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Mention _Float16 (type from Annex H of the C23) in the struct docs #146243

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Mention _Float16 (type from Annex H of the C23) in the struct docs #146243

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Mention _Float16 (type from Annex H of the C23) in the struct docs
skirpichev Mar 21, 2026
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skirpichev Mar 21, 2026
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1 change: 1 addition & 0 deletions Doc/conf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -177,6 +177,7 @@
('c:type', '__int64'),
('c:type', 'unsigned __int64'),
('c:type', 'double'),
('c:type', '_Float16'),
# Standard C structures
('c:struct', 'in6_addr'),
('c:struct', 'in_addr'),
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6 changes: 4 additions & 2 deletions Doc/library/struct.rst
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Expand Up @@ -254,7 +254,7 @@ platform-dependent.
+--------+--------------------------+--------------------+----------------+------------+
| ``N`` | :c:type:`size_t` | integer | | \(3) |
+--------+--------------------------+--------------------+----------------+------------+
| ``e`` | \(6) | float | 2 | \(4) |
| ``e`` | :c:expr:`_Float16` | float | 2 | \(4), \(6) |
+--------+--------------------------+--------------------+----------------+------------+
| ``f`` | :c:expr:`float` | float | 4 | \(4) |
+--------+--------------------------+--------------------+----------------+------------+
Expand Down Expand Up @@ -322,7 +322,9 @@ Notes:
revision of the `IEEE 754 standard <ieee 754 standard_>`_. It has a sign
bit, a 5-bit exponent and 11-bit precision (with 10 bits explicitly stored),
and can represent numbers between approximately ``6.1e-05`` and ``6.5e+04``
at full precision. This type is not widely supported by C compilers: on a
at full precision. This type is not widely supported by C compilers:
it's available as :c:expr:`_Float16` type, if the compiler supports the Annex H
of the C23 standard. On a
typical machine, an unsigned short can be used for storage, but not for math
operations. See the Wikipedia page on the `half-precision floating-point
format <half precision format_>`_ for more information.
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