Niklas Fiekas 794e7d1ab2 bpo-29782: Consolidate _Py_Bit_Length() (GH-20739) ...

In GH-2866, _Py_Bit_Length() was added to pymath.h for lack of a better
location. GH-20518 added a more appropriate header file for bit utilities. It
also shows how to properly use intrinsics. This allows reconsidering bpo-29782.

* Move the function to the new header.
* Changed return type to match __builtin_clzl() and reviewed usage.
* Use intrinsics where available.
* Pick a fallback implementation suitable for inlining.

2020-06-15 14:33:48 +02:00

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