[issue25106] Hash computation speedup for {buffer, string, unicode}object

[STINNER Victor]

STINNER Victor added the comment:

> Python 2.7 is closed for adding new features. Python 3.4+ uses different code for calculating hashes.

The code doesn't modify the hash function. It's a common loop unroll optimization technique.

Since the optimization can be seen on real world benchmark, I think that it's worth to take this optimization.

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nosy: +haypo
type: enhancement -> performance

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<http://bugs.python.org/issue25106>
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