bpo-29782: Consolidate _Py_Bit_Length()#20739

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niklasf:bpo-29782-msb

Jun 15, 2020

Commits on Jun 8, 2020

bpo-29782: Consolidate _Py_Bit_Length()
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281009c
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Specify required gcc version for __builtin_clzl
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65abb83
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Fix _BitScanReverse usage
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ce45ff2
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Document reason for include
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6464ca6
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Ensure future compatibility
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Do not try to support GCC < 3.4
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Coding style
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436f68b
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Fix comment indent
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ac664bc
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Do not factor out x != 0
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3279d17
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Fix and move _Py_bit_length_digit()
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525da3d
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Add unit test for _Py_bit_length()
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e487622
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Remove useless cast in test
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a338761
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Use original implementation as fallback
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5a146f7
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Re-enable intrinsics
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8e3ce66
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Explicitly cast sizeof
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Better tests
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Explain Py_BUILD_ASSERT(sizeof(unsigned long) <= 4)
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dfceaf2
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Use volatile so test actually runs intrinsic
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Remove trailing spaces
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_Py_bit_length_digit -> bit_length_digit
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462d995
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Fixup test expectations
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bpo-29782: Consolidate _Py_Bit_Length()#20739

bpo-29782: Consolidate _Py_Bit_Length()#20739
vstinner merged 21 commits intopython:masterpython/cpython:masterfrom
niklasf:bpo-29782-msbniklasf/cpython:bpo-29782-msbCopy head branch name to clipboard

Commits on Jun 8, 2020

bpo-29782: Consolidate _Py_Bit_Length()

Specify required gcc version for __builtin_clzl

Fix _BitScanReverse usage

Document reason for include

Ensure future compatibility

Do not try to support GCC < 3.4

Coding style

Fix comment indent

Do not factor out x != 0

Fix and move _Py_bit_length_digit()

Add unit test for _Py_bit_length()

Remove useless cast in test

Use original implementation as fallback

Re-enable intrinsics

Explicitly cast sizeof

Better tests

Explain Py_BUILD_ASSERT(sizeof(unsigned long) <= 4)

Use volatile so test actually runs intrinsic

Remove trailing spaces

_Py_bit_length_digit -> bit_length_digit

Fixup test expectations

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Commits on Jun 8, 2020