New submission from STINNER Victor: Attached patch modifies long_lshift() to allocate the result using calloc() instead of malloc(). The goal is to avoid allocating physical memory for the least significat digits (zeros). According to my tests in issue #21233 (calloc), Linux and Windows have an optimized calloc() functions and at least Linux avoids allocating memory for pages initialized by zeros until pages at modified.
---------- files: long_lshift.patch keywords: patch messages: 217787 nosy: haypo, pitrou priority: normal severity: normal status: open title: Use calloc() instead of malloc() for int << int (lshift) type: performance versions: Python 3.5 Added file: http://bugs.python.org/file35135/long_lshift.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue21419> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
