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Subnormal instead of denormal #1017

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jfbastien opened this issue Nov 13, 2016 · 5 comments
Closed

Subnormal instead of denormal #1017

jfbastien opened this issue Nov 13, 2016 · 5 comments

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@jfbastien
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As a follow-up to #1009: IEEE-754 2008 uses "subnormal" instead of "denormal". Since C++ refers to the 2008 version, we should use the same naming.

See its section 2.1.51 for the definition. See 2.1.15 for "denormalized number: See: subnormal number."
@jensmaurer
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Is there a copy of IEEE-754 2008 available somewhere so that I can verify the claims?

@jfbastien
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@jensmaurer http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4610935

@jfbastien
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jfbastien commented Dec 8, 2016 •
edited

It's probably worth having an index entry for "denormal" still, which refers to subnormal. I'm not sure what to do about the traits though! Create a new one named subnormal, duplicating the original one?

@sigfpe
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sigfpe commented Dec 8, 2016 via email

@jfbastien
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@sigfpe any new trait needs to be in a paper and isn't editorial. The wording of the standard, however, should be editorially updated to reflect the new reference to the 2008 version of IEEE-754.

jensmaurer added a commit to jensmaurer/draft that referenced this issue Dec 9, 2016
@jensmaurer
[limits] Use 'subnormal number' as defined by IEEE 754-2008 = ISO 60559.
cbf0db3 
Also add index entries for 'denormalized value' and 'value,
denormalized', pointing to 'number, subnormal'.

Fixes cplusplus#1017.
@jensmaurer jensmaurer mentioned this issue Dec 9, 2016
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zygoloid pushed a commit that referenced this issue Dec 9, 2016
@jensmaurer @zygoloid
[limits] Use 'subnormal number' as defined by IEEE 754-2008 = ISO 605…
faaf054 
…59. (#1203)

Also add index entries for 'denormalized value' and 'value,
denormalized', pointing to 'number, subnormal'.

Fixes #1017.
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@jfbastien @sigfpe @jensmaurer