This is probably known, but showed up when re-implementing sparse matrix algorithms. This helper is used in the first part of a sparse matmul. It’s considerably faster if we cast the indices to uint, as I suppose the compiler need not worry about wraparound for negative indices? import numba import…

Numba indexing faster with unsigned integers

nelson2005 January 20, 2026, 4:07pm 2

Right, that’s fairly well known. We just cast it in our code.

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