| From: | Florian Weimer <fweimer(at)bfk(dot)de> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>, "Robert Haas" <robertmhaas(at)gmail(dot)com>, "Thomas Munro" <munro(at)ip9(dot)org>, "Florian Pflug" <fgp(at)phlo(dot)org> |
| Subject: | Re: strict aliasing |
| Date: | 2011-11-15 10:45:22 |
| Message-ID: | 82r519wtod.fsf@mid.bfk.de |
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| Lists: | pgsql-hackers |
* Andres Freund:
> I don't gcc will ever be able to call all possible misusages. E.g. The
> List api is a case where its basically impossible to catch everything
> (as gcc won't be able to figure out what the ListCell.data.ptr_value
> pointed to originally in the general case).
Correct, if code is not strict-aliasing-safe and you compile with
-f-strict-aliasing, GCC may silently produce wrong code. (Same with
-fwrapv, by the way.)
--
Florian Weimer <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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