Tim Peters <t...@python.org> added the comment:

Gregory, care to take their code and time it against Python?

I'm not inclined to: reading the comments in the code, they're trying "fast 
paths" already described in papers by Clinger and - later - by Gay.  When those 
fast paths don't apply, they fall back on the system `strtod`. But Python's 
current implementation builds on Gay's fastest code (and never falls back to 
the system).

It's possible they "improved" on Gay by building relatively giant tables of 
static data.

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<https://bugs.python.org/issue41310>
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