freund <andres@anarazel.de> writes:
> On 2017-03-27 12:18:37 -0400, Tom Lane wrote:
>> My feeling at this point is that we might be better off disabling
>> the computed-goto case by default.  At the very least, we're going
>> to need a version check that restricts it to latest gcc.

> In my measurements it's still faster in at least gcc-5/6, even without
> the option (largely because it avoids array bounds checks on the jump
> table built for the switch).

Hm.  What test cases are you using?

			regards, tom lane


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