[issue21419] Use calloc() instead of malloc() for int << int (lshift)

[Josh Rosenberg]

Josh Rosenberg added the comment:

I swear, I need to refresh before I post a long comment.

If this is slowing everything down a little just to make 1 << (2 ** 29) faster (and did you really mean 1 << (1 << 29) ? :-) ), then I'd say drop it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21419>
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