[Cfp-interest] AI about C support for "snan" character sequences

[Jim Thomas]

> On Oct 10, 2018, at 12:08 AM, Mike Cowlishaw <mfc at speleotrove.com> wrote:
> 
> 
>  
>>>     All: Consider the fact that C doesn't support the SNaN sequence that IEEE does. Can have strtod take it as input.
>>> <!--[endif]-->
>> 
>> 
>> IEEE 754 5.12.1 says
>> 
>>> Conversion of an external character sequence “snan” (regardless of case) with an optional preceding sign, to a supported format should either produce a signaling NaN or else produce a quiet NaN and signal the invalid operation exception.
>>> 
>> I think as written it is a recommendation to do one or the other, but not a requirement to do either. Is this what the 754 committee intended?
>>  
> I believe it was ...that's the first use of Should in that subclause.
>  
> Mike

That would mean C FP does not need to recognize “snan” character sequences in order to support 754.

Jim Thomas
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