Re: MAXIMUM_ALIGNOF on Windows-32
От | Pavan Deolasee |
---|---|
Тема | Re: MAXIMUM_ALIGNOF on Windows-32 |
Дата | |
Msg-id | 2e78013d0707201042w22150b65o9a6add4956c77956@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: MAXIMUM_ALIGNOF on Windows-32 (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-hackers |
On 7/20/07, Tom Lane <tgl@sss.pgh.pa.us> wrote:
"Pavan Deolasee" <pavan.deolasee@gmail.com> writes:
> The MAXIMUM_ALIGNOF value is set to 8 bytes in a Windows- 32-bit
> environment. I have very little knowledge about Windows, but at
> the face of it, this looks strange. Any idea why is this required ?
It's not entirely unreasonable. The same thing happens on HPPA,
which is nominally a 32-bit architecture but the hardware requires
8-byte alignment of doubles (and maybe int64 too, I forget).
On newer Intel hardware it'd make sense to pad to avoid misaligned
fetches.
Anyway, we detect this directly based on the C compiler's behavior,
and you can't argue with the compiler about it. Whatever it's
doing is right by definition.
Ah, that makes sense. I was confusing myself with 64-bit architectures
and alignments.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB http://www.enterprisedb.com
В списке pgsql-hackers по дате отправления: