Re: WIP: Faster Expression Processing v4 - Mailing list pgsql-hackers

From Tom Lane
Subject Re: WIP: Faster Expression Processing v4
Date
Msg-id 3607.1490635811@sss.pgh.pa.us
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In response to Re: WIP: Faster Expression Processing v4  (Andres Freund <andres@anarazel.de>)
Responses Re: WIP: Faster Expression Processing v4  (Andres Freund <andres@anarazel.de>)
List pgsql-hackers
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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