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Too aggressive constant folding #65273

@methane

Description

@methane
BPO 21074
Nosy @ncoghlan, @vstinner, @benjaminp, @alex, @methane, @serhiy-storchaka, @eryksun
PRs
  • bpo-30416: Protect the optimizer during constant folding. #4860
  • [3.6] bpo-30416: Protect the optimizer during constant folding. #4865
  • [2.7] bpo-30416: Protect the optimizer during constant folding. (GH-4865) #4896
  • Superseder
  • bpo-30416: constant folding opens compiler to quadratic time hashing
  • 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 2019-03-03.14:33:28.122>
    created_at = <Date 2014-03-27.02:26:36.519>
    labels = ['interpreter-core', 'performance']
    title = 'Too aggressive constant folding'
    updated_at = <Date 2019-03-03.14:33:28.121>
    user = 'https://github.com/methane'

    bugs.python.org fields:

    activity = <Date 2019-03-03.14:33:28.121>
    actor = 'serhiy.storchaka'
    assignee = 'none'
    closed = True
    closed_date = <Date 2019-03-03.14:33:28.122>
    closer = 'serhiy.storchaka'
    components = ['Interpreter Core']
    creation = <Date 2014-03-27.02:26:36.519>
    creator = 'methane'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 21074
    keywords = ['patch']
    message_count = 25.0
    messages = ['214928', '214932', '214934', '214941', '214953', '215021', '215023', '215030', '215035', '215080', '215082', '215170', '215174', '215214', '294119', '294123', '294157', '294184', '294211', '294231', '294258', '294259', '308385', '308387', '337031']
    nosy_count = 9.0
    nosy_names = ['holdenweb', 'dalke', 'ncoghlan', 'vstinner', 'benjamin.peterson', 'alex', 'methane', 'serhiy.storchaka', 'eryksun']
    pr_nums = ['4860', '4865', '4896']
    priority = 'low'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = '30416'
    type = 'resource usage'
    url = 'https://bugs.python.org/issue21074'
    versions = ['Python 3.4', 'Python 3.5']

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      interpreter-core(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usage

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