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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: Parsing timestamps?
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dxf <dxforth@gmail.com> writes:
> As for SSE2 it wouldn't exist if industry didn't consider
> double-precision adequate.

SSE2 is/was first and foremost a vectorizing extension, and it has been
superseded quite a few times, indicating it was never all that
adequate.  I don't know whether any of its successors support extended
precision though.

W. Kahan was a big believer in extended precision (that's why the 8087
had it from the start).  I believes IEEE specifies both 80 bit and 128
bit formats in addition to 64 bit.  The RISC-V spec includes encodings
for 128 bit IEEE but I don't know if any RISC-V hardware actually
implements it.  I think there are some IBM mainframe CPUs that have it.