[Cfp-interest 1806] Re: Exact subnormal results

[Jim Thomas]

> On Oct 21, 2020, at 6:53 AM, David Hough CFP <pcfp at oakapple.net> wrote:
> 
>>> The second case means that underflow can't be detected just by looking 
>>> for a subnormal or zero result. Worse, in binary, a minimum normalized 
>>> result handled by default might be accompanied by an underflow flag in 
>>> some implementations and not others.
> 
>> Can you point me somewhere I can read a bit more on the above?
> 
> https://754r.ucbtest.org/background/exceptions.txt
> 
> 
> Unfortunately 754 default underflow handling doesn't make a lot of sense
> without the context of alternate exception handling, which C so far avoided.

There is C support for alternate exception handling in TS5:

https://wiki.edg.com/pub/CFP/WebHome/ISO_IEC_TS_18661-5_2016-Character_PDF_document_en.pdf <https://wiki.edg.com/pub/CFP/WebHome/ISO_IEC_TS_18661-5_2016-Character_PDF_document_en.pdf>

> 
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