Re: Reduction operations in P1788/D9.5
Lundi 12 Janvier 2015 à 03:43:41 +0100, Vincent Lefèvre a écrit:
> On 2015-01-11 09:07:43 -0500, Michel Hack wrote:
> > Note that there are few genuine error cases in 754 -- the only one
> > that comes to mind (besides SNaN conversion) is sqrt() of a negative
> > argument.
>
> What do you mean?
You left out the explanation:
>> The "indefinite forms" 0/0 or Inf-Inf can in many contexts
>> be interpreted as B, because the zero or Inf may have been "impure",
>> i.e. the result of underflow or overflow.
Those are the other ways of generating a QNaN.
This was in the context of John Pryce's
| ... Of several views of NaN at Level 1, two are
| A. NaN is the result of a previous error.
| B. NaN stands for an unknown number, finite or infinite.
Michel.
---Sent: 2015-01-12 02:53:16 UTC