exp() versus the POSIX standard

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От
Tom Lane
Тема
exp() versus the POSIX standard
Дата
Msg-id
582552.1591917752@sss.pgh.pa.us
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exp() versus the POSIX standard Tom Lane <tgl@sss.pgh.pa.us>
Re: exp() versus the POSIX standard Tom Lane <tgl@sss.pgh.pa.us>
Re: exp() versus the POSIX standard Darafei "Komяpa" Praliaskouski <me@komzpa.net>
Re: exp() versus the POSIX standard Tom Lane <tgl@sss.pgh.pa.us>
Re: exp() versus the POSIX standard Darafei "Komяpa" Praliaskouski <me@komzpa.net>
Re: exp() versus the POSIX standard Emre Hasegeli <emre@hasegeli.com>
Re: exp() versus the POSIX standard Tom Lane <tgl@sss.pgh.pa.us>
Re: exp() versus the POSIX standard Emre Hasegeli <emre@hasegeli.com> 
The POSIX standard says this about the exp(3) function:

	If x is -Inf, +0 shall be returned.

At least on my Linux box, our version does no such thing:

regression=# select exp('-inf'::float8);
ERROR:  value out of range: underflow

Does anyone disagree that that's a bug?  Should we back-patch
a fix, or just change it in HEAD?  Given the lack of user
complaints, I lean a bit towards the latter, but am not sure.

			regards, tom lane
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