Re: 9.4 broken on alpha
| От | Thomas Munro |
|---|---|
| Тема | Re: 9.4 broken on alpha |
| Дата | |
| Msg-id | CAEepm=1NHkgoASTB9UBmaRBu-+460vC3EJ464puUWV3YYrcb6A@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: 9.4 broken on alpha (Tom Lane <tgl@sss.pgh.pa.us>) |
| Список | pgsql-hackers |
On Mon, Aug 31, 2015 at 8:42 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Just by the way, there is at least one example of a non-IEEE floating point format supported by a current production compiler and hardware: IBM XL C on z/OS (and possibly other platforms) can use either IEEE or IBM's hex float format, depending on a compiler option.
https://en.wikipedia.org/wiki/IBM_Floating_Point_Architecture
A useful comparison point is the testing Greg Stark did recently for VAX.
Certainly no-one's ever again going to try to get useful work done with
Postgres on a VAX, but that still taught us some good things about
unnecessary IEEE-floating-point dependencies that had snuck into the code.
Someday, that might be important; IEEE 754 won't be the last word on
float arithmetic forever.
Just by the way, there is at least one example of a non-IEEE floating point format supported by a current production compiler and hardware: IBM XL C on z/OS (and possibly other platforms) can use either IEEE or IBM's hex float format, depending on a compiler option.
https://en.wikipedia.org/wiki/IBM_Floating_Point_Architecture
Thomas Munro
http://www.enterprisedb.com
http://www.enterprisedb.com
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