| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Reducing the runtime of the core regression tests |
| Date: | 2019-04-12 17:57:22 |
| Message-ID: | CAH2-WznfrRufPbgC-3ZBknG25i+Bq1zFkLTWruz+PVGY0_JSvw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Apr 12, 2019 at 10:49 AM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> It's definitely generally recommended that "-O0" be used, so I think
> that we can agree that that was an improvement, even if it doesn't fix
> the remaining problem that I noticed when I rechecked nbtutils.c.
I'm not sure that we can really assume that "-O0" avoids the behavior
I pointed out. Perhaps this counts as "semantic flattening" or
something, rather than an optimization. I could have easily written
the code in _bt_keep_natts_fast() in the way gcov/gcc/whatever thinks
I ought to have, which would have obscured the distinction anyway.
--
Peter Geoghegan
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