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Re: Add error functions: erf() and erfc() - Mailing list pgsql-hackers

From Nathan Bossart
Subject Re: Add error functions: erf() and erfc()
Date
Msg-id 20230309001313.GA3622861@nathanxps13
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In response to Re: Add error functions: erf() and erfc()  (Dean Rasheed <dean.a.rasheed@gmail.com>)
Responses Re: Add error functions: erf() and erfc()  (Dean Rasheed <dean.a.rasheed@gmail.com>)
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On Wed, Mar 08, 2023 at 11:29:12PM +0000, Dean Rasheed wrote:
> On Wed, 8 Mar 2023 at 20:11, Nathan Bossart <nathandbossart@gmail.com> wrote:
>> The man pages for these seem to indicate that underflow can occur.  Do we
>> need to check for that?
> 
> No, I don't think so. The docs indicate that if an underflow occurs,
> the correct result (after rounding) should be returned, so I think we
> should just return that result (as we do for tanh(), for example).

Makes sense.

I'm also wondering about whether we need the isinf() checks.  IIUC that
should never happen, but maybe you added that "just in case."

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

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