| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Ants Aasma <ants(dot)aasma(at)eesti(dot)ee>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: WIP: Faster Expression Processing v4 |
| Date: | 2017-03-27 17:30:11 |
| Message-ID: | 3607.1490635811@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Andres Freund <andres(at)anarazel(dot)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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