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Jordan

Lazyweb: why does NaN have a sign bit? Why wasn’t that the quiet/signaling bit?

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Steve Canon

@jrose because then copysign/abs/negate could produce a sNaN result from qNaN input, contra clause 5 norms.

(Or else wouldn’t just be bitwise ops, also undesirable)

Cassandrich

@steve @jrose This. 👆

Better question: why does sNaN exist? 🙃

Feb 22, 2025, 01:31 AM·Public·Web
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Steve Canon

@dalias @jrose because velvel wanted to use it for debugging purposes, roughly

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mx alex tax1a - 2020 (5)

@dalias @steve @jrose so you could trap on the first exception and set it to quiet and run through the rest of the calculation without trapping

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Cassandrich

@atax1a @steve @jrose Yeah but trapping is such a stupid behavior (not even supported by standard interfaces) to begin with.

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mx alex tax1a - 2020 (5)

@dalias @steve @jrose yeah don't mind us we've just been basting our brain with a bunch of pre-754 IBM manuals

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Cassandrich

@atax1a @steve @jrose Clearly the drug of choice for these times.

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