[issue14654] Faster utf-8 decoding

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

Well, it seems, 64-bit processors are smart enough to not feel the need
for this optimization. On 32-bit platforms I see a noticeable increase
in speed.

I am now working on a more advanced optimization, which now shows a gain
of +20-60% compared with the previous patches, but I hope to increase a
gain by +50%-100%.

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