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[mypyc] Add lowered primitive for unsafe list get item op #18136

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[mypyc] Add lowered primitive for unsafe list get item op #18136

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Commits on Nov 10, 2024

  1. [mypyc] Add lowered primitive for unsafe list get item op 

    This inlines the list get item op in loops like `for x in <list>`.

I estimated the impact using two microbenchmarks that iterate over
`list[int]` objects. One of them was 1.3x faster, while the other
was 1.09x faster.

Since we now generate detailed IR for the op, instead of using a
C primitive function, this also opens up further IR optimization
opportunities in the future.
    @JukkaL
    JukkaL committed Nov 10, 2024
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