Optimize type indirection visitor #18298
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This was a performance bottleneck when type checking torch. It used to perform lots of set unions and hash value calculations on mypy type objects, which are both pretty expensive. Now we mostly rely on set contains and set add operations with strings, which are much faster. We also avoid constructing many temporary objects. Speeds up type checking torch by about 3%. Also appears to speed up self check by about 2%.
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
hauntsaninja
approved these changes
Dec 17, 2024
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Nice! |
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This was a performance bottleneck when type checking torch. It used to perform lots of set unions and hash value calculations on mypy type objects, which are both pretty expensive. Now we mostly rely on set contains and set add operations with strings, which are much faster. We also avoid constructing many temporary objects.
Speeds up type checking torch by about 3%. Also appears to speed up self check by about 2%.