| From: | Gregory Stark <stark(at)enterprisedb(dot)com> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Fixed length data types issue |
| Date: | 2006-09-07 12:11:49 |
| Message-ID: | 877j0fdgfu.fsf@enterprisedb.com |
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| Lists: | pgsql-hackers |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> The fundamental property of a Datum is that you can pass it by value to
> a C function. This generally means it has to fit in a register. On the
> whole, the CPU register size is the same as the pointer size, so
> 2*sizeof(pointer) is unlikely to fit...
Not having it fit in a register might impact performance but it certainly
isn't a requirement. You can pass whole structs by value in modern C. (And by
modern here I don't mean C99, this has been supported since before ANSI and is
required by *C89*).
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
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