[Cfp-interest 1929] Re: action item: suggest wording for hypot

[Paul Zimmermann]

       David,

with that change, is the value of hypot(NaN, +-0) specified somewhere?

Best regards,
Paul

> Date: Thu, 18 Feb 2021 18:07:33 -0800 (PST)
> From: David Hough CFP  <pcfp at oakapple.net>
> 
> 
> Draft C23 F.10.4.4 says
>  
> --- hypot(x, y), hypot(y, x), and hypot(x, -y) are equivalent.
> --- hypot(x, +-0) is equivalent to fabs(x).
> --- hypot(+-inf, y) returns +inf, even if y is a NaN.
> 
> Suggestion:
> 
> Change the middle bullet to:
> 
> --- hypot(x, +-0) returns the absolute value of x, when x is not a NaN
> 
> Note that "when x is not a NaN" is equivalent to "when x is a number".
> 
> But "when x is not a NaN" shows up twice in n2596, in F.10.10.1 for fma,
> and F.10.13.1 getpayload.
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