[issue24076] sum() several times slower on Python 3 64-bit

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

The patch looks fine, but it looks a bit like benchmark chasing. Is the speed of builtin sum() of a sequence of integers important enough to do this bit of inlining? (It may break if we change the internals of Py_Long, as Mark Shannon has been wanting to do for a while -- see https://github.com/faster-cpython/ideas/issues/42.)

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<https://bugs.python.org/issue24076>
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