Static typing [was Re: Python and the need for speed]

Gregory Ewing greg.ewing at canterbury.ac.nz
Tue Apr 18 01:43:22 EDT 2017


Steve D'Aprano wrote:
> I'm not sure why the Cython devs maintain this is not a JIT compiler.
> Perhaps I misunderstand something.

A JIT compiler works by observing the actual values taken on
by variables at run time, and if it notices that a particular
variable seems to always have a particular type, it compiles
a special version of the code to handle that type, protected
by appropriate guards.

Cython doesn't do any of that -- it's just a plain, boring,
standard ahead-of-time compiler that goes by the type info
you give it and nothing more.

-- 
Greg


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