[issue26289] Optimize floor division for ints

[Mark Dickinson]

Mark Dickinson added the comment:

A slightly neater way to compute the result in the case that the signs differ is 

  div = ~((left - 1) / right)

That saves the extra multiplication and equality check.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26289>
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