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py/binary: Support half-float 'e' format in struct pack/unpack.

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This commit implements the 'e' half-float format: 10-bit mantissa, 5-bit
exponent.  It uses native _Float16 if supported by the compiler, otherwise
uses custom bitshifting encoding/decoding routines.

Signed-off-by: Matthias Urlichs <matthias@urlichs.de>
Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Matthias Urlichs
2023-10-25 19:17:47 +02:00
committed by Damien George
parent 77f08b72ca
commit e520fa2e0f
4 changed files with 119 additions and 3 deletions
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docs/library/struct.rst
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@@ -45,6 +45,8 @@ The following data types are supported:
+--------+--------------------+-------------------+---------------+
| Q | unsigned long long | integer (`1<fn>`) | 8 |
+--------+--------------------+-------------------+---------------+
| e | n/a (half-float) | float (`2<fn>`) | 2 |
+--------+--------------------+-------------------+---------------+
| f | float | float (`2<fn>`) | 4 |
+--------+--------------------+-------------------+---------------+
| d | double | float (`2<fn>`) | 8 |