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bpo-29782: Consolidate _Py_Bit_Length() (GH-20739)

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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.
This commit is contained in:
Niklas Fiekas 2020-06-15 14:33:48 +02:00 • committed by GitHub
parent 25f38d7044
commit 794e7d1ab2
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6 changed files with 100 additions and 36 deletions
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Modules/mathmodule.c
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@ -53,6 +53,7 @@ raised for division by zero and mod by zero.
*/
#include "Python.h"
#include "pycore_bitutils.h" // _Py_bit_length()
#include "pycore_dtoa.h"
#include "_math.h"