[issue21955] ceval.c: implement fast path for integers with a single digit

[Antoine Pitrou]

Antoine Pitrou added the comment:

Le 04/02/2016 15:18, Yury Selivanov a écrit :
> 
> But it is faster. That's visible on many benchmarks. Even simple
timeit oneliners can show that. Probably it's because that such
benchmarks usually combine floats and ints, i.e. "2 * smth" instead of
"2.0 * smth".

So it's not about FP-related calculations anymore. It's about ints
having become slower ;-)

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