Re: Parsing timestamps?

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Sujet : Re: Parsing timestamps?
De : no.email (at) *nospam* nospam.invalid (Paul Rubin)
Groupes : comp.lang.forth
Date : 10. Jul 2025, 20:33:52
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <87h5zjx2lb.fsf@nightsong.com>
References : 1 2 3 4 5 6 7 8 9 10
User-Agent : Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)
anton@mips.complang.tuwien.ac.at (Anton Ertl) writes:
I believes IEEE specifies both 80 bit and 128 bit formats in addition
to 64 bit.
Not 80-bit format.  binary128 and binary256 are specified.

I see, 80 bits is considered double-extended.  "The x87 and Motorola
68881 80-bit formats meet the requirements of the IEEE 754-1985 double
extended format,[12] as does the IEEE 754 128-bit binary format."
(https://en.wikipedia.org/wiki/Extended_precision)

Interestingly, Kahan's 1997 report on IEEE 754's status does say 80 bit
is specified.  But it sounds like that omits some nuance. 

https://people.eecs.berkeley.edu/~wkahan/ieee754status/IEEE754.PDF

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