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Add an efficient popcount method for integers #74068

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@niklasf

Description

@niklasf
mannequin
Issue body actions
BPO 29882
Nosy @tim-one, @rhettinger, @mdickinson, @vstinner, @njsmith, @markshannon, @serhiy-storchaka, @vedgar, @DimitrisJim, @niklasf, @gbtami
PRs
  • bpo-29882: Add an efficient popcount method for integers #771
  • bpo-29882: Add _Py_popcount32() function #20518
  • bpo-29882: _Py_popcount32() doesn't need 64x64 multiply #30774
  • bpo-29882: Fix portability bug introduced in GH-30774 #30794
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
    closed_at = <Date 2020-05-29.16:28:39.179>
    created_at = <Date 2017-03-22.17:30:42.549>
    labels = ['interpreter-core', 'type-feature', '3.10']
    title = 'Add an efficient popcount method for integers'
    updated_at = <Date 2022-01-23.09:59:43.073>
    user = 'https://github.com/niklasf'

    bugs.python.org fields:

    activity = <Date 2022-01-23.09:59:43.073>
    actor = 'mark.dickinson'
    assignee = 'none'
    closed = True
    closed_date = <Date 2020-05-29.16:28:39.179>
    closer = 'mark.dickinson'
    components = ['Interpreter Core']
    creation = <Date 2017-03-22.17:30:42.549>
    creator = 'niklasf'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 29882
    keywords = []
    message_count = 26.0
    messages = ['290003', '290013', '290014', '290015', '290016', '290017', '290073', '344215', '344216', '344223', '344224', '344225', '369860', '369878', '369879', '369881', '369887', '369966', '370323', '370423', '370447', '370456', '370987', '372497', '411211', '411357']
    nosy_count = 12.0
    nosy_names = ['tim.peters', 'rhettinger', 'mark.dickinson', 'vstinner', 'casevh', 'njs', 'Mark.Shannon', 'serhiy.storchaka', 'veky', 'Jim Fasarakis-Hilliard', 'niklasf', 'gbtami']
    pr_nums = ['771', '20518', '30774', '30794']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'enhancement'
    url = 'https://bugs.python.org/issue29882'
    versions = ['Python 3.10']

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      3.10only security fixesonly security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-featureA feature request or enhancementA feature request or enhancement

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