Mark Dickinson added the comment:
Refreshed patch, with a few minor updates:
- Use copysign instead of signbit (we don't currently check for signbit
in the configure scripts); only check for negative zero when we've
already checked equality with 0.0.
- Use Py_IS_NAN and Py_IS_INFINITY instead of isinf and isnan.
- Add an extra check for really tiny numbers in _PyFloat_Pack2 to avoid
binary64 subnormals in intermediate calculations.
- Remove a duplicate check for the case x == 0.0 in _PyFloat_Pack2.
- Make unpacking of ints and nans behave in the same way as float("inf") or
float("nan"): use _Py_dg_infinity and _Py_dg_stdnan if available, else fall
back to Py_HUGE_VAL and Py_NAN.
- Minor style nits (braces; use floating-point constants when comparing with
floats; consistent capitalization for hex literals, etc.)
----------
Added file: http://bugs.python.org/file30145/cpython-struct-float16-v6.patch
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<http://bugs.python.org/issue11734>
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